J/MNRAS/508/4249 TPA radio pulsars with MeerKAT (Posselt+, 2021)
The Thousand-Pulsar-Array programme on MeerKAT.
VI. Pulse widths of a large and diverse sample of radio pulsars.
Posselt B., Karastergiou A., Johnston S., Parthasarathy A., Keith M.J.,
Oswald L.S., Song X., Weltevrede P., Barr E.D., Buchner S., Geyer M.,
Kramer M., Reardon D.J., Serylak M., Shannon R.M., Spiewak R.,
Venkatraman Krishnan V.
<Mon. Not. R. Astron. Soc. 508, 4249-4268 (2021)>
=2021MNRAS.508.4249P 2021MNRAS.508.4249P (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Pulsars ; Radio sources ; Spectroscopy
Keywords: surveys; pulsars: general - radio continuum: stars
Abstract:
We present pulse width measurements for a sample of radio pulsars
observed with the MeerKAT telescope as part of the
Thousand-Pulsar-Array (TPA) programme in the MeerTime project. For a
centre frequency of 1284 MHz, we obtain 762 W10 measurements across
the total bandwidth of 775 MHz, where W10 is the width at the 10 per
cent level of the pulse peak. We also measure about 400 W10 values
in each of the four or eight frequency sub-bands. Assuming, the width
is a function of the rotation period P, this relationship can be
described with a power law with power law index µ = -0.29 ± 0.03.
However, using orthogonal distance regression, we determine a steeper
power law with µ = -0.63 ± 0.06. A density plot of the
period-width data reveals such a fit to align well with the contours
of highest density. Building on a previous population synthesis model,
we obtain population-based estimates of the obliquity of the magnetic
axis with respect to the rotation axis for our pulsars. Investigating
the width changes over frequency, we unambiguously identify a group of
pulsars that have width broadening at higher frequencies. The measured
width changes show a monotonic behaviour with frequency for the whole
TPA pulsar population, whether the pulses are becoming narrower or
broader with increasing frequency. We exclude a sensitivity bias,
scattering and noticeable differences in the pulse component numbers
as explanations for these width changes, and attempt an explanation
using a qualitative model of five contributing Gaussian pulse
components with flux density spectra that depend on their rotational
phase.
Description:
Here, we present measurements of a homogeneous large sample of pulse
widths from the Thousand-Pulsar-Array (TPA) programme (Johnston et al.
2020MNRAS.493.3608J 2020MNRAS.493.3608J) on the MeerKAT telescope. We concentrate on a
population-wide interpretation of these measurements and also study
their frequency dependence within the bandwidth of the MeerKAT L-Band
receiver centred at a frequency of 1284 MHz with a bandwidth of
775 MHz, a 64-dish radio interferometer. MeerKAT is located in the
Karoo region of South Africa and is operated by the South African
Radio Astronomy Observatory (SARAO). Bailes et al.
(2020PASA...37...28B 2020PASA...37...28B) presented in detail the instrumentation of
MeerKAT for pulsar observations. Overall 1274 unique pulsars were
observed between 2019 March 8 and 2020 October 30 (6277 individual
observations), partly during the commissioning phase of the MeerKAT
telescope, (i.e see the section 2 Observations). We proceed to data
analysis (i.e sections 3.1 Data reduction and 3.2 Width measurements)
to obtain pulse profile widths 1208 TPA pulsars as showed in the
table1.dat.
Next, in order to obtain the power law fit the rotation period and the
width W10, we measured this width in several sub-frequency bands of
the MeerKat channel 4 and 8, we organized measure results in the two
tables table24.dat and table28.dat for the channel 4 and 8
respectively. Contrast and colours values are also available in these
tables, (i.e see the section 4 Results, section 4.4 Width colours and
contrasts).
Finally, as explained in the section 4.3 Geometry constraints based on
the population statistics, We use the simulation data set by Johnston
and Karastergiou (2019MNRAS.485..640J 2019MNRAS.485..640J) to obtain estimates of the obliquity
angles α for each pulsar based on its known period and measured W10.
Results are available the the tablec1.dat.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 142 1208 Pulse profile widths as measured for the
frequency-averaged data of 1208 TPA pulsars
table24.dat 419 785 Pulse width measurements for the pulsars data
in the individual frequency sub-bands of the
channel 4
table28.dat 1435 702 Pulse width measurements for the pulsars data
in the individual frequency sub-bands of the
channel 8
tablec1.dat 32 762 Population-based obliquity angle estimates for
the 762 TPA pulsars
--------------------------------------------------------------------------------
See also:
J/ApJ/874/64 : 5GHz TMRT observations of 71 pulsars (Zhao+, 2019)
J/A+A/586/A92 : Pulse profiles of 100 radio pulsars (Pilia+, 2016)
J/ApJ/892/76 : The GBNCC pulsar survey. V. Pulsar census (McEwen+, 2020)
J/MNRAS/489/1543 : Arecibo polarimetric single-pulse survey (Olszanski+, 2019)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- PSR Pulsar name (PSRJ)
13- 18 F6.4 s P Pulsar's rotation period (P)
20- 25 F6.1 pc/cm3 DM Pulsar dispersion measure (DM)
27- 29 F3.1 --- IPflag ? Interpulses flag indicator (IPflag) (G1)
31 I1 --- Component Major or minor intensity peak flag
(Component) (G2)
33- 35 F3.1 --- Sflag ? Scattered pulsars flag (Sflag) (1)
37- 42 F6.2 deg W50 ? Measured pulse width at 50 per cent of the
pulse profile peak (W50) (G3)
44- 49 F6.2 deg E_W50 ? Positive uncertainty of W50
(σ+W50) (G4)
51- 57 F7.2 deg e_W50 ? Negative uncertainty of W50
(σ-W50) (G4)
59- 61 F3.1 --- W50Gflag ? Selected W50 measurement based on our
criteria flag (W50Gflag) (G5)
63- 68 F6.2 deg W10 ? Measured pulse width at 10 per cent of the
pulse profile peak (W10) (G3)
70- 74 F5.2 deg E_W10 ? Positive uncertainty of W10
(σ+W10) (G4)
76- 82 F7.2 deg e_W10 ? Negative uncertainty of W10
(σ-W10) (G4)
84- 89 F6.2 deg W10Err ? Chosen uncertainty of W10 to be
the symmetric error (G6)
91- 93 F3.1 --- W10Gflag ? Selected W10 measurement based on our
criteria flag (W10Gflag) (G5)
95-100 F6.2 deg W5 ? Measured pulse width at 5 per cent of the
pulse profile peak (W5) (G3)
102-107 F6.2 deg E_W5 ? Positive uncertainty of W5
(σ+W5) (G4)
109-114 F6.2 deg e_W5 ? Negative uncertainty of W5
(σ-W5) (G4)
116-118 F3.1 --- W5Gflag ? Selected W5 measurement based on
our criteria flag (W5Gflag) (G5)
120-125 F6.2 deg W1 ? Measured pulse width at 1 per cent of the
pulse profile peak (W1) (G3)
127-131 F5.2 deg E_W1 ? Positive uncertainty of W1
(σ+W1) (G4)
133-138 F6.2 deg e_W1 ? Negative uncertainty of W1
(σ-W1) (G4)
140-142 F3.1 --- W1Gflag ? Selected W1 measurement based on our
criteria flag (W1Gflag) (G5)
--------------------------------------------------------------------------------
Note (1): The Sflag (True if it is 1) indicates scattered pulsars from the
list of Oswald et al. (2021MNRAS.504.1115O 2021MNRAS.504.1115O).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table24.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- PSR Pulsar name (PSRJ)
13- 15 F3.1 --- IPflag ? Interpulses flag indicator (IPflag) (G1)
17 I1 --- Component Major or minor intensity peak flag
(Component) (G2)
19- 24 F6.1 MHz freq1 Central frequency in sub-band 1 (freq1) (1)
26- 31 F6.2 deg W10-1 ? Measured pulse width for the first
frequency sub-band at 10 per cent of the
pulse profile peak (W101) (G3)
33- 38 F6.2 deg E_W10-1 ? Positive uncertainty of W10-1
(σ+W10-1) (G4)
40- 45 F6.2 deg e_W10-1 ? Negative uncertainty of W10-1
(σ-W10-1) (G4)
47- 52 F6.2 deg W10-1Err ? Chosen uncertainty of W10-1 to be the
symmetric error (uncW101) (G6)
54- 56 F3.1 --- f_W10-1 ? Selected W101 measurement based on our
criteria flag (W10Gflag1) (G5)
58- 63 F6.1 MHz freq2 Central frequency in sub-band 2 (freq2) (2)
65- 70 F6.2 deg W10-2 ? Measured pulse width for the second
frequency sub-band at 10 per cent of the
pulse profile peak (W102) (G3)
72- 76 F5.2 deg E_W10-2 ? Positive uncertainty of W10-2
(σ+W10-2) (G4)
78- 83 F6.2 deg e_W10-2 ? Negative uncertainty of W10-2
(σ-W10-2) (G4)
85- 89 F5.2 deg W10-2Err ? Chosen uncertainty of W10-2 to be
the symmetric error (uncW102) (G6)
91- 93 F3.1 --- f_W10-2 ? Selected W102 measurement based on
our criteria flag (W10Gflag2) (G5)
95-100 F6.1 MHz freq3 Central frequency in sub-band 3 (freq3) (3)
102-107 F6.2 deg W10-3 ? Measured pulse width for the third frequency
sub-band at 10 per cent of the pulse profile
peak (W103) (G3)
109-114 F6.2 deg E_W10-3 ? Positive uncertainty of W10-3
(σ+W10-3) (G4)
116-121 F6.2 deg e_W10-3 ? Negative uncertainty of W_10-3
(σ-W10-3) (G4)
123-128 F6.2 deg W10-3Err ? Chosen uncertainty of W10-3 to be the
symmetric error (uncW103) (G6)
130-132 F3.1 --- f_W10-3 ? Selected W103 measurement based on our
criteria flag (W10Gflag3) (G5)
134-139 F6.1 MHz freq4 Central frequency in sub-band 4 (freq4) (4)
141-146 F6.2 deg W10-4 ? Measured pulse width for the fourth
frequency sub-band at 10 per cent of the
pulse profile peak (W104) (G3)
148-153 F6.2 deg E_W10-4 ? Positive uncertainty of W10-4
(σ+W10-4) (G4)
155-160 F6.2 deg e_W10-4 ? Negative uncertainty of W_10-4
(σ-W10-4) (G4)
162-167 F6.2 deg W10-4Err ? Chosen uncertainty of W10-4 to be
the symmetric error (uncW104) (G6)
169-171 F3.1 --- f_W10-4 ? Selected W104 measurement based on
our criteria flag (W10Gflag4) (G5)
173-178 F6.2 deg C43 ? Width colour C43 (ColW1043) (G7)
180-185 F6.2 deg C43Err ? Chosen uncertainty of C43 to be
the symmetric error (uncColW1043) (G8)
187-192 F6.2 deg E_C43 ? Positive uncertainty of C43
(σ+C43) (G8)
194-198 F5.2 deg e_C43 ? Negative uncertainty of C43
(σ-C43) (G8)
200-206 F7.4 --- K43 ? Width contrast K43 (KonW1043) (G7)
208-214 F7.4 --- e_K43 ? Chosen uncertainty of K43
(uncKonW1043) (G8)
216-221 F6.2 deg C42 ? Width colour C42 (ColW1042) (G7)
223-228 F6.2 deg C42Err ? Chosen uncertainty of C42 to be
the symmetric error (uncColW1042) (G8)
230-235 F6.2 deg E_C42 ? Positive uncertainty of C42
(σ+C42) (G8)
237-241 F5.2 deg e_C42 ? Negative uncertainty of C42
(σ-C42) (G8)
243-249 F7.4 --- K42 ? Width contrast K42 (KonW1042) (G7)
251-257 F7.4 --- e_K42 ? Chosen uncertainty of K42
(uncKonW1042) (G8)
259-264 F6.2 deg C41 ? Width colour C41 (ColW1041) (G7)
266-271 F6.2 deg C41Err ? Chosen uncertainty of C41 to be
the symmetric error (uncColW1041) (G8)
273-278 F6.2 deg E_C41 ? Positive uncertainty of C41
(σ+C41) (G8)
280-284 F5.2 deg e_C41 ? Negative uncertainty of C41
(σ-C41) (G8)
286-292 F7.4 --- K41 ? Width contrast K41 (KonW1041) (G7)
294-300 F7.4 --- e_K41 ? Chosen uncertainty of K41
(uncKonW1041) (G8)
302-307 F6.2 deg C32 ? Width colour C32 (ColW1032) (G7)
309-313 F5.2 deg C32Err ? Chosen uncertainty of C32 to be
the symmetric error (uncColW1032) (G8)
315-319 F5.2 deg E_C32 ? Positive uncertainty of C32
(σ+C32) (G8)
321-324 F4.2 deg e_C32 ? Negative uncertainty of C32
(σ-C32) (G8)
326-332 F7.4 --- K32 ? Width contrast K32 (KonW1032) (G7)
334-339 F6.4 --- e_K32 ? Chosen uncertainty of K32
(uncKonW1042) (G8)
341-346 F6.2 deg C31 ? Width colour C31 (ColW1031) (G7)
348-352 F5.2 deg C31Err ? Chosen uncertainty of C31 to be
the symmetric error (uncColW1031) (G8)
354-358 F5.2 deg E_C31 ? Positive uncertainty of C31
(σ+C31) (G8)
360-364 F5.2 deg e_C31 ? Negative uncertainty of C31
(σ-C31) (G8)
366-372 F7.4 --- K31 ? Width contrast K31 (KonW1031) (G7)
374-379 F6.4 --- e_K31 ? Chosen uncertainty of K31
(uncKonW1031) (G8)
381-386 F6.2 deg C21 ? Width colour C21 (ColW1021) (G7)
388-392 F5.2 deg C21Err ? Chosen uncertainty of C21 to be
the symmetric error (uncColW1021) (G8)
394-398 F5.2 deg E_C21 ? Positive uncertainty of C21
(σ+C21) (G8)
400-404 F5.2 deg e_C21 ? Negative uncertainty of C21
(σ-C21) (G8)
406-412 F7.4 --- K21 ? Width contrast K21 (KonW1021) (G7)
414-419 F6.4 --- e_K21 ? Chosen uncertainty of K21
(uncKonW1021) (G8)
--------------------------------------------------------------------------------
Note (1): For the first central frequency :
frequency : min = 987.8 MHz max = 1009.4 MHz mean = 995.817 MHz
Band-width = 194 MHz
wavelength : min = 29.71cm max = 30.37 cm mean = 30.14 cm
bandwidth = (27.45 cm - 33.37 cm)
Note (2): For the second central frequency :
frequency : min = 1138.1 MHz max = 1203.6 MHz mean = 1178.19 MHz
Band-width = 194 MHz
wavelength : min = 24.87 cm max = 26.36 cm mean = 25.47 cm
band-width = (23.49 cm - 27.74 cm)
Note (3): For the third central frequency :
frequency : min = 1378.8 MHz max = 1389.5 MHz mean = 1381.74 MHz
Band-width = 194 MHz
wavelength : min = 21.57 cm max = 21.78 cm mean = 21.71 cm
band-width = (20.29 cm - 23.35 cm)
Note (4): For the fourth central frequency :
frequency : min = 1570.3 MHz max = 1590.3 MHz mean = 1575.63 MHz
Band-width = 194 MHz
wavelength : min = 18.85 cm max = 19.09 cm mean = 19.03 cm
band-width = (17.95 cm - 20.29 cm)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table28.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- PSR Pulsar name (PSRJ)
13- 15 F3.1 --- IPflag ? Interpulses flag indicator (IPflag) (G1)
17 I1 --- Comp Major or minor intensity peak flag
(Component) (G2)
19- 23 F5.1 MHz freq1 Central frequency in sub-band 1 (freq1) (1)
25- 30 F6.2 deg W10-1 ? Measured pulse width for the first
frequency sub-band at 10 per cent of the
pulse profile peak (W101) (G3)
32- 36 F5.2 deg E_W10-1 ? Positive uncertainty of W10-1
(σ+W10-1) (G4)
38- 43 F6.2 deg e_W10-1 ? Negative uncertainty of W10-1
(σ-W10-1) (G4)
45- 49 F5.2 deg W10-1Err ? Chosen uncertainty of W10-1 to be the
symmetric error (uncW101) (G6)
51- 53 F3.1 --- f_W10-1 ? Selected W101 measurement based on our
criteria flag (W10Gflag1) (G5)
55- 60 F6.1 MHz freq2 Central frequency in sub-band 2 (freq2) (2)
62- 67 F6.2 deg W10-2 ? Measured pulse width for the second
frequency sub-band at 10 per cent of the
pulse profile peak (W102) (G3)
69- 74 F6.2 deg E_W10-2 ? Positive uncertainty of W10-2
(σ+W10-2) (G4)
76- 81 F6.2 deg e_W10-2 ? Negative uncertainty of W10-2
(σ-W10-2) (G4)
83- 88 F6.2 deg W10-2Err ? Chosen uncertainty of W10-2 to be
the symmetric error (uncW102) (G6)
90- 92 F3.1 --- f_W10-2 ? Selected W102 measurement based on
our criteria flag (W10Gflag2) (G5)
94- 99 F6.1 MHz freq3 Central frequency in sub-band 3 (freq3) (3)
101- 106 F6.2 deg W10-3 ? Measured pulse width for the third frequency
sub-band at 10 per cent of the pulse profile
peak (W103) (G3)
108- 112 F5.2 deg E_W10-3 ? Positive uncertainty of W10-3
(σ+W10-3) (G4)
114- 119 F6.2 deg e_W10-3 ? Negative uncertainty of W_10-3
(σ-W10-3) (G4)
121- 125 F5.2 deg W10-3Err ? Chosen uncertainty of W10-3 to be the
symmetric error (uncW103) (G6)
127- 129 F3.1 --- f_W10-3 ? Selected W103 measurement based on our
criteria flag (W10Gflag3) (G5)
131- 136 F6.1 MHz freq4 Central frequency in sub-band 4 (freq4) (4)
138- 143 F6.2 deg W10-4 ? Measured pulse width for the fourth
frequency sub-band at 10 per cent of the
pulse profile peak (W104) (G3)
145- 149 F5.2 deg E_W10-4 ? Positive uncertainty of W10-4
(σ+W10-4) (G4)
151- 156 F6.2 deg e_W10-4 ? Negative uncertainty of W_10-4
(σ-W10-4) (G4)
158- 162 F5.2 deg W10-4Err ? Chosen uncertainty of W10-4 to be
the symmetric error (uncW104) (G6)
164- 166 F3.1 --- f_W10-4 ? Selected W104 measurement based on
our criteria flag (W10Gflag4) (G5)
168- 173 F6.1 MHz freq5 Central frequency in sub-band 5 (freq5) (5)
175- 180 F6.2 deg W10-5 ? Measured pulse width for the fifth
frequency sub-band at 10 per cent of the
pulse profile peak (W105) (G3)
182- 186 F5.2 deg E_W10-5 ? Positive uncertainty of W10-5
(σ+W10-5) (G4)
188- 194 F7.2 deg e_W10-5 ? Negative uncertainty of W_10-5
(σ-W10-5) (G4)
196- 201 F6.2 deg W10-5Err ? Chosen uncertainty of W10-5 to be
the symmetric error (uncW105) (G6)
203- 205 F3.1 --- f_W10-5 ? Selected W105 measurement based on
our criteria flag (W10Gflag5) (G5)
207- 212 F6.1 MHz freq6 Central frequency in sub-band 6 (freq6) (6)
214- 219 F6.2 deg W10-6 ? Measured pulse width for the sixth
frequency sub-band at 10 per cent of the
pulse profile peak (W106) (G3)
221- 226 F6.2 deg E_W10-6 ? Positive uncertainty of W10-6
(σ+W10-6) (G4)
228- 233 F6.2 deg e_W10-6 ? Negative uncertainty of W_10-6
(σ-W10-6) (G4)
235- 240 F6.2 deg W10-6Err ? Chosen uncertainty of W10-6 to be
the symmetric error (uncW106) (G6)
242- 244 F3.1 --- f_W10-6 ? Selected W106 measurement based on
our criteria flag (W10Gflag6) (G5)
246- 251 F6.1 MHz freq7 Central frequency in sub-band 7 (freq7) (7)
253- 258 F6.2 deg W10-7 ? Measured pulse width for the seventh
frequency sub-band at 10 per cent of the
pulse profile peak (W107) (G3)
260- 264 F5.2 deg E_W10-7 ? Positive uncertainty of W10-7
(σ+W10-7) (G4)
266- 271 F6.2 deg e_W10-7 ? Negative uncertainty of W_10-7
(σ-W10-7) (G4)
273- 277 F5.2 deg W10-7Err ? Chosen uncertainty of W10-7 to be
the symmetric error (uncW107) (G6)
279- 281 F3.1 --- f_W10-7 ? Selected W107 measurement based on
our criteria flag (W10Gflag7) (G5)
283- 288 F6.1 MHz freq8 Central frequency in sub-band 8 (freq8) (8)
290- 295 F6.2 deg W10-8 ? Measured pulse width for the eigth
frequency sub-band at 10 per cent of the
pulse profile peak (W108) (G3)
297- 301 F5.2 deg E_W10-8 ? Positive uncertainty of W10-8
(σ+W10-8) (G4)
303- 308 F6.2 deg e_W10-8 ? Negative uncertainty of W_10-8
(σ-W10-8) (G4)
310- 314 F5.2 deg W10-8Err ? Chosen uncertainty of W10-8 to be
the symmetric error (uncW108) (G6)
316- 318 F3.1 --- f_W10-8 ? Selected W108 measurement based on
our criteria flag (W10Gflag8) (G5)
320- 324 F5.2 deg C87 ? Width colour C87 (ColW1087) (G7)
326- 330 F5.2 deg C87Err ? Chosen uncertainty of C87 to be
the symmetric error (uncColW1087) (G8)
332- 336 F5.2 deg E_C87 ? Positive uncertainty of C87
(σ+C87) (G8)
338- 342 F5.2 deg e_C87 ? Negative uncertainty of C87
(σ-C87) (G8)
344- 350 F7.4 --- K87 ? Width contrast K87 (KonW1087) (G7)
352- 357 F6.4 --- e_K87 ? Chosen error of K87 (uncKonW1087) (G8)
359- 364 F6.2 deg C86 ? Width colour C86 (ColW1086) (G7)
366- 370 F5.2 deg C86Err ? Chosen uncertainty of C86 to be the
symmetric error (uncColW1086) (G8)
372- 376 F5.2 deg E_C86 ? Positive uncertainty of C86
(σ+C86) (G8)
378- 382 F5.2 deg e_C86 ? Negative uncertainty of C86
(σ-C86) (G8)
384- 390 F7.4 --- K86 ? Width contrast K86 (KonW1086) (G7)
392- 397 F6.4 --- e_K86 ? Chosen error of K86 (uncKonW1086) (G8)
399- 404 F6.2 deg C85 ? Width colour C85 (ColW1085) (G7)
406- 410 F5.2 deg C85Err ? Chosen uncertainty of C85 to be
the symmetric error (uncColW1085) (G8)
412- 416 F5.2 deg E_C85 ? Positive uncertainty of C85
(σ+C85) (G8)
418- 422 F5.2 deg e_C85 ? Negative uncertainty of C85
(σ-C85) (G8)
424- 430 F7.4 --- K85 ? Width contrast K85 (KonW1085) (G7)
432- 437 F6.4 --- e_K85 ? Chosen error of K85 (uncKonW1085) (G8)
439- 444 F6.2 deg C84 ? Width colour C84 (ColW1084) (G7)
446- 450 F5.2 deg C84Err ? Chosen uncertainty of C84 to be
the symmetric error (uncColW1084) (G8)
452- 456 F5.2 deg E_C84 ? Positive uncertainty of C84
(σ+C84) (G8)
458- 462 F5.2 deg e_C84 ? Negative uncertainty of C84
(σ-C84) (G8)
464- 470 F7.4 --- K84 ? Width contrast K84 (KonW1084) (G7)
472- 477 F6.4 --- e_K84 ? Chosen error of K84 (uncKonW1084) (G8)
479- 484 F6.2 deg C83 ? Width colour C83 (ColW1083) (G7)
486- 490 F5.2 deg C83Err ? Chosen uncertainty of C83 to be the
symmetric error (uncColW1083) (G8)
492- 496 F5.2 deg E_C83 ? Positive uncertainty of C83
(σ+C83) (G8)
498- 502 F5.2 deg e_C83 ? Negative uncertainty of C83
(σ-C83) (G8)
504- 510 F7.4 --- K83 ? Width contrast K83 (KonW1083) (G7)
512- 517 F6.4 --- e_K83 ? Chosen error of K83 (uncKonW1083) (G8)
519- 524 F6.2 deg C82 ? Width colour C82 (ColW1082) (G7)
526- 530 F5.2 deg C82Err ? Chosen uncertainty of C82 to be
the symmetric error (uncColW1082) (G8)
532- 536 F5.2 deg E_C82 ? Positive uncertainty of C82
(σ+C82) (G8)
538- 542 F5.2 deg e_C82 ? Negative uncertainty of C82
(σ-C82) (G8)
544- 550 F7.4 --- K82 ? Width contrast K82 (KonW1082) (G7)
552- 557 F6.4 --- e_K82 ? Chosen error of K82 (uncKonW1082) (G8)
559- 564 F6.2 deg C81 ? Width colour C81 (ColW1081) (G7)
566- 570 F5.2 deg C81Err ? Chosen uncertainty of C81 to be
the symmetric error (uncColW1081) (G8)
572- 576 F5.2 deg E_C81 ? Positive uncertainty of C81
(σ+C81) (G8)
578- 582 F5.2 deg e_C81 ? Negative uncertainty of C81
(σ-C81) (G8)
584- 590 F7.4 --- K81 ? Width contrast K81 (KonW1081) (G7)
592- 597 F6.4 --- e_K81 ? Chosen error of K81 (uncKonW1081) (G8)
599- 604 F6.2 deg C76 ? Width colour C76 (ColW1076) (G7)
606- 610 F5.2 deg C76Err ? Chosen uncertainty of C76 to be
the symmetric error (uncColW1076) (G8)
612- 616 F5.2 deg E_C76 ? Positive uncertainty of C76
(σ+C76) (G8)
618- 622 F5.2 deg e_C76 ? Negative uncertainty of C76
(σ-C76) (G8)
624- 630 F7.4 --- K76 ? Width contrast K76 (KonW1076) (G7)
632- 637 F6.4 --- e_K76 ? Chosen error of K76 (uncKonW1076) (G8)
639- 644 F6.2 deg C75 ? Width colour C75 (ColW1075) (G7)
646- 650 F5.2 deg C75Err ? Chosen uncertainty of C75 to be
the symmetric error (uncColW1075) (G8)
652- 656 F5.2 deg E_C75 ? Positive uncertainty of C75
(σ+C75) (G8)
658- 662 F5.2 deg e_C75 ? Negative uncertainty of C75
(σ-C75) (G8)
664- 670 F7.4 --- K75 ? Width contrast K75 (KonW1075) (G7)
672- 677 F6.4 --- e_K75 ? Chosen error of K75 (uncKonW1075) (G8)
679- 684 F6.2 deg C74 ? Width colour C74 (ColW1074) (G7)
686- 690 F5.2 deg C74Err ? Chosen uncertainty of C74 to be
the symmetric error (uncColW1074) (G8)
692- 696 F5.2 deg E_C74 ? Positive uncertainty of C74
(σ+C74) (G8)
698- 702 F5.2 deg e_C74 ? Negative uncertainty of C74
(σ-C74) (G8)
704- 710 F7.4 --- K74 ? Width contrast K74 (KonW1074) (G7)
712- 717 F6.4 --- e_K74 ? Chosen error of K74 (uncKonW1074) (G8)
719- 724 F6.2 deg C73 ? Width colour C73 (ColW1073) (G7)
726- 730 F5.2 deg C73Err ? Chosen uncertainty of C73 to be
the symmetric error (uncColW1073) (G8)
732- 735 F4.2 deg E_C73 ? Positive uncertainty of C73
(σ+C73) (G8)
737- 741 F5.2 deg e_C73 ? Negative uncertainty of C73
(σ-C73) (G8)
743- 749 F7.4 --- K73 ? Width contrast K73 (KonW1073) (G7)
751- 756 F6.4 --- e_K73 ? Chosen error of K73 (uncKonW1073) (G8)
758- 763 F6.2 deg C72 ? Width colour C72 (ColW1072) (G7)
765- 769 F5.2 deg C72Err ? Chosen uncertainty of C72 to be
the symmetric error (uncColW1072) (G8)
771- 775 F5.2 deg E_C72 ? Positive uncertainty of C72
(σ+C72) (G8)
777- 781 F5.2 deg e_C72 ? Negative uncertainty of C72
(σ-C72) (G8)
783- 789 F7.4 --- K72 ? Width contrast K72 (KonW1072) (G7)
791- 796 F6.4 --- e_K72 ? Chosen error of K72 (uncKonW1072) (G8)
798- 803 F6.2 deg C71 ? Width colour C71 (ColW1071) (G7)
805- 809 F5.2 deg C71Err ? Chosen uncertainty of C71 to be
the symmetric error (uncColW1071) (G8)
811- 814 F4.2 deg E_C71 ? Positive uncertainty of C71
(σ+C71) (G8)
816- 820 F5.2 deg e_C71 ? Negative uncertainty of C71
(σ-C71) (G8)
822- 828 F7.4 --- K71 ? Width contrast K71 (KonW1071) (G7)
830- 835 F6.4 --- e_K71 ? Chosen error of K71 (uncKonW1071) (G8)
837- 841 F5.2 deg C65 ? Width colour C65 (ColW1065) (G7)
843- 847 F5.2 deg C65Err ? Chosen uncertainty of C65 to be
the symmetric error (uncColW1065) (G8)
849- 853 F5.2 deg E_C65 ? Positive uncertainty of C65
(σ+C65) (G8)
855- 859 F5.2 deg e_C65 ? Negative uncertainty of C65
(σ-C65) (G8)
861- 867 F7.4 --- K65 ? Width contrast K65 (KonW1065) (G7)
869- 874 F6.4 --- e_K65 ? Chosen error of K65 (uncKonW1065) (G8)
876- 881 F6.2 deg C64 ? Width colour C64 (ColW1064) (G7)
883- 887 F5.2 deg C64Err ? Chosen uncertainty of C64 to be
the symmetric error (uncColW1064) (G8)
889- 893 F5.2 deg E_C64 ? Positive uncertainty of C64
(σ+C64) (G8)
895- 899 F5.2 deg e_C64 ? Negative uncertainty of C64
(σ-C64) (G8)
901- 907 F7.4 --- K64 ? Width contrast K64 (KonW1064) (G7)
909- 914 F6.4 --- e_K64 ? Chosen error of K64 (uncKonW1064) (G8)
916- 921 F6.2 deg C63 ? Width colour C63 (ColW1063) (G7)
923- 927 F5.2 deg C63Err ? Chosen uncertainty of C63 to be
the symmetric error (uncColW1063) (G8)
929- 933 F5.2 deg E_C63 ? Positive uncertainty of C63
(σ+C63) (G8)
935- 938 F4.2 deg e_C63 ? Negative uncertainty of C63
(σ-C63) (G8)
940- 946 F7.4 --- K63 ? Width contrast K63 (KonW1063) (G7)
948- 953 F6.4 --- e_K63 ? Chosen error of K63 (uncKonW1063) (G8)
955- 960 F6.2 deg C62 ? Width colour C62 (ColW1062) (G7)
962- 966 F5.2 deg C62Err ? Chosen uncertainty of C62 to be
the symmetric error (uncColW1062) (G8)
968- 972 F5.2 deg E_C62 ? Positive uncertainty of C62
(σ+C62) (G8)
974- 978 F5.2 deg e_C62 ? Negative uncertainty of C62
(σ-C62) (G8)
980- 986 F7.4 --- K62 ? Width contrast K62 (KonW1062) (G7)
988- 993 F6.4 --- e_K62 ? Chosen error of K62 (uncKonW1062) (G8)
995-1000 F6.2 deg C61 ? Width colour C61 (ColW1061) (G7)
1002-1006 F5.2 deg C61Err ? Chosen uncertainty of C61 to be
the symmetric error (uncColW1061) (G8)
1008-1012 F5.2 deg E_C61 ? Positive uncertainty of C61
(σ+C61) (G8)
1014-1018 F5.2 deg e_C61 ? Negative uncertainty of C61
(σ-C61) (G8)
1020-1026 F7.4 --- K61 ? Width contrast K61 (KonW1061) (G7)
1028-1033 F6.4 --- e_K61 ? Chosen error of K61 (uncKonW1061) (G8)
1035-1039 F5.2 deg C54 ? Width colour C54 (ColW1054) (G7)
1041-1045 F5.2 deg C54Err ? Chosen uncertainty of C54 to be
the symmetric error (uncColW1054) (G8)
1047-1051 F5.2 deg E_C54 ? Positive uncertainty of C54
(σ+C54) (G8)
1053-1057 F5.2 deg e_C54 ? Negative uncertainty of C54
(σ-C54) (G8)
1059-1065 F7.4 --- K54 ? Width contrast K54 (KonW1054) (G7)
1067-1072 F6.4 --- e_K54 ? Chosen error of K54 (uncKonW1054) (G8)
1074-1079 F6.2 deg C53 ? Width colour C53 (ColW1053) (G7)
1081-1085 F5.2 deg C53Err ? Chosen uncertainty of C53 to be
the symmetric error (uncColW1053) (G8)
1087-1091 F5.2 deg E_C53 ? Positive uncertainty of C53
(σ+C53) (G8)
1093-1097 F5.2 deg e_C53 ? Negative uncertainty of C53
(σ-C53) (G8)
1099-1105 F7.4 --- K53 ? Width contrast K53 (KonW1053) (G7)
1107-1112 F6.4 --- e_K53 ? Chosen error of K53 (uncKonW1053) (G8)
1114-1119 F6.2 deg C52 ? Width colour C52 (ColW1052) (G7)
1121-1126 F6.2 deg C52Err ? Chosen uncertainty of C52 to be
the symmetric error (uncColW1052) (G8)
1128-1132 F5.2 deg E_C52 ? Positive uncertainty of C52
(σ+C52) (G8)
1134-1139 F6.2 deg e_C52 ? Negative uncertainty of C52
(σ-C52) (G8)
1141-1147 F7.4 --- K52 ? Width contrast K52 (KonW1052) (G7)
1149-1155 F7.4 --- e_K52 ? Chosen error of K52 (uncKonW1052) (G8)
1157-1162 F6.2 deg C51 ? Width colour C51 (ColW1051) (G7)
1164-1169 F6.2 deg C51Err ? Chosen uncertainty of C51 to be
the symmetric error (uncColW1051) (G8)
1171-1175 F5.2 deg E_C51 ? Positive uncertainty of C51
(σ+C51) (G8)
1177-1182 F6.2 deg e_C51 ? Negative uncertainty of C51
(σ-C51) (G8)
1184-1190 F7.4 --- K51 ? Width contrast K51 (KonW1051) (G7)
1192-1198 F7.4 --- e_K51 ? Chosen error of K51 (uncKonW1051) (G8)
1200-1205 F6.2 deg C43 ? Width colour C43 (ColW1043) (G7)
1207-1210 F4.2 deg C43Err ? Chosen uncertainty of C43 to be
the symmetric error (uncColW1043) (G8)
1212-1215 F4.2 deg E_C43 ? Positive uncertainty of C43
(σ+C43) (G8)
1217-1220 F4.2 deg e_C43 ? Negative uncertainty of C43
(σ-C43) (G8)
1222-1228 F7.4 --- K43 ? Width contrast K43 (KonW1043) (G7)
1230-1235 F6.4 --- e_K43 ? Chosen error of K43 (uncKonW1043) (G8)
1237-1242 F6.2 deg C42 ? Width colour C42 (ColW1042) (G7)
1244-1248 F5.2 deg C42Err ? Chosen uncertainty of C42 to be
the symmetric error (uncColW1042) (G8)
1250-1253 F4.2 deg E_C42 ? Positive uncertainty of C42
(σ+C42) (G8)
1255-1259 F5.2 deg e_C42 ? Negative uncertainty of C42
(σ-C42) (G8)
1261-1267 F7.4 --- K42 ? Width contrast K42 (KonW1042) (G7)
1269-1274 F6.4 --- e_K42 ? Chosen error of K42 (uncKonW1042) (G8)
1276-1281 F6.2 deg C41 ? Width colour C41 (ColW1041) (G7)
1283-1287 F5.2 deg C41Err ? Chosen uncertainty of C41 to be
the symmetric error (uncColW1041) (G8)
1289-1292 F4.2 deg E_C41 ? Positive uncertainty of C41
(σ+C41) (G8)
1294-1298 F5.2 deg e_C41 ? Negative uncertainty of C41
(σ-C41) (G8)
1300-1306 F7.4 --- K41 ? Width contrast K41 (KonW1041) (G7)
1308-1313 F6.4 --- e_K41 ? Chosen error of K41 (uncKonW1041) (G8)
1315-1320 F6.2 deg C32 ? Width colour C32 (ColW1032) (G7)
1322-1326 F5.2 deg C32Err ? Chosen uncertainty of C32 to be
the symmetric error (uncColW1032) (G8)
1328-1331 F4.2 deg E_C32 ? Positive uncertainty of C32
(σ+C32) (G8)
1333-1337 F5.2 deg e_C32 ? Negative uncertainty of C32
(σ-C32) (G8)
1339-1345 F7.4 --- K32 ? Width contrast K32 (KonW1032) (G7)
1347-1352 F6.4 --- e_K32 ? Chosen error of K32 (uncKonW1032) (G8)
1354-1359 F6.2 deg C31 ? Width colour C31 (ColW1031) (G7)
1361-1365 F5.2 deg C31Err ? Chosen uncertainty of C31 to be
the symmetric error (uncColW1031) (G8)
1367-1371 F5.2 deg E_C31 ? Positive uncertainty of C31
(σ+C31) (G8)
1373-1377 F5.2 deg e_C31 ? Negative uncertainty of C31
(σ-C31) (G8)
1379-1385 F7.4 --- K31 ? Width contrast K31 (KonW1031) (G7)
1387-1392 F6.4 --- e_K31 ? Chosen error of K31 (uncKonW1031) (G8)
1394-1399 F6.2 deg C21 ? Width colour C21 (ColW1021) (G7)
1401-1406 F6.2 deg C21Err ? Chosen uncertainty of C21 to be
the symmetric error (uncColW1021) (G8)
1408-1413 F6.2 deg E_C21 ? Positive uncertainty of C21
(σ+C21) (G8)
1415-1419 F5.2 deg e_C21 ? Negative uncertainty of C21
(σ-C21) (G8)
1421-1427 F7.4 --- K21 ? Width contrast K21 (KonW1021) (G7)
1429-1435 F7.4 --- e_K21 ? Chosen error of K21 (uncKonW1021) (G8)
-------------------------------------------------------------------------------
Note (1): For the first central frequency :
frequency : min = 928.0 MHz max = 952.2 MHz mean = 944.149 MHz
Band-width = 97 MHz
wavelength : min = 31.51 cm max = 32.33 cm mean = 31.78 cm
bandwidth = (30.22 cm - 33.50 cm)
Note (2): For the second central frequency :
frequency : min = 1035.7 MHz max = 1045.7 MHz mean = 1040.2 MHz
Band-width = 97 MHz
wavelength : min = 28.69 cm max = 28.97 cm mean = 28.84 cm
bandwidth = (27.55 cm - 30.25 cm)
Note (3): For the third central frequency :
frequency : min = 1119.7 MHz max = 1152.7 MHz mean = 1134.85 MHz
Band-width = 97 MHz
wavelength : min = 26.03 cm max = 26.79 cm mean = 28.84 cm
bandwidth = (25.35 cm - 27.62 cm)
Note (4): For the fourth central frequency :
frequency : min = 1224.8 MHz max = 1244.2 MHz mean = 1231.62 MHz
Band-width = 97 MHz
wavelength : min = 24.11 cm max = 24.49 cm mean = 24.36 cm
bandwidth = (23.44 cm - 25.36 cm)
Note (5): For the fifth central frequency :
frequency : min = 1330.3 MHz max = 1341.1 MHz mean = 1333.28 MHz
Band-width = 97 MHz
wavelength : min = 22.37 cm max = 22.55 cm mean = 22.50 cm
bandwidth = (21.71 cm - 23.35 cm)
Note (6): For the sixth central frequency :
frequency : min = 1422.7 MHz max = 1430.8 MHz mean = 1429.1 MHz
Band-width = 97 MHz
wavelength : min = 20.97 cm max = 21.09 cm mean = 20.99 cm
bandwidth = (20.30 cm - 21.73 cm)
Note (7): For the seventh central frequency :
frequency : min = 1496.4 MHz max = 1526.1 MHz mean = 1519.56 MHz
Band-width = 97 MHz
wavelength : min = 19.66 cm max = 20.05 cm mean = 19.74 cm
bandwidth = (19.13 cm 20.39 cm)
Note (8): For the eigth central frequency :
frequency : min = 1622.8 MHz max = 1638.3 MHz mean = 1627.28 MHz
Band-width = 97 MHz
wavelength : min = 18.31 cm max = 18.49 cm mean = 18.44 cm
bandwidth = (17.90 cm - 19.00 cm)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablec1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- PSR Pulsar name (PSRJ)
13 I1 --- Component Major or minor intensity peak flag
(Component) (G2)
15- 19 F5.2 deg alpha Obliquity α which is the angle between
magnetic and rotation axes (α) (1)
21- 26 F6.2 deg e_alpha Negative uncertainty of α
(σ-α) (2)
28- 32 F5.2 deg E_alpha Positive uncertainty of α
(σ+α) (2)
--------------------------------------------------------------------------------
Note (1): We use the simulation data set by JK19 (Johnston and Karastergiou
2019MNRAS.485..640J 2019MNRAS.485..640J) to obtain estimates of the angles α for
each pulsar based on its known period and measured W10, by
marginalizing over the parameters height and beam filling factor
in the JK19 model, and assuming β => 0 (the angle between
the magnetic axis and the observer's line of sight) for simplicity,
(i.e see the section 4.3 Geometry constraints based on the population
statistics). This data is the 50 per cent quantile of α.
Note (2): σ-α and σ+α indicate the uncertainties
based on the 16 per cent, 50 per cent, and 84 percentiles.
--------------------------------------------------------------------------------
Global notes:
Note (G1): IPflag indicates pulsars that are thought to have interpulses.
Note (G2): The component lists whether the measurement is for the major
(quoted 1) or minor (quoted 2) peak in the pulse profile of the
interpulse pulsar.
Note (G3): In order to measure pulse widths, we define a contiguous analysis
region (or on-pulse region) around the pulse. We use the pulse
profile data (after baseline subtraction), the
Gaussian-Profile-derived noiseless profile, and σGP
(noise variances), by requiring the edges to have a minimum
signal-to-noise ratio of three in (at least) five subsequent bins.
The peak of the noiseless profile and σGP define our peak
signal-to-noise ratio, S/N. The pulse widths W50, W10, W5,
W1 correspond to measurements where the noiseless pulse profile
is 50 per cent, 10 per cent, 5 per cent, and 1 per cent of its peak
value, respectively, (i.e see the entire section 3 Data analysis).
Note (G4): Width uncertainties are obtained from taking measurements at
±1σGP (e.g. for W50 the width measurement at 50 per cent
of the peak value ±1σGP defines the ±1σ uncertainty
of W50). This approach only returns whole phase bin values, and for
very small uncertainties (< 0.5 bin) a value of 0 is returned.
In such cases, we set the uncertainty to a conservative 0.5 bin value
for the analysis steps. The width uncertainties are often
slightly asymmetric (σ+, σ-) as can be seen from the
listed values, (i.e see the section 3.2 Width measurements).
Note (G5): The Gflag (True if it is 1) indicates whether a width measurement
fulfils our criterion for a 'valid' measurement to be included in
our analysis.
Note (G6): Where we applied symmetric errors in subsequent analysis
(e.g. power law fits), we chose the larger of the two uncertainties.
Based on the binning of our data and our error definitions, we
require width measurements to be at least 3 bins (or approximately
1 degree in rotational phase) to be included in our analysis.
Note (G7): As explained in the section 4.4 Width colours and contrasts, in order
to describe frequency-dependent changes of the widths, we define
width colours, Cxy, and width contrasts, Kxy. The width colour
is the difference of two width measurements in two frequency
channels x and y, Cxy = W10,x - W10,y. For the width
contrasts, we defined it as Kxy,t = (W10,x - W10,y)/W10,t
where W10,t is the width measurement in the total frequency band.
Note (G8): The W10 measurements typically have heteroscedastic uncertainties.
We consider this heteroscedasticity in the colour uncertainty
estimates in a conservative way. Thus, for the negative (positive)
uncertainty of Cxy, we consider the negative (positive) error of
W10,x and the positive (negative) error of W10,y for the error
propagation. For the uncertainty estimate of the contrast, we use
error propagation with the maximum error of each width measurement.
The contrast is useful to emphasize changes across the population
since it normalizes the change for each individual pulsar.
However, due to the additional term in the contrast formula, it
also has a larger uncertainty,
(i.e see section 4.4 Width colours and contrasts).
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Luc Trabelsi (CDS) 27-Aug-2024