2006ApJ...636L..41M


Query : 2006ApJ...636L..41M

2006ApJ...636L..41M - Astrophys. J., 636, L41-L44 (2006/January-1)

A neutron star with a massive progenitor in Westerlund 1.

MUNO M.P., CLARK J.S., CROWTHER P.A., DOUGHERTY S.M., DE GRIJS R., LAW C., McMILLAN S.L.W., MORRIS M.R., NEGUERUELA I., POOLEY D., PORTEGIES ZWART S. and YUSEF-ZADEH F.

Abstract (from CDS):

We report the discovery of an X-ray pulsar in the young, massive Galactic star cluster Westerlund 1. We detected a coherent signal from the brightest X-ray source in the cluster, CXO J164710.2-455216, during two Chandra observations on 2005 May 22 and June 18. The period of the pulsar is 10.6107(1) s. We place an upper limit to the period derivative of P{dot}<2x10–10 s/s, which implies that the spin-down luminosity is E{dot}≤3x1033 ergs/s. The X-ray luminosity of the pulsar is LX~3+10–2x1033(D/5 kpc)2 ergs/s, and the spectrum can be described by a kT=0.61+0.02–0.02 keV blackbody with a radius of Rbb=0.27±0.03(D/5 kpc) km. Deep infrared observations reveal no counterpart with K<18.5, which rules out a binary companion with M>1 M. Taken together, the properties of the pulsar indicate that it is a magnetar. The rarity of slow X-ray pulsars and the position of CXO J164710.2-455216 only 1'.6 from the core of Westerlund 1 indicates that it is a member of the cluster with >99.97% confidence. Westerlund 1 contains 07 V stars with initial masses Mi~35 Mand >50 post-main-sequence stars that indicate the cluster is 4±1 Myr old. Therefore, the progenitor to this pulsar had an initial mass Mi>40 M. This is the most secure result among a handful of observational limits to the masses of the progenitors to neutron stars.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual (Westerlund 1) - Stars: Neutron - X-Rays: Stars

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* V635 Cas HXB 01 18 31.9704429246 +63 44 33.071137750 17.05 16.64 15.19 14.34 13.22 B0.2Ve 676 0
2 V* X Per HXB 03 55 23.0778791365 +31 02 45.045745259 6.090 6.840 6.720     O9.5III 923 0
3 HD 245770 HXB 05 38 54.5749436467 +26 18 56.839215267 9.30 9.84 9.39 8.77 8.30 O9/B0III/Ve 891 0
4 2E 2336 HXB 10 50 08.93 -59 53 19.9           Be 386 0
5 Cl Westerlund 1 OpC 16 47 04.00 -45 51 04.9           ~ 494 0
6 PSR J1647-4552 Psr 16 47 10.18 -45 52 16.7           ~ 182 1
7 PSR J1808-2024 Psr 18 08 39.32 -20 24 40.1           ~ 1141 2
8 GBS 1900+14 gB 19 07 13 +09 19.6           ~ 803 0

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2021.07.31-08:37:11

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