2012ApJ...757...40B


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET18:29:26

2012ApJ...757...40B - Astrophys. J., 757, 40 (2012/September-3)

12 years of X-ray variability in M31 globular clusters, including 8 black hole candidates, as seen by Chandra.

BARNARD R., GARCIA M. and MURRAY S.S.

Abstract (from CDS):

We examined 134 Chandra observations of the population of X-ray sources associated with globular clusters (GCs) in the central region of M31. These are expected to be X-ray binary systems (XBs), consisting of a neutron star or black hole accreting material from a close companion. We created long-term light curves for these sources, correcting for background, interstellar absorption, and instrumental effects. We tested for variability by examining the goodness of fit for the best-fit constant intensity. We also created structure functions (SFs) for every object in our sample, the first time this technique has been applied to XBs. We found significant variability in 28 out of 34 GCs and GC candidates; the other 6 sources had 0.3-10 keV luminosities fainter than ∼2x1036 erg/s, limiting our ability to detect similar variability. The SFs of XBs with 0.3-10 keV luminosities ∼2-50x1036 erg/s generally showed considerably more variability than the published ensemble SF of active galactic nuclei (AGNs). Our brightest XBs were mostly consistent with the AGN SF; however, their 2-10 keV fluxes could be matched by <1 AGN per square degree. These encouraging results suggest that examining the long-term light curves of other X-ray sources in the field may provide an important distinction between X-ray binaries and background galaxies, as the X-ray emission spectra from these two classes of X-ray sources are similar. Additionally, we identify 3 new black hole candidates (BHCs) using additional XMM-Newton data, bringing the total number of M31 GC BHCs to 9, with 8 covered in this survey.

Abstract Copyright:

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

Simbad objects: 45

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Number of rows : 45

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 [KLG2007] GC2 81 * 00 41 37.3881776295 +40 59 19.195865878   16.14 15.60 15.27 14.977 ~ 6 0
2 Bol 45 GlC 00 41 43.11 +41 34 20.1 17.059 16.665 15.727 15.140 14.63 ~ 98 0
3 2MASS J00420608+4102477 G 00 42 06.080 +41 02 47.73 19.911 20.009 18.975 18.347 17.611 ~ 22 0
4 2MASS J00420711+4100165 G 00 42 07.111 +41 00 16.55 21.062 20.208 18.673 17.833   ~ 22 0
5 2MASS J00421215+4117588 GlC 00 42 12.151 +41 17 58.80 20.138 19.220 17.817 16.911 16.174 ~ 40 0
6 2MASS J00421583+4101142 GlC 00 42 15.836 +41 01 14.28 18.082 16.972 15.465 14.497 13.630 ~ 75 0
7 2MASS J00421865+4114021 GlC 00 42 18.653 +41 14 02.13 15.985 15.899 15.131 14.661 13.920 ~ 73 0
8 2MASS J00421972+4121539 GlC 00 42 19.722 +41 21 53.99           ~ 10 0
9 [JSD2015] AP 8593 GlC 00 42 21.562 +41 14 19.67 20.57 19.611 18.567 17.923 17.155 ~ 14 0
10 RX J004222.8+411536 XB* 00 42 22.919 +41 15 35.14           ~ 21 0
11 2MASS J00422504+4057176 GlC 00 42 25.043 +40 57 17.61 17.045 16.490 15.531 14.950 14.290 ~ 56 0
12 2MASS J00422608+4119147 GlC 00 42 26.080 +41 19 14.79 18.796 17.863 16.635 15.857 15.188 ~ 66 0
13 2MASS J00422739+4059358 GlC 00 42 27.395 +40 59 35.86 17.532 17.139 16.236 15.692 15.110 ~ 42 0
14 2MASS J00423125+4119388 GlC 00 42 31.255 +41 19 38.87 17.00 16.725 15.764 15.171 14.681 ~ 69 0
15 2MASS J00423310+4103283 GlC 00 42 33.105 +41 03 28.36 16.430 16.036 15.163 14.619 14.000 ~ 69 0
16 [FMZ2005] 24 GlC 00 42 34.37 +40 57 09.3 17.440 16.990 16.88 15.900 15.340 ~ 47 0
17 2MASS J00424066+4110333 GlC 00 42 40.667 +41 10 33.31 18.632 18.231 17.321 16.738 16.116 ~ 45 0
18 2MASS J00424144+4115236 GlC 00 42 41.440 +41 15 23.66 16.153 15.589 14.73 14.060 13.74 ~ 64 0
19 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11217 1
20 NAME PB-in7 GlC 00 42 46.09 +41 17 36.0 20.30 18.975 18.093 17.560 17.48 ~ 28 0
21 2XMM J004247.6+411113 GlC 00 42 47.81 +41 11 13.8 18.445 17.932 16.999 16.437 15.760 ~ 39 0
22 NAME PB-in2 GlC 00 42 50.72 +41 10 33.5   19.177 18.10   16.886 ~ 24 0
23 Bol 135 GlC 00 42 51.983 +41 31 07.96 17.117 16.866 15.953 15.358 14.820 ~ 68 0
24 2XMM J004255.2+411835 GlC 00 42 55.6079933769 +41 18 35.083794274 18.668 17.917 16.917 16.321 15.782 ~ 40 0
25 2MASS J00425965+4119192 GlC 00 42 59.651 +41 19 19.29 17.800 17.075 16.087 15.486 14.94 ~ 79 0
26 2MASS J00425986+4116055 GlC 00 42 59.863 +41 16 05.55 18.47 17.691 16.727 16.153 15.74 ~ 58 0
27 [FMZ2005] 39 GlC 00 43 01.44 +41 30 17.3     15.44     ~ 35 0
28 2MASS J00430292+4115225 GlC 00 43 02.921 +41 15 22.51 18.34 17.851 16.930 16.348 15.870 ~ 56 1
29 2MASS J00430330+4121215 GlC 00 43 03.307 +41 21 21.53 17.188 16.563 15.594 15.003 14.73 ~ 68 0
30 2MASS J00430386+4118047 GlC 00 43 03.864 +41 18 04.72 16.80 16.623 15.799 15.284 14.869 ~ 78 0
31 2MASS J00430751+4120194 GlC 00 43 07.516 +41 20 19.50 18.275 17.644 16.665 16.059 15.508 ~ 43 0
32 2MASS J00430986+4119006 Gl? 00 43 09.865 +41 19 00.68 19.586 18.829 17.723 17.045 16.452 ~ 34 0
33 2E 153 GlC 00 43 10.621 +41 14 51.31 17.726 17.117 16.148 15.553 14.98 ~ 66 0
34 Bol 158 GlC 00 43 14.406 +41 07 21.28 15.900 15.560 14.65 14.150 13.550 ~ 113 1
35 2MASS J00431464+4125133 GlC 00 43 14.646 +41 25 13.37 19.31 18.080 17.35 16.530 16.12 ~ 36 0
36 2MASS J00431541+4111251 GlC 00 43 15.416 +41 11 25.15 17.363 17.133 16.291 15.807 15.415 ~ 54 0
37 [JSD2015] AP 2564 GlC 00 43 17.6290874889 +41 27 45.012855603 16.77 16.030 15.00 14.430 13.87 ~ 75 0
38 2MASS J00433667+4108121 GlC 00 43 36.672 +41 08 12.16 16.608 16.266 15.314 14.820 14.27 ~ 61 0
39 2MASSI J0043372+411443 GlC 00 43 37.286 +41 14 43.56 16.910 16.475 15.543 14.982 14.47 ~ 70 0
40 2MASS J00435642+4122027 GlC 00 43 56.428 +41 22 02.79 17.011 16.574 15.652 15.170 14.62 ~ 51 0
41 V* QX Nor LXB 16 12 43.0 -52 25 23           ~ 846 1
42 IGR J17480-2446 LXB 17 48 04.831 -24 46 48.87           ~ 156 0
43 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 717 1
44 X Aql X-1 LXB 19 11 16.0572031521 +00 35 05.876658556           ~ 1034 1
45 V* V1341 Cyg LXB 21 44 41.1544523872 +38 19 17.065856122 15.00 15.13 14.68 15.00   A9III 1091 1

    Equat.    Gal    SGal    Ecl

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2021.03.05-18:29:26

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