2015ApJ...807L..23D


Query : 2015ApJ...807L..23D

2015ApJ...807L..23D - Astrophys. J., 807, L23 (2015/July-2)

A highly eccentric 3.9 millisecond binary pulsar in the globular cluster NGC 6652.

DECESAR M.E., RANSOM S.M., KAPLAN D.L., RAY P.S. and GELLER A.M.

Abstract (from CDS):

We present the Robert C. Byrd Green Bank Telescope discovery of the highly eccentric binary millisecond pulsar PSR J1835-3259A in the Fermi Large Area Telescope-detected globular cluster NGC 6652. Timing over one orbit yields the pulse period 3.89 ms, orbital period 9.25 days, eccentricity ∼ 0.95, and an unusually high companion mass of 0.74 assuming a 1.4 pulsar. We caution that the lack of data near periastron prevents a precise measurement of the eccentricity, and that further timing is necessary to constrain this and the other orbital parameters. From tidal considerations, we find that the companion must be a compact object. This system likely formed through an exchange encounter in the dense cluster environment. Our initial timing results predict the measurements of at least two post-Keplerian parameters with long-term phase-connected timing: the rate of periastron advance ~/yr, requiring 1 year of phase connection; and the Einstein delay ∼ 10 ms, requiring 2-3 years of timing. For an orbital inclination, a measurement of is also likely. PSR J1835-3259A thus provides an opportunity to measure the neutron star mass with high precision, to probe the cluster environment, and, depending on the nature of the companion, to investigate the limits of general relativity.

Abstract Copyright:

Journal keyword(s): binaries: close - equation of state - globular clusters: individual: (NGC 6652, NGC 6388) - gravitation - pulsars: individual: NGC 6652A

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 PSR J0514-4002A Psr 05 14 06.6927 -40 02 48.897           ~ 34 1
2 NGC 5456 Sy2 14 04 58.8895891539 +11 52 17.781082976   14.2       ~ 12 0
3 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 652 0
4 PSR B1620-26 Psr 16 23 38.2218 -26 31 53.769     21.30     ~ 277 2
5 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 842 1
6 NGC 6441 GlC 17 50 13.06 -37 03 05.2   9.26 8.00     ~ 807 0
7 PSR J1807-2500B Psr 18 07 20.871209 -25 00 01.91500           ~ 39 0
8 PSR J1835-3259A Psr 18 35 44.856 -32 59 25.08           ~ 6 0
9 NGC 6652 GlC 18 35 45.63 -32 59 26.6   10.64 9.75     ~ 374 0

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2021.11.30-17:28:59

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