2013ApJ...769...92P

Query : 2013ApJ...769...92P

2013ApJ...769...92P - Astrophys. J., 769, 92 (2013/June-1)

Ultra-luminous X-ray sources in the most metal poor galaxies.

PRESTWICH A.H., TSANTAKI M., ZEZAS A., JACKSON F., ROBERTS T.P., FOLTZ R., LINDEN T. and KALOGERA V.

Abstract (from CDS):

Ultra-luminous X-ray sources (ULX) are X-ray binaries with Lx>1039 erg/s. The most spectacular examples of ULX occur in starburst galaxies and are now understood to be young, luminous high mass X-ray binaries. The conditions under which ULX form are poorly understood, but recent evidence suggests they may be more common in low metallicity systems. Here we investigate the hypothesis that ULX form preferentially in low metallicity galaxies by searching for ULX in a sample of extremely metal poor galaxies (XMPG) observed with the Chandra X-Ray Observatory. XMPG are defined as galaxies with log(O/H) + 12 < 7.65, or less than 5% solar. These are the most metal-deficient galaxies known, and a logical place to find ULX if they favor metal poor systems. We compare the number of ULX (corrected for background contamination) per unit of star formation (NULX(SFR)) in the XMPG sample with NULX(SFR) in a comparison sample of galaxies with higher metallicities taken from the Spitzer Infrared Galaxy Sample. We find that ULX occur preferentially in the metal poor sample with a formal statistical significance of 2.3σ. We do not see strong evidence for a trend in the formation of ULX in the high metallicity sample: above 12+log(O/H) ∼ 8.0 the efficiency of ULX production appears to be flat. The effect we see is strongest in the lowest metallicity bin. We discuss briefly the implications of these results for the formation of black holes in low metallicity gas.

Abstract Copyright: ∼

Journal keyword(s): stars: formation - X-rays: binaries

Simbad objects: 53

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Number of rows : 53
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 MCG-06-02-022a EmG 00 37 41.1133192392 -33 42 58.515101748   19.26   18.52   ~ 314 1
2 MCG+00-04-043 LSB 01 13 40.450 +00 52 39.16   17       ~ 65 0
3 LEDA 7896 AG? 02 04 25.598 -10 09 35.01   17       ~ 21 0
4 NGC 922 EmG 02 25 04.400 -24 47 17.46   12.54 12.21 11.84   ~ 161 1
5 NGC 925 H2G 02 27 16.913 +33 34 43.97   10.69 10.12 9.55   ~ 818 1
6 [PBT2001] SBSG 0335-052 W G 03 37 38.40 -05 02 37.5   19.14     18.85 ~ 110 1
7 SBSG 0335-052 AGN 03 37 44.06 -05 02 40.2     16.65     ~ 500 1
8 LEDA 132213 EmG 04 05 20.4 -36 48 59           ~ 24 0
9 NGC 1705 Sy2 04 54 13.4661493464 -53 21 39.471592428 12.32 12.96 12.56 12.58 12.9 ~ 692 1
10 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1887 1
11 Z 262-28 AG? 07 47 31.944 +51 11 28.95   14.8       ~ 33 0
12 SDSS J081239.52+483645.3 bCG 08 12 39.532 +48 36 45.27           ~ 25 0
13 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 812 2
14 LEDA 2790884 QSO 08 25 55.5166210656 +35 32 31.833368556   18.2       ~ 128 1
15 Z 311-8 GiG 08 34 07.20 +66 10 54.0 15.39 15.03 14.70 14.49   ~ 357 2
16 SDSS J085947.03+392302.6 GiP 08 59 47.040 +39 23 02.67           ~ 11 0
17 NGC 2841 LIN 09 22 02.6778711696 +50 58 35.737082868 10.43 10.09 9.22     ~ 1113 1
18 Mrk 116 AGN 09 34 02.1 +55 14 25           ~ 1179 1
19 LEDA 27591 SBG 09 40 12.843 +29 35 30.30   16.32 16.08     ~ 65 0
20 LEDA 27886 QSO 09 44 17.101 +54 11 28.83   19.5       ~ 72 0
21 LEDA 28037 AG? 09 46 22.843 +54 52 08.27   16       ~ 15 0
22 NGC 2976 GiG 09 47 15.458 +67 54 58.97 11.77 11.03 10.16 9.51   ~ 712 1
23 MCG+12-10-012 AG? 09 57 32.8632 +69 02 50.735 15.19 15.15 14.10 14.12   ~ 327 4
24 LEDA 29998 AGN 10 16 24.516 +37 54 45.96   16.5       ~ 62 0
25 NGC 3180 GiG 10 18 16.985 +41 25 27.77   10.4       ~ 777 0
26 NGC 3198 EmG 10 19 54.990 +45 32 58.88 10.83 10.87 10.33     ~ 946 1
27 IC 2574 AG? 10 28 23.6148831408 +68 24 43.440012756 11.70 11.07 10.87 10.74   ~ 703 1
28 M 95 GiP 10 43 57.7313485800 +11 42 13.301191332 10.71 10.51 9.73 9.48   ~ 1238 2
29 MCG+10-16-059 AG? 11 05 53.6921585616 +60 22 28.499349252   16       ~ 25 0
30 NAME Arp's Galaxy AG? 11 19 34.344 +51 30 12.17   17.3       ~ 78 0
31 M 66 AGN 11 20 15.0 +12 59 29 9.85 9.65 8.92     ~ 1509 4
32 MCG+10-17-011 AG? 11 32 02.6164558680 +57 22 36.292387908   17       ~ 64 1
33 LEDA 3120683 EmG 12 01 22.3051558008 +02 11 08.574134388           ~ 44 0
34 NGC 4236 GiG 12 16 42.118 +69 27 45.25 10.97 10.58 10.08 9.90   ~ 415 1
35 RMB 132 bCG 12 30 48.6089418912 +12 02 42.805457196     16.78   16.44 ~ 102 0
36 NGC 4559 H2G 12 35 57.6402869976 +27 57 35.859278160   10.46 10.01     ~ 667 1
37 M 90 Sy2 12 36 49.8009839880 +13 09 46.523813040 10.56 10.26 9.54     ~ 953 1
38 NAME CVn I dwA GiC 12 38 40.06 +32 46 00.5 16.91 16.66 16.73 16.62   ~ 242 0
39 NGC 4625 SyG 12 41 52.7121819576 +41 16 26.115765780 12.74 12.92 12.35     ~ 383 2
40 M 94 SyG 12 50 53.0737971432 +41 07 12.900884628 9.15 8.96 8.24 7.78   ~ 1476 2
41 M 64 SyG 12 56 43.696 +21 40 57.57   9.36 8.52     ~ 1010 2
42 M 63 LIN 13 15 49.2741893928 +42 01 45.728076108   9.34 8.59 8.35   ~ 1292 2
43 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
44 NGC 5408 EmG 14 03 20.907 -41 22 39.75   12.59   11.96 12.2 ~ 368 3
45 2dFGRS TGN206Z232 bCG 14 14 54.149 -02 08 22.92   18.065   17.598   ~ 25 0
46 Z 219-66 QSO 14 17 01.716 +43 30 13.52   15.6       ~ 181 0
47 MCG+07-30-055 H2G 14 44 12.8032800372 +42 37 43.773570223   16.0       ~ 92 0
48 IC 4710 AG? 18 28 37.969 -66 58 56.20   12.53   11.33 12.4 ~ 112 1
49 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
50 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2661 2
51 LEDA 1139658 G 21 04 55.310 -00 35 22.38           ~ 33 0
52 NAME Kinman Dwarf bCG 22 30 36.7959714600 -00 06 36.924915456 16.85 17.35 16.87   16.65 ~ 67 2
53 NGC 7331 LIN 22 37 04.0506038088 +34 24 56.800076508 10.65 10.35 9.48     ~ 1284 2

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