2004ApJ...616..821T


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.29CET21:51:06

2004ApJ...616..821T - Astrophys. J., 616, 821-844 (2004/December-1)

M31 globular cluster X-ray sources: XMM-newton and Chandra results.

TRUDOLYUBOV S. and PRIEDHORSKY W.

Abstract (from CDS):

We present the results of an M31 globular cluster (GC) X-ray source survey, based on the data of XMM-Newton and Chandra observations covering ∼6100 arcmin2 of M31. We detected 43 X-ray sources coincident with GC candidates from various optical surveys. The inferred isotropic X-ray luminosities of GC sources lie between ∼1035 and ∼1039 ergs/s in the 0.3-10 keV energy band. The spectral properties of the 31 brightest sources in our sample were found to be similar to those of the low-mass X-ray binaries (LMXBs) located in the bulge and the GCs of the Milky Way. The spectral distribution of the M31 GC X-ray sources is consistent with that derived for the bulge of M31 and other nearby galaxies of different morphological type. Several sources demonstrate a correlation between the level of X-ray flux and the hardness of their energy spectrum reminiscent of the Galactic Z and atoll sources. We found that ∼80% of the M31 GC sources with multiple flux measurements available show significant variability on timescales from days to years. The X-ray source RX J0043.2+4127, coincident with GC Bo 163, has been found to show recurrent transient outbursts with peak luminosities of ∼1038 ergs/s. Several sources in our sample show significant variability on a timescale of individual observations, ranging from aperiodic fluctuations to regular dipping. The X-ray luminosity function of GC sources is found to be significantly different from that of the point sources in the bulge and disk of M31. The luminosity distribution of M31 GC sources has ∼10 times higher peak luminosity and a much higher fraction of bright sources than the Milky Way GC distribution. Six persistent sources in our sample (or ∼14% of the total number) have luminosities exceeding 1038 ergs/s during all observations, and three other sources occasionally exceed that luminosity level. Our observations indicate that GC sources make the dominant contribution to the bright source counts in the areas of M31 covered by the survey: ∼40% of the total number of sources with luminosities above 1037 ergs/s reside in GCs, with the fraction of GC sources rising to 67%-90% for luminosities above 1038 ergs/s. The contribution of the GC sources to the total number of bright sources found in M31 is much higher than in the Milky Way but surprisingly close to that of early-type galaxies. We found that the brightest M31 GC sources tend to reside at large galactocentric distances outside the central bulge. We found that GCs hosting bright X-ray sources are optically brighter and more metal-rich than the rest of the M31 GCs, in agreement with previous studies. The brightest sources, with luminosities above ∼1038 ergs/s, show a tendency to reside in more metal-poor clusters. The remarkable similarities between the properties of the M31 GC X-ray sources and those of Galactic neutron star LMXBs lead us to expect most of the persistent M31 GC X-ray sources to be LMXB systems with neutron star primaries. However, the current X-ray spectral and timing data cannot rule out the possibility of finding active accreting black holes in our GC source sample.

Abstract Copyright:

Journal keyword(s): Galaxies: Individual: Messier Number: M31 - Galaxies: Star Clusters - Galaxy: Globular Clusters: General - X-Rays: Galaxies

Nomenclature: Table 3: [TP2004] NN (Nos 1-43).

CDS comments: Par. 6.2, 4U 1630-40 is a misprint for 4U 1630-47

Simbad objects: 54

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Number of rows : 54

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 Mayall II GlC 00 32 46.53 +39 34 40.5   14.564 13.807 13.208 12.684 ~ 371 1
2 2E 114 GlC 00 40 20.319 +40 43 58.31 16.880 16.552 15.529 14.895 14.400 ~ 61 0
3 2MASS J00414099+4104059 GlC 00 41 40.9936951013 +41 04 05.777933964 20.832 20.285 18.743 17.955 17.200 ~ 10 0
4 2MASS J00415039+4112124 GlC 00 41 50.392 +41 12 12.48 19.134 18.079 16.777 15.937 15.075 ~ 37 0
5 2MASS J00415300+4047096 GlC 00 41 53.008 +40 47 09.65 15.986 15.776 14.967 14.474 14.03 ~ 75 0
6 2MASS J00420608+4102477 G 00 42 06.080 +41 02 47.73 19.911 20.009 18.975 18.347 17.611 ~ 22 0
7 2MASS J00420711+4100165 G 00 42 07.111 +41 00 16.55 21.062 20.208 18.673 17.833   ~ 22 0
8 2MASSI J0042094+411745 GlC 00 42 09.498 +41 17 45.60 20.017 18.621 17.069 16.064   ~ 24 0
9 2MASS J00421215+4117588 GlC 00 42 12.151 +41 17 58.80 20.138 19.220 17.817 16.911 16.174 ~ 40 0
10 2MASS J00421583+4101142 GlC 00 42 15.836 +41 01 14.28 18.082 16.972 15.465 14.497 13.630 ~ 75 0
11 2MASS J00421865+4114021 GlC 00 42 18.653 +41 14 02.13 15.985 15.899 15.131 14.661 13.920 ~ 73 0
12 2MASS J00421972+4121539 GlC 00 42 19.722 +41 21 53.99           ~ 10 0
13 XMMU J004301.3+413017 GlC 00 42 21.71 +41 22 05.4 18.459 18.360 17.912 17.651 17.363 ~ 33 1
14 2MASS J00422504+4057176 GlC 00 42 25.043 +40 57 17.61 17.045 16.490 15.531 14.950 14.290 ~ 56 0
15 2MASS J00422608+4119147 GlC 00 42 26.080 +41 19 14.79 18.796 17.863 16.635 15.857 15.188 ~ 66 0
16 2MASS J00422739+4059358 GlC 00 42 27.395 +40 59 35.86 17.532 17.139 16.236 15.692 15.110 ~ 42 0
17 2MASS J00423125+4119388 GlC 00 42 31.255 +41 19 38.87 17.00 16.725 15.764 15.171 14.681 ~ 69 0
18 2MASS J00423310+4103283 GlC 00 42 33.105 +41 03 28.36 16.430 16.036 15.163 14.619 14.000 ~ 69 0
19 [FMZ2005] 24 GlC 00 42 34.37 +40 57 09.3 17.440 16.990 16.88 15.900 15.340 ~ 47 0
20 RX J004241+41155 LXB 00 42 38.59 +41 16 03.2           ~ 21 1
21 2MASS J00424066+4110333 GlC 00 42 40.667 +41 10 33.31 18.632 18.231 17.321 16.738 16.116 ~ 45 0
22 2MASS J00424144+4115236 GlC 00 42 41.440 +41 15 23.66 16.153 15.589 14.73 14.060 13.74 ~ 64 0
23 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11057 1
24 NAME PB-in2 GlC 00 42 50.72 +41 10 33.5   19.177 18.10   16.886 ~ 24 0
25 Bol 135 GlC 00 42 51.983 +41 31 07.96 17.117 16.866 15.953 15.358 14.820 ~ 68 0
26 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
27 2MASS J00425965+4119192 GlC 00 42 59.651 +41 19 19.29 17.800 17.075 16.087 15.486 14.94 ~ 79 0
28 2MASS J00425986+4116055 GlC 00 42 59.863 +41 16 05.55 18.47 17.691 16.727 16.153 15.74 ~ 58 0
29 2MASS J00430292+4115225 GlC 00 43 02.921 +41 15 22.51 18.34 17.851 16.930 16.348 15.870 ~ 56 1
30 2MASS J00430330+4121215 GlC 00 43 03.307 +41 21 21.53 17.188 16.563 15.594 15.003 14.73 ~ 68 0
31 2MASS J00430386+4118047 GlC 00 43 03.864 +41 18 04.72 16.80 16.623 15.799 15.284 14.869 ~ 78 0
32 2MASS J00430751+4120194 GlC 00 43 07.516 +41 20 19.50 18.275 17.644 16.665 16.059 15.508 ~ 43 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 J00434296+4128500 GlC 00 43 42.967 +41 28 50.02   19.7 18.5 17.7 17.23 ~ 12 0
41 2MASX J00434551+4136578 GlC 00 43 45.503 +41 36 57.48 16.746 16.097 15.193 14.565 14.18 ~ 84 0
42 2MASS J00435642+4122027 GlC 00 43 56.428 +41 22 02.79 17.011 16.574 15.652 15.170 14.62 ~ 51 0
43 2E 166 GlC 00 44 29.560 +41 21 35.72 15.50 15.000 14.220 13.679 13.02 ~ 125 0
44 2E 169 GlC 00 45 45.5771241125 +41 39 42.245792605 18.80 18.317 17.471 16.958 16.386 ~ 57 0
45 BA 3-8 GlC 00 46 27.016 +42 01 52.75 16.554 16.355 15.541 14.997 14.435 ~ 86 0
46 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1463 1
47 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 1971 2
48 V* V822 Cen LXB 14 58 21.9350279092 -31 40 07.515505032 11.95 12.85 12.8     K3-K7V 511 0
49 V* V818 Sco LXB 16 19 55.0688745859 -15 38 25.019920749 11.60 12.40 11.1     Oev 1531 0
50 X Nor X-1 LXB 16 34 01.610 -47 23 34.80           ~ 424 0
51 4U 1758-25 LXB 18 01 09.7308941918 -25 04 44.128444504           ~ 616 1
52 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 780 1
53 X Sgr X-4 LXB 18 23 40.57 -30 21 40.6   19.06 18.81     ~ 906 1
54 Granat 1915+105 LXB 19 15 11.54938 +10 56 44.7585           ~ 2310 0

    Equat.    Gal    SGal    Ecl

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2020.10.29-21:51:06

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