J/MNRAS/489/1543 Arecibo polarimetric single-pulse survey (Olszanski+, 2019)
Arecibo 4.5/1.4/0.33-GHz polarimetric single-pulse emission survey.
Olszanski T.E.E., Mitra D., Rankin J.M.
<Mon. Not. R. Astron. Soc., 489, 1543-1555 (2019)>
=2019MNRAS.489.1543O 2019MNRAS.489.1543O (SIMBAD/NED BibCode)
ADC_Keywords: Pulsars ; Polarization ; Spectra, radio
Keywords: MHD - plasmas - radiation mechanisms: non-thermal -
pulsars: general - pulsars: individual: B0540+23 -
pulsars: individual: B0823+26
Abstract:
We report on an Arecibo 4.5-GHz polarimetric single-pulse survey of
the brightest pulsars at high frequency within its sky. The
high-frequency profiles are accompanied by a collection of both
previously published and unpublished high quality 1.4- and 0.33-GHz
observations. Here our analyses and discussion primarily involve the
average and statistical properties of the 46 pulsars polarimetric
pulse sequences, profile classification and frequency evolution, and
polarimetric profiles and peak-occurrence histograms. In most cases
both the fractional linear polarization and profile widths decrease
with frequency as expected, but there are some exceptions. Similarly,
we were able to review and/or extend the profile classifications for
this population of pulsars and work out their beaming characteristics
quantitatively showing that almost all show properties compatible with
the core/double-cone emission beam model. The entirety of these
observations' average profiles are accessible for download.
Description:
All the recent observations (2013-2019) were carried out using
Arecibo's Mock spectrometers
(http://www.naic.edu/phil/hardware/pdev/pdev.html) in single pixel
mode, but for a few cases where we lacked useable Mock observations,
we instead included older (2005) WAPP3 observations. Each Mock
spectrometer was configured for individual bandwidths of 170, 85, or
12.5MHz at three frequencies: 4.6GHz (C band), 1.4GHz (L band), and
327MHz (P band). Seven Mocks were used at C band for a total 1-GHz
bandwidth; whereas, at L and P bands four Mocks were used to provide a
total nominal bandwidth of 350 or 50MHz, respectively. The WAPPs were
used prior to early 2011 (MJD 55600), and their configurations were
similar, apart from 100-MHz bandwidths at L band. All three receiver
systems have orthogonal linear feeds, but a circular hybrid was
intermittently present in the P-band signal path for very long
baseline interferometry (VLBI) observations.
The 46 pulsars in this C-band single-pulse polarimetric survey are
necessarily a population of some of the brightest pulsars in the
Arecibo sky. Some are bright across most of their observable band and
some are bright because of relatively flat spectra.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 83 46 Observation information
table2.dat 62 46 Pulsar parameters
table3.dat 93 46 Profile width information
table4.dat 100 47 Pulsar geometry information
table5.dat 94 46 Polarization information
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Pulsar name
12- 15 F4.2 s P Pulsar rotational period
17- 21 F5.1 pc/cm3 DM Dispersion measure
23- 29 F7.2 rad.m2 RM Rotation measure
31- 35 I5 d MJDP ? Modified Julian date of the P band
observation
37 A1 --- f_MJDP [*] Flag on MJDP (1)
39- 43 I5 --- NpP ? Number of pulses on the P band
45- 48 I4 --- BinsP ? Binning on the P band
50- 54 I5 d MJDL Modified Julian date of the L band observation
56- 61 I6 --- NpL Number of pulses on the L band
63- 66 I4 --- BinsL Binning on the L band
68- 72 I5 d MJDC Modified Julian date of the C band observation
74- 78 I5 --- NpC Number of pulses on the C band
80- 83 I4 --- BinsC Binning on the C band
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Note (1): Flag as follows:
* = MJDs marked by an asterisk identify WAPP observations
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Pulsar name
12- 17 F6.4 s P Pulsar rotation period
19- 26 E8.2 s/s Pdot Pulsar spin-down
28- 34 E7.1 10-7W Edot Pulsar spin-down energy (1)
36- 43 E8.2 yr tau Pulsar spin-down age (2)
45- 51 E7.1 gauss Bsurf Pulsar magnetic field
53- 57 F5.1 --- B12/P2 Pulsar acceleration parameter
59- 62 F4.1 --- 1/Q Beskin, Gurevich & Istomin's
(1993ppm..book.....B 1993ppm..book.....B) 1/Q parameter
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Note (1): Edot=4π2*I*Pdot/P3, where I is the Strokes intensity parameter
Note (2): The age is computed as τ=P/Pdot
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Pulsar name
12- 15 F4.1 deg W50P ? Width of pulse at 50% of peak intensity in
the P band
17- 19 F3.1 deg e_W50P ? Error on W50P
21- 24 F4.1 deg W10P ? Width of pulse at 10% of peak intensity in
the P band
26- 28 F3.1 deg e_W10P ? Error on W10P
30- 33 F4.1 deg W5sP ? Width of pulse at 5σ from the peak in
the P band
35- 37 F3.1 deg e_W5sP ? Error on W5sP
39- 42 F4.1 deg W50L Width of pulse at 50% of peak intensity in the
L band
44- 46 F3.1 deg e_W50L Error on W50L
48- 52 F5.1 deg W10L Width of pulse at 10% of peak intensity in the
L band
54- 56 F3.1 deg e_W10L Error on W10L
58- 62 F5.1 deg W5sL Width of pulse at 5σ from the peak in the
L band
64- 66 F3.1 deg e_W5sL Error on W5sL
68- 71 F4.1 deg W50C Width of pulse at 50% of peak intensity in the
C band
73- 75 F3.1 deg e_W50C Error on W50C
77- 80 F4.1 deg W10C Width of pulse at 10% of peak intensity in the
C band
82- 84 F3.1 deg e_W10C Error on W10C
86- 89 F4.1 deg W5sC ? Width of pulse at 5σ from the peak in
the C band
91- 93 F3.1 deg e_W5sC ? Error on W5sC
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Pulsar name
12 A1 --- f_Name [mi] Flag on Name (1)
14- 19 A6 --- Class Pulsar class
21 A1 --- u_Wcore [~] Uncertainty flag on Wc
23- 27 F5.2 deg Wcore ? Core half-power width at 1GHz
29 A1 --- f_Wcore [?] Flag on Wc
31- 34 F4.1 deg Wcap Pulsar polar cap (2)
36- 37 I2 deg alpha ? Magnetic colatitude (3)
39- 44 F6.1 --- R ? Maximum rate of polarization-angle rotation
at the center of the profile (4)
46 A1 --- f_R [*?] Flag on R (5)
48- 52 F5.1 deg beta ? Sightline impact angle
54 A1 --- u_Wcone1 [~] Uncertainty flag on Wcone1
56- 60 F5.1 deg Wcone1 ? Inner cone width
62 A1 --- f_Wcone1 [?] Flag on Wcone1
64- 67 F4.1 deg rho1 ? Outside half-power radius of the inner cone
69- 73 F5.2 deg b/r1 ? beta to rho1 ratio (β/ρ1)
75 A1 --- u_Wcone2 [~] Uncertainty flag on Wcone2
77- 80 F4.1 deg Wcone2 ? Outer cone width
82- 85 F4.1 deg rho2 ? Outside half-power radius of the outer cone
87- 91 F5.2 deg b/r2 ? beta to rho2 ratio (β/ρ2)
93- 96 I4 km hcone1 ? Emisson characteristic height of the inner
cone
98-100 I3 km hcone2 ? Emisson characteristic height of the outer
cone
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Note (1): Flag as follows:
m = B1929+10's main pulse
i = B1929+10's interpulse
Note (2): The pulsar's polar cap is computed as Wcap=2.45P-1/2, where P is
the pulsar's period
Note (3): The magnetic colatitude α can be estimated from the width of
the core component when present, as its expected half-power width at
1GHz, Wcore is equal to Wcap/sinα
Note (4): R is defined as |dχ/dφ|, where χ is the polarization
angle and φ is the longitude. We also have R=sinα/sinβ.
Note (5): Flag as follows:
* = R is equal to infinity in the original table
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Pulsar name
12- 15 F4.1 % LP ? Fractional linear polarization in the P band
17- 19 F3.1 % e_LP ? Error on LP
21- 25 F5.1 % VP ? Fractional circular polarization in the P
band
27- 29 F3.1 % e_VP ? Error on VP
31- 34 F4.1 % VabsP ? Absolute fractional circular polarization
in the P band
36- 38 F3.1 % e_VabsP ? Error on VabsP
40- 43 F4.1 % LL Fractional linear polarization in the L band
45- 47 F3.1 % e_LL Error on LL
49- 53 F5.1 % VL Fractional circular polarization in the L band
55- 57 F3.1 % e_VL Error on VL
59- 62 F4.1 % VabsL Absolute fractional circular polarization in
the L band
64- 66 F3.1 % e_VabsL Error on VabsL
68- 71 F4.1 % LC ? Fractional linear polarization in the C band
73- 75 F3.1 % e_LC ? Error on LC
77- 81 F5.1 % VC ? Fractional circular polarization in the C
band
83- 85 F3.1 % e_VC ? Error on VC
87- 90 F4.1 % VabsC ? Absolute fractional circular polarization
in the C band
92- 94 F3.1 % e_VabsC ? Error on VabsC
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 03-Jan-2023