2015ApJ...802...85B


Query : 2015ApJ...802...85B

2015ApJ...802...85B - Astrophys. J., 802, 85 (2015/April-1)

XMM-Newton and Chandra observations of the M31 globular cluster black hole candidate XB135: a heavyweight contender cut down to size.

BARNARD R., PRIMINI F., GARCIA M.R., KOLB U.C. and MURRAY S.S.

Abstract (from CDS):

CXOM31 J004252.030+413107.87 is one of the brightest X-ray sources within the D25 region of M31, and associated with a globular cluster known as B135; we therefore call this X-ray source XB135. XB135 is a low-mass X-ray binary (LMXB) that apparently exhibited hard state characteristics at 0.3-10 keV luminosities 4-6 x 1038 erg/s, and the hard state is only observed below ∼10% Eddington. If true, the accretor would be a high-mass black hole (BH) (≳50 M); such a BH may be formed from direct collapse of a metal-poor, high-mass star, and the very low metallicity of B135 (0.015 M) makes such a scenario plausible. We have obtained new XMM-Newton and Chandra HRC observations to shed light on the nature of this object. We find from the HRC observation that XB135 is a single point source located close to the center of B135. The new XMM-Newton spectrum is consistent with a rapidly spinning ∼10-20 M BH in the steep power law or thermal dominant state, but inconsistent with the hard state that we previously assumed. We cannot formally reject three component emission models that have been associated with high luminosity neutron star (NS) LMXBs (known as Z-sources); however, we prefer a BH accretor. We note that deeper observation of XB135 could discriminate against an NS accretor.

Abstract Copyright:

Journal keyword(s): globular clusters: general - globular clusters: individual: B135 - stars: black holes - X-rays: binaries - X-rays: general

Simbad objects: 16

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Number of rows : 16
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 NAME IC 10 X-1 HXB 00 20 29.09 +59 16 51.9           ~ 153 0
2 Bol 45 GlC 00 41 43.11 +41 34 20.1 17.059 16.665 15.727 15.140 14.63 ~ 99 0
3 2E 146 GlC 00 42 34.54 +41 32 51.4 19.006 18.183 16.830 15.910 14.930 ~ 47 0
4 RX J004241+41155 LXB 00 42 38.59 +41 16 03.2           ~ 22 1
5 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11380 1
6 NAME M31* Rad 00 42 44.33 +41 16 08.4           ~ 38 0
7 Bol 135 GlC 00 42 51.983 +41 31 07.96 17.117 16.866 15.953 15.358 14.820 ~ 68 0
8 [FMZ2005] 39 GlC 00 43 01.44 +41 30 17.3     15.44     ~ 35 0
9 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3039 2
10 NAME NGC 300 X-1 HXB 00 55 09.990 -37 42 12.16     22.44     WNE 106 1
11 X LMC X-2 LXB 05 20 28.04 -71 57 53.3 17.20 18.00 18.0     ~ 174 0
12 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15476 1
13 X LMC X-1 HXB 05 39 38.8285930597 -69 44 35.533031148   14.8 14.5     O8(f)p 582 2
14 [KRL2007b] 214 LXB 17 00 58.46 -46 11 08.6           ~ 210 0
15 V* NP Ser LXB 18 16 01.389 -14 02 10.62   18.8       K 611 2
16 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2389 0

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2021.08.05-01:23:20

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