2001ApJ...554...27H

Query : 2001ApJ...554...27H

2001ApJ...554...27H - Astrophys. J., 554, 27-42 (2001/June-2)

The hard X-ray luminosity of OB star populations: implications for the contribution of star formation to the cosmic X-ray background.

HELFAND D.J. and MORAN E.C.

Abstract (from CDS):

We present an empirical analysis of the integrated X-ray luminosity arising from populations of OB stars. In particular, we utilize results from the All-Sky Monitor on RXTE, along with archival data from previous missions, to assess the mean integrated output of X-rays in the 2-10 keV band from accreting early-type binaries within 3 kpc of the Sun. Using a recent OB star census of the solar neighborhood, we then calculate the specific X-ray luminosity per O star from accretion-powered systems. We also assess the contribution to the total X-ray luminosity of an OB population from associated T Tauri stars, stellar winds, and supernovae. We repeat this exercise for the major Local Group galaxies, concluding that the total X-ray luminosity per O star spans a broad range from 2 to 20x1034 ergs.s–1. Contrary to previous results, we do not find a consistent trend with metallicity; in fact, the specific luminosities for M31 and the SMC are equal, despite having metallicities that differ by an order of magnitude. In light of these results, we assess the fraction of the observed 2-10 keV emission from starburst galaxies that arises directly from their OB star populations, concluding that, while binaries can explain most of the hard X-ray emission in many local starbursts, a significant additional component or components must be present in some systems. A discussion of the nature of this additional emission, along with its implications for the contribution of starbursts to the cosmic X-ray background, concludes our report.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Starburst - Galaxies: Local Group - Stars: Early-Type - ISM: Supernova Remnants - X-Rays: Galaxies - X-Rays: Stars

CDS comments: Table 1 : 1846-03, 1901+03 and 1948+32 not identified

Simbad objects: 87

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Number of rows : 87
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12678 1
2 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3344 2
3 LIN 198 HXB 00 52 05.6251611744 -72 26 04.228773036 13.86 14.91 14.927 14.91 14.794 B0-5(II)e 167 0
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11178 1
5 X SMC X-2 HXB 00 54 33.43 -73 41 01.3 13.77 16.40 16.38   14.67 O9.5III-V 133 0
6 * gam Cas HXB 00 56 42.5310945 +60 43 00.264089 1.18 2.29 2.39 2.32 2.40 B0.5IVpe 1209 0
7 RX J0111.2-7317 HXB 01 11 08.5770101712 -73 16 46.308129384 14.40 15.42 15.52   15.29 B0.5-1Ve 71 0
8 SK 160 HXB 01 17 05.1457288392 -73 26 36.014808156 12.23 13.00 13.15   13.17 O9.7Ia+ 860 0
9 V* V662 Cas HXB 01 18 02.6976641952 +65 17 29.829200388 12.27 11.99 11.14 10.33 9.58 B1Iae 272 0
10 V* V635 Cas HXB 01 18 31.9704955824 +63 44 33.072603144 17.05 16.64 15.19 14.34 13.22 B0.2Ve 746 0
11 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5847 1
12 EM* GGA 104 HXB 01 47 00.2124077208 +61 21 23.663788056 11.76 12.09 11.366 11.00 10.52 B1IIIe 191 0
13 SNR G130.7+03.1 SNR 02 05 37.0 +64 49 42           ~ 620 4
14 LS I +61 303 HXB 02 40 31.6644419688 +61 13 45.593918580 11.27 11.61 10.75 10.19 9.55 B0Ve 853 2
15 V* X Per HXB 03 55 23.0777456088 +31 02 45.039836148 6.090 6.840 6.720     O9.5III 979 0
16 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1243 3
17 LS V +44 17 HXB 04 40 59.3296237272 +44 31 49.258049376 11.02 11.42 10.73 10.28 9.76 B0.2Ve 140 0
18 NGC 1808 Sy2 05 07 42.343 -37 30 46.98 11.05 10.80 9.94 9.36 10.2 ~ 723 3
19 X LMC X-2 LXB 05 20 28.04 -71 57 53.3 17.20 18.00 18.0     ~ 184 0
20 HD 34921 HXB 05 22 35.2313961840 +37 40 33.638562768 6.78 7.64 7.48     B0IVpe 133 0
21 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17478 0
22 X LMC X-4 HXB 05 32 49.5556042296 -66 22 13.202721768   13.9 14.0     O8III 670 0
23 M 1 SNR 05 34 30.9 +22 00 53           ~ 6202 1
24 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5268 0
25 NAME Ori Complex Cld 05 35.3 -05 23           ~ 441 0
26 HD 245770 HXB 05 38 54.5748918624 +26 18 56.836952784 9.30 9.84 9.39 8.77 8.30 O9/B0III/Ve 985 0
27 PSR B0540-69 Psr 05 40 11.2000490438 -69 19 54.198559829           ~ 905 3
28 HD 249179 bC? 05 55 55.0408392960 +28 47 06.421864164   10.11 10.00     B5ne 41 1
29 NGC 2146 SBG 06 18 37.710 +78 21 25.27 11.67 11.38 10.59     ~ 723 2
30 HD 63666 HXB 07 47 23.5848942480 -53 19 56.822589048   7.60 7.60     B7IV/V 36 0
31 HD 65663 Be* 07 56 15.7697008 -61 05 57.949993 6.54 6.723 6.730     B8V 51 1
32 V* GP Vel HXB 09 02 06.8608812864 -40 33 16.899168060 6.85 7.37 6.87 6.31 6.05 B0.5Ia 1505 0
33 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5869 6
34 GRO J1008-571 HXB 10 09 46.9642314696 -58 17 35.603851848       14.63   B0e 238 0
35 NGC 3256 Sy2 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 850 2
36 HD 91188 Be* 10 30 22.4122667064 -57 04 38.604393876 5.98 6.491 6.615     B5IIIe 52 0
37 LS 1698 HXB 10 37 35.3145142200 -56 47 55.869594756   12.00 11.48 11.38   B0III/V:e 109 0
38 NGC 3310 AGN 10 38 45.85707 +53 30 11.8940   12.45 12.15     ~ 774 1
39 WRAY 15-793 HXB 11 20 57.1736884968 -61 55 00.166078020 12.81 13.06 12.12     O9.5III/Ve 208 0
40 NGC 3690 IG 11 28 31.0 +58 33 41   13.19 12.86     ~ 978 4
41 NAME NGC 3690 West GiP 11 28 31.02 +58 33 40.7   11.8       ~ 630 4
42 NAME NGC 3690 East AGN 11 28 33.07 +58 33 54.2   11.8       ~ 631 4
43 HD 102567 HXB 11 48 00.0214464120 -62 12 24.902384760 8.24 9.06 9.00 9.62   B1Vne 319 0
44 V* BP Cru HXB 12 26 37.5605188992 -62 46 13.261044684   12.482 10.803 10.304   B1Ia+ 689 0
45 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1127 1
46 HD 109857 Be* 12 39 14.57557 -75 22 14.1384 6.33         B8Vn 69 0
47 1H 1238-599 HXB 12 42 01.7 -60 12 06     13.80     ~ 32 0
48 HD 110432 HXB 12 42 50.2663572384 -63 03 31.052981412 4.79 5.58 5.31     B0.5IVpe 311 0
49 1A 1244-60 HXB 12 47 35 -60 38.6           ~ 9 0
50 4U 1246-58 LXB 12 49 39.364 -59 05 14.68   19.24 18.99     ~ 96 0
51 * mu.02 Cru Be* 12 54 36.8841589536 -57 10 07.193918388 4.59 5.09 5.20 5.00 5.06 B5Vne 179 0
52 V* V850 Cen HXB 13 01 17.0968941216 -61 36 06.637549788   15.6 14.40     B2Vne 333 0
53 CPD-63 2495 HXB 13 02 47.6544015048 -63 50 08.626970292 10.34 10.72 9.98 10.03   O9.5Ve 793 0
54 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2580 2
55 NGC 5408 EmG 14 03 20.907 -41 22 39.75   12.59   11.96 12.2 ~ 351 3
56 4U 1416-62 HXB 14 21 12.1560262026 -62 41 56.089360085   17.9 17.2     B1:V:e 157 0
57 SNR G320.4-01.0 SNR 15 13 35 -59 00.2           ~ 84 0
58 HD 141926 HXB 15 54 21.7677373488 -55 19 44.310748620 8.71 9.47 9.13 9.38   B2IIIn 75 0
59 HD 153919 HXB 17 03 56.7725629224 -37 50 38.913331452 6.06 6.78 6.51 6.08 5.90 O6Iafcp 814 1
60 2MASS J17251139-3616575 HXB 17 25 11.392 -36 16 57.53     14.30     B0-1Ia 126 2
61 HD 161103 HXB 17 44 45.7656635952 -27 13 44.478959340 8.44 9.23 9.13 9.12   B0.5III/IVe 82 0
62 4U 1807-10 HXB 18 10.7 -10 52   17.36 16.40     ~ 18 0
63 SAX J1818.6-1703 HXB 18 18 37.8984077808 -17 02 47.967846180           OBI 106 0
64 V* V479 Sct HXB 18 26 15.0561548880 -14 50 54.247274304 12.02 12.23 11.27 11.04   ON6V((f))z 573 2
65 X Sct X-1 HXB 18 35 25.8244223112 -07 36 50.416365528           ~ 82 0
66 1RXS J184135.3-055032 HXB 18 41.7 -05 54           ~ 11 0
67 Ginga 1839-04 HXB 18 41.8 -04 30           ~ 10 0
68 V* FT Sct cC* 18 44 38.1739964496 -04 24 57.927128652         11.261 ~ 11 0
69 IGR J18450-0435 HXB 18 45 01.5900617304 -04 33 56.643032844   16.278 14.115 13.467 11.42 O9.5I 91 0
70 Ginga 1843+009 HXB 18 45 36.8356591776 +00 51 47.437790184     20.6   16.616 B0-2IV-Ve 112 0
71 SNR G029.7-00.2 SNR 18 46 22.8 -02 59 47           ~ 351 2
72 XTE J1855-026 HXB 18 55 30.4058947392 -02 36 16.737653700   16.451 14.512 14.056   B0Iaep 96 0
73 XTE J1858+034 HXB 18 58 35.6252850353 +03 26 10.535956648           B?e 83 0
74 4U 1907+09 HXB 19 09 38.0514267264 +09 49 47.270139132   19.41 16.35 15.570 12.53 O9.5Iab 345 0
75 BD+53 2262 Em* 19 32 52.3078475760 +53 52 45.470183808   10.38 10.39     ~ 7 0
76 XTE J1946+274 HXB 19 45 39.3568693200 +27 21 55.501637040   18.76 16.92 15.62 14.38 B0-1IV-Ve 126 0
77 KS 1947+300 HXB 19 49 35.4841147968 +30 12 31.775979852   15.16 14.22 13.53 12.88 B0Ve 174 0
78 4U 1954+31 HXB 19 55 42.3383143920 +32 05 49.046285472   12.02 9.97     M4/5III 126 0
79 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4349 0
80 BD+47 3129 HXB 20 30 30.8452150680 +47 51 50.717123784 8.95 9.594 9.273 9.273   B0.5III/IVe 43 0
81 V* V2246 Cyg HXB 20 32 15.2749858128 +37 38 14.843024844   22.16 19.41 17.32 15.18 B0Ve 440 0
82 GRO J2058+42 HXB 20 58 47.5371521256 +41 46 37.180486128   15.97 14.74 14.74 13.35 O9.5-B0IV-Ve 87 0
83 V* V490 Cep HXB 21 39 30.6903047304 +56 59 10.421969280   15.2       B1.5Ve 169 1
84 BD+49 3718 HXB 22 01 38.2021351296 +50 10 04.633278528 8.95 9.47 9.31     Be 48 0
85 BD+53 2790 HXB 22 07 56.2366802328 +54 31 06.408879888 9.4 10.11 9.84 9.64 9.43 O9.5Vep 210 0
86 4U 2238+60 HXB 22 39 20.8443538152 +61 16 26.607472284   16.26 14.80 13.89 12.92 Be 53 0
87 NAME Local Group GrG ~ ~           ~ 8415 0

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