J/A+A/664/A27 14 pulsars in NGC 1851 using MeerKAT (Ridolfi+, 2022)
TRAPUM discovery of 13 new pulsars in NGC 1851 using MeerKAT.
Ridolfi A., Freire P.C.C., Gautam T., Ransom S.M., Barr E.D., Buchner S.,
Burgay M., Abbate F., Venkatraman Krishnan V., Vleeschower L., Possenti A.,
Stappers B.W., Kramer M., Chen W., Padmanabh P.V., Champion D.J., Bailes M.,
Levin L., Keane E. F., Breton R. P., Bezuidenhout M., Griessmeier J.-M.,
Kuenkel L., Men Y., Camilo F., Geyer M., Hugo B. V., Jameson A.,
Parthasarathy A., Serylak M.
<Astron. Astrophys. 664, A27 (2022)>
=2022A&A...664A..27R 2022A&A...664A..27R (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ; Pulsars
Keywords: stars: neutron - stars: binaries - pulsars: general -
globular clusters: individual: NGC 1851
Abstract:
We report the discovery of 13 new pulsars in the globular cluster NGC
1851 by the TRAPUM Large Survey Project using the MeerKAT radio
telescope. The discoveries consist of six isolated millisecond pulsars
(MSPs) and seven binary pulsars, of which six are MSPs and one is
mildly recycled. For all the pulsars, we present the basic kinematic,
astrometric, and orbital parameters, where applicable, as well as
their polarimetric properties, when these are measurable. Two of the
binary MSPs (PSR J0514-4002D and PSR J0514-4002E) are in wide and
extremely eccentric (e>0.7) orbits with a heavy white dwarf and a
neutron star as their companion, respectively. With these discoveries,
NGC 1851 is now tied with M28 as the cluster with the third largest
number of known pulsars (14). Its pulsar population shows remarkable
similarities with that of M28, Terzan 5 and other clusters with
comparable structural parameters. The newly-found pulsars are all
located in the innermost regions of NGC 1851 and will likely enable,
among other things, detailed studies of the cluster structure and
dynamics.
Description:
We searched MeerKAT data of the globular cluster NGC 1851 and
discovered 13 new pulsars, in addition to the one already known. We
folded the UHF search-mode data taken with the MeerKAT PTUSE backend
to obtain the integrated pulsed profiles of all the 14 known pulsars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 115 14 14 known pulsars in NGC 1851 and their main
characteristics
list.dat 147 18 List of fits files
fits/* . 18 Individual fits files
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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 A1 --- Pulsar [A-N] Pulsar designation
3- 11 A9 --- Type Type (Isolated or Binary)
12- 18 F7.4 ms P Barycentric spin period
20- 26 F7.4 pc/cm3 DM Dispersion measure
28- 33 F6.4 pc/cm3 e_DM Dispersion measure error
35- 40 F6.3 d Pb ?=- Orbital period
42- 47 F6.3 al/s xp ?=- Projected semi-major axis of
the pulsar orbit
49- 54 F6.4 --- e ?=- Eccentricity
56- 59 F4.2 Msun Mcmin ?=- Minimum companion mass as derived from
the mass function, assuming a pulsar mass
of Mp=1.4M☉
61- 62 I2 h RAh Right ascension (J2000)
64- 65 I2 min RAm Right ascension (J2000)
67- 73 F7.4 s RAs Right ascension (J2000)
75- 80 F6.4 s e_RAs ? Right ascension error
82 A1 --- DE- Declination sign (J2000)
83- 84 I2 deg DEd Declination (J2000)
86- 87 I2 arcmin DEm Declination (J2000)
89- 94 F6.3 arcsec DEs Declination (J2000)
96-100 F5.3 arcsec e_DEs ? Declination error
101 A1 --- n_Pos [*] Note on position (1)
103-105 I3 uJy SUHF Average mean flux density in the
MeerKAT UHF band
107-109 I3 uJy e_SUHF Average mean flux density in the
MeerKAT UHF band error
111-113 I3 rad/m2 RM ?=- Rotation measure
115 I1 rad/m2 e_RM ?=- Rotation measure error
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Note (1): *: Localization of pulsar M with SeeKAT was not possible due to the
faintness and scarcity of its detections. Therefore, the reported coordinates
are those of the central beam of the TRAPUM tilings, where pulsar M is always
detected with highest S/N.
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right Ascension (J2000)
4- 5 I2 min RAm Right Ascension (J2000)
7- 11 F5.2 s RAs Right Ascension (J2000)
12 A1 --- DE- Declination sign (J2000)
13- 14 I2 deg DEd Declination (J2000)
16- 17 I2 arcmin DEm Declination (J2000)
19- 22 F4.1 arcsec DEs Declination (J2000)
24- 42 A19 "datime" Obs.date Observation date
44- 48 I5 Kibyte size Size of FITS file
50- 79 A30 --- FileName Name of FITS file, in subdirectory fits
81-147 A67 --- Title Title of the FITS file
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Acknowledgements:
A. Ridolfi, alex88.ridolfi AT gmail.com
(End) Patricia Vannier [CDS] 01-Jul-2022