2011ApJ...734...79B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST07:24:29

2011ApJ...734...79B - Astrophys. J., 734, 79 (2011/June-3)

Four new black hole candidates identified in M31 globular clusters with Chandra and XMM-Newton.

BARNARD R., GARCIA M., LI Z., PRIMINI F. and MURRAY S.S.

Abstract (from CDS):

We have identified four new black hole candidates (BHCs) in M31 globular clusters (GCs) using 123 Chandra and 4 XMM-Newton observations of the M31 central region. The X-ray source associated with Bo 163 (XB163) is a recurrent transient with the highest observed luminosity, ∼1.4x 1038 erg/s, considerably brighter than any outbursts from neutron star transients Aql X-1 or 4U 1608-452; the outburst apparently started ∼45 days earlier than the observed peak, and hence the luminosity may have been considerably higher. We identified XB082, XB153, and XB185 as BHCs by observing "low state" emission spectra at luminosities that exceed the threshold for neutron star binaries. The probability that these are neutron star systems with anisotropic emission beamed toward us is ≲ 4x10–4, and their variability suggests emission from a single source. We therefore conclude that these systems likely contain black holes rather than neutron stars. We have now identified four persistently bright BHCs in the region; the probability that these are all background active galactic nuclei is ≲ 1x10–20. According to theory, the donors could be tidally captured main-sequence stars or white dwarfs in ultracompact binaries. We find that GCs that are particularly massive (XB082) or metal-rich (XB144) can host bright X-ray sources in addition to GCs that are both (XB163). Our method may reveal BHCs in other bright X-ray sources.

Abstract Copyright:

Journal keyword(s): black hole physics - galaxies: individual: M31 - globular clusters: general - X-rays: binaries - X-rays: general

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME IC 10 X-1 HXB 00 20 29.09 +59 16 51.9           ~ 148 0
2 [FMZ2005] 7 GlC 00 41 43.11 +41 34 20.1 17.090 16.720 15.9 15.190 14.63 ~ 97 0
3 2MASS J00421583+4101142 GlC 00 42 15.84 +41 01 14.3 18.410 17.100 16.13 14.550 13.630 ~ 74 0
4 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10903 1
5 CXOM31 J004253.1+411422 ULX 00 42 53.15 +41 14 22.9           ~ 24 0
6 2MASS J00425986+4116055 GlC 00 42 59.863 +41 16 05.55 18.47 16.860 16.79 15.940 15.74 ~ 57 0
7 2E 153 GlC 00 43 10.621 +41 14 51.31 17.73 17.240 16.13 15.690 14.98 ~ 65 0
8 [JSD2015] AP 2564 GlC 00 43 17.6290874889 +41 27 45.012855603 16.77 16.030 15.00 14.430 13.87 ~ 75 0
9 2MASSI J0043372+411443 GlC 00 43 37.29 +41 14 43.6 16.91 16.480 15.58 14.980 14.47 ~ 69 0
10 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9440 1
11 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1473 1
12 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5665 1
13 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1448 1
14 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1379 0
15 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 1958 2
16 V* QX Nor LXB 16 12 43.0 -52 25 23           ~ 827 1
17 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1737 2
18 X Aql X-1 LXB 19 11 16.0572031521 +00 35 05.876658556           ~ 1011 1

    Equat.    Gal    SGal    Ecl

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2020.07.08-07:24:29

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