J/MNRAS/450/2922 HTRU survey new pulsars (Ng+, 2015)
The High Time Resolution Universe Pulsar Survey.
XII. Galactic plane acceleration search and the discovery of 60 pulsars.
Ng C., Champion D.J., Bailes M., Barr E.D., Bates S.D., Bhat N.D.R.,
Burgay M., Burke-Spolaor S., Flynn C.M.L., Jameson A., Johnston S.,
Keith M.J., Kramer M., Levin L., Petroff E., Possenti A., Stappers B.W.,
Van Straten W., Tiburzi C., Eatough R.P., Lyne A.G.
<Mon. Not. R. Astron. Soc., 450, 2922-2947 (2015)>
=2015MNRAS.450.2922N 2015MNRAS.450.2922N (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Pulsars
Keywords: methods: data analysis - surveys - stars: neutron - pulsars: general
Abstract:
We present initial results from the low-latitude Galactic plane region
of the High Time Resolution Universe pulsar survey conducted at the
Parkes 64-m radio telescope. We discuss the computational challenges
arising from the processing of the terabyte-sized survey data. Two new
radio interference mitigation techniques are introduced, as well as a
partially coherent segmented acceleration search algorithm which aims
to increase our chances of discovering highly relativistic short-orbit
binary systems, covering a parameter space including potential
pulsar-black hole binaries. We show that under a constant acceleration
approximation, a ratio of data length over orbital period of ∼0.1
results in the highest effectiveness for this search algorithm. From
the 50 per cent of data processed thus far, we have redetected 435
previously known pulsars and discovered a further 60 pulsars, two of
which are fast-spinning pulsars with periods less than 30ms. PSR
J1101-6424 is a millisecond pulsar whose heavy white dwarf (WD)
companion and short spin period of 5.1ms indicate a rare example of
full-recycling via Case A Roche lobe overflow. PSR J1757-27 appears to
be an isolated recycled pulsar with a relatively long spin period of
17ms. In addition, PSR J1244-6359 is a mildly recycled binary system
with a heavy WD companion, PSR J1755-25 has a significant orbital
eccentricity of 0.09 and PSR J1759-24 is likely to be a long-orbit
eclipsing binary with orbital period of the order of tens of years.
Comparison of our newly discovered pulsar sample to the known
population suggests that they belong to an older population.
Furthermore, we demonstrate that our current pulsar detection yield is
as expected from population synthesis.
Description:
Observations for the HTRU Galactic plane survey at Parkes took place
between 2008 November and 2013 December, which comprise 1230 scheduled
pointings each with 72-min long observations with just over 226
samples. The observations have their two polarizations summed, before
being written to tape for storage. Several corrupted pointings (due to
severe RFI contamination or hardware issues) were reobserved, hence
finally 1246 pointings were recorded, resulting in 263 terabyte (TB)
of observational raw data.
A total of 60 pulsars have been discovered in the 50 per cent
processed data of the Galactic plane survey.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 55 60 The S/N, flux density (S1400), derived
luminosity (L1400) and pulse widths (W50, W10)
of the 60 newly discovered pulsars
table4.dat 185 30 TEMPO2 best-fitting parameters of 30 newly
discovered isolated pulsars from the HTRU
Galactic plane survey
table6.dat 79 27 Discovery parameters of 27 newly discovered
pulsars from the HTRU Galactic plane survey,
which have not yet enough TOAs to produce a
coherent timing solution
tablec1.dat 98 435 The 435 previously known pulsars that have been
re-detected in the 50 per cent processed data
of the HTRU Galactic plane survey
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See also:
J/MNRAS/423/1351 : Energy distribution in pulsars (Burke-Spolaor+, 2012)
J/MNRAS/427/1052 : HTRU survey. Timing of 54 pulsars (Bates+, 2012)
J/MNRAS/450/2922 : HTRU survey new pulsars (Ng+, 2015)
http://www.atnf.csiro.au/research/pulsar/psrcat/ : ATNF Home Page
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- PSR PSR name (JHHMM+DDMM or JHHMM+DD) (G1)
13- 16 F4.1 --- S/NHTRU HTRU signal-to-noise ratio
18- 21 F4.1 --- S/Nmedlat ?=- Mdelat signal-to-noise ratio
23 A1 --- l_S/NPMPS Limit flag on S/NPMPS
24- 27 F4.1 --- S/NPMPS ?=- MPS signal-to-noise ratio
30- 33 F4.2 mJy S1400 ?=- Flux density at 1.4GHz
36- 40 F5.2 ms W50 ?=- Pulse width at 50%
43- 48 F6.2 ms W10 Pulse width at 10%
51- 55 F5.2 mJy/kpc2 L1400 ?=- Derived luminosity at 1.4GHz
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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- 11 A11 --- PSR PSR name (G1)
12 A1 --- n_PSR [c] Note on PSR (2)
14- 15 I2 h RAh Right ascension (J2000)
17- 18 I2 min RAm Right ascension (J2000)
20- 25 F6.3 s RAs Right ascension (J2000)
27- 30 F4.3 s e_RAs rms uncertainty (1sigma) on right ascension
32 A1 --- DE- Declination sign (J2000)
33- 34 I2 deg DEd Declination (J2000)
36- 37 I2 arcmin DEm Declination (J2000)
39- 43 F5.2 arcsec DEs ? Declination (J2000)
44- 49 F6.2 arcsec e_DEs rms uncertainty (1sigma) on declination
51- 56 F6.2 deg GLON Galactic longitude
58- 62 F5.2 deg GLAT Galactic latitude
64- 79 F16.11 ms P Spin period
81- 92 F12.11 ms e_P rms uncertainty (1sigma) on P
94-103 F10.2 10-18 dP/dt Pediod derivative
105-110 F6.2 10-18 e_dP/dt rms uncertainty (1sigma) on dP/dt
112-116 F5.1 pc/cm3 DM Dispersion measure
118-121 F4.1 pc/cm3 e_DM ? rms uncertainty (1sigma) on DM
123-126 F4.1 kpc Dist Distance (3)
128-138 A11 --- MJDspan MJD Data span (MJDs-MJDe)
(fitting related parameter)
140-144 I5 d Epoch Reference epoch (MJD)
(fitting related parameter)
146-148 I3 ---- NTOA Number of TOAs employed
(fitting related parameter)
150-153 I4 us rms rms of the TEMPO2 fit
(fitting related parameter)
155-157 F3.1 --- chi2r Reduced chi2
(fitting related parameter) (4)
159 A1 --- l_tauc Limit flag on tauc
160-166 F7.2 Myr tauc Characteristic age (4)
167 A1 --- n_tauc [b] Note on tauc (6)
168 A1 --- l_Bsurf Limit flag on Bsurf
169-174 F6.2 10+10gauss Bsurf Surface magnetic field (4)
175 A1 --- n_Bsurf [b] Note on Bsurf (6)
176 A1 --- l_dE/dt Limit flag on dE/dt
177-184 F8.1 10+23W dE/dt Spin-down energy (10+30erg/s) (5)
185 A1 --- n_dE/dt [b] Note on dE/dt (6)
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Note (2): c: Note that PSR J1835-0924b is unrelated to the previously known
PSR J1835-0924, which has a catalogue spin period of 859.192ms at
a DM of 471pc/cm3.
Note (3): Pulsar distances are derived according to Cordes & Lazio
(2002, priv. comm.).
Note (4): The reduced chi2 stated here represents the value before the
application of EFAC. Note that the rest of the timing solutions have EFACs
incorporated, bringing the reduced chi2 to unity.
Note (5): The characteristic age, the surface magnetic field and the spin-down
energy are derived using equations which can be found in Lorimer & Kramer
(2005).
Note (6): b: For PSR J1829-1011, the period derivative related parameters are
derived with the 2σ upper limit of dP/t<7.4*10-17.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- PSR PSR name (JHHMM+DD) (1)
10- 11 I2 h RAh Right ascension (J2000)
13- 16 F4.1 min RAm Right ascension (J2000)
18- 19 F2.1 min e_RAm rms uncertainty (1sigma) on right ascension
21 A1 --- DE- Declination sign (J2000)
22- 23 I2 deg DEd Declination (J2000)
25- 26 I2 arcmin DEm Declination (J2000)
28 I1 arcmin e_DEm rms uncertainty (1sigma) on declination
30- 35 F6.2 deg GLON Galactic longitude
37- 41 F5.2 deg GLAT Galactic latitude
43- 56 F14.9 ms P Spin period
58- 67 F10.9 ms e_P rms uncertainty (1sigma) on P
69- 71 I3 pc/cm3 DM Dispersion measure
73- 74 I2 pc/cm3 e_DM ? rms uncertainty (1sigma) on DM
76- 79 F4.1 kpc Dist Distance (2)
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Note (1): All of these pulsars have been assigned a temporary name containing
only two digits of declination.
Note (2): The distances are derived according to Cordes & Lazio
(2002, priv. comm.).
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Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 A13 ---- PSR The pulsar name
15- 36 A22 ---- ObsID The observation for which the pulsar was
re-detected (stands for the date and the time
in UT, YYYY-MM-DD-hh:mm:ss/NN)
38- 44 F7.3 deg GLON Galactic longitude that corresponds to the
central position of the receiver beam of
that observation
46- 51 F6.3 deg GLAT Galactic latitude that corresponds to the
central position of the receiver beam of
that observation
53- 56 F4.2 deg Offset The offset between the observed and the true
position of the pulsar (1)
58- 65 F8.3 ms Pobs The observed spin period
66 A1 --- n_Pobs [*+d] Note on Pobs (2)
68- 73 F6.1 pc/cm3 DMobs The observed dispersion measure (DM)
75- 80 F6.2 mJy Sexp ? The expected flux density at 1.4GHz
81 A1 ---- n_Sexp [*] * when no flux density is published on
PSRCAT
83- 89 F7.1 --- S/Nexp ? The expected S/N calculated according to
the radiometer equation
90 A1 ---- n_S/Nexp [*] * when no flux density is published on
PSRCAT
92- 98 F7.1 --- S/Nobs The observed S/N
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Note (1): Note that in the case when a pulsar was re-detected multiple times in
different observations we have listed only the re-detection which was closest
to the pulsar i.e. that with the smallest offset.
Note (2): Note on observed spin period as follows:
+ = Spin period originally detected at the second harmonics i.e.
at half of the fundamental spin period listed here
d = Spin period originally detected at the third harmonics i.e.
at one third of the fundamental spin period listed here
* = Spin period originally detected at the half harmonics i.e.
at twice the fundamental spin period listed here
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Global notes:
Note (G1): Pulsars for which no full timing solution is available have been
assigned a temporary name containing only two digits of declination.
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History:
From electronic version of the journal
References:
Keith et al., Paper I 2010MNRAS.409..619K 2010MNRAS.409..619K
Bates et al., Paper II 2011MNRAS.416.2455B 2011MNRAS.416.2455B
Burke-Spolaor et al., Paper III 2011MNRAS.416.2465B 2011MNRAS.416.2465B
Keith et al., Paper IV 2012MNRAS.419.1752K 2012MNRAS.419.1752K
Burke-Spolaor et al., Paper V 2012MNRAS.423.1351B 2012MNRAS.423.1351B, Cat. J/MNRAS/423/1351
Bates et al., Paper VI 2012MNRAS.427.1052B 2012MNRAS.427.1052B, Cat. J/MNRAS/427/1052
Burgay et al., Paper VII 2013MNRAS.433..259B 2013MNRAS.433..259B
Levin et al., Paper VIII 2013MNRAS.434.1387L 2013MNRAS.434.1387L
Tiburzi t al., Paper IX 2013MNRAS.436.3557T 2013MNRAS.436.3557T
Ng et al;, Paper X 2014MNRAS.439.1865N 2014MNRAS.439.1865N
Bates et al., Paper XI 2015MNRAS.446.4019B 2015MNRAS.446.4019B
Ng et al., Paper XII 2015MNRAS.450.2922N 2015MNRAS.450.2922N, Cat. J/MNRAS/450/2922
Cameron et al. Paper XIII 2018MNRAS.475L..57C 2018MNRAS.475L..57C
(End) Patricia Vannier [CDS] 19-May-2016