2022ApJ...934L..21Z

Query : 2022ApJ...934L..21Z

2022ApJ...934L..21Z - Astrophys. J., 934, L21 (2022/August-1)

Radio Detection of an Elusive Millisecond Pulsar in the Globular Cluster NGC 6397.

ZHANG L., RIDOLFI A., BLUMER H., FREIRE P.C.C., MANCHESTER R.N., McLAUGHLIN M., KREMER K., CAMERON A.D., ZHANG Z., BEHREND J., BURGAY M., BUCHNER S., CHAMPION D.J., CHEN W., DAI S., FENG Y., FU X., GUO M., HOBBS G., KEANE E.F., KRAMER M., LEVIN L., LI X., NI M., PAN J., PADMANABH P.V., POSSENTI A., RANSOM S.M., TSAI C.-W., VENKATRAMAN KRISHNAN V., WANG P., ZHANG J., ZHI Q., ZHANG Y. and LI D.

Abstract (from CDS):

We report the discovery of a new 5.78 ms period millisecond pulsar (MSP), PSR J1740-5340B (NGC 6397B), in an eclipsing binary system discovered with the Parkes radio telescope (now also known as Murriyang) in Australia and confirmed with the MeerKAT radio telescope in South Africa. The measured orbital period, 1.97 days, is the longest among all eclipsing binaries in globular clusters (GCs) and consistent with that of the coincident X-ray source U18, previously suggested to be a “hidden MSP.” Our XMM-Newton observations during NGC 6397B's radio-quiescent epochs detected no X-ray flares. NGC 6397B is either a transitional MSP or an eclipsing binary in its initial stage of mass transfer after the companion star left the main sequence. The discovery of NGC 6397B potentially reveals a subgroup of extremely faint and heavily obscured binary pulsars, thus providing a plausible explanation for the apparent dearth of binary neutron stars in core-collapsed GCs as well as a critical constraint on the evolution of GCs.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Globular star clusters - Eclipsing binary stars - Millisecond pulsars

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 PSR J0514-4002E Psr 05 14 06.68 -40 02 47.7           ~ 17 0
2 PSR J0514-4002A Psr 05 14 06.6927 -40 02 48.897           ~ 69 1
3 PSR J0514-4002D Psr 05 14 06.73 -40 02 48.2           ~ 3 0
4 PSR J1023+0038 Psr 10 23 47.6841824712 +00 38 41.005893516     17.31     GV 470 0
5 XSS J12270-4859 Psr 12 27 58.7476831464 -48 53 42.824592960           ~ 321 0
6 PSR J1417-4402 Psr 14 17 30.5732900514 -44 02 57.497992802     15.84     ~ 32 0
7 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
8 Cl* NGC 6397 SAW V31 El? 17 40 42.6230201282 -53 40 27.291274010   16.41 15.95 16.10   ~ 22 0
9 [GHE2001b] U97 X 17 40 43.918 -53 40 05.90   22.88   20.90   ~ 4 0
10 PSR J1740-5340 Psr 17 40 44.589 -53 40 40.90   17.43   16.25   ~ 157 2
11 PSR J1807-2459A Psr 18 07 20.36 -24 59 52.6           ~ 30 0
12 PSR J1823-3021G Psr 18 23 40.7213 -30 21 35.630           ~ 13 0
13 IGR J18245-2452 LXB 18 24 32.50 -24 52 07.8           ~ 253 0
14 PSR J1835-3259A Psr 18 35 44.856 -32 59 25.08           ~ 22 0
15 PSR J2129+1209C Psr 21 30 01.2030 +12 10 38.159           ~ 215 2

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