2003ApJ...592..884D

Query : 2003ApJ...592..884D

2003ApJ...592..884D - Astrophys. J., 592, 884-899 (2003/August-1)

Luminous supersoft X-ray sources in external galaxies.

DI STEFANO R. and KONG A.K.H.

Abstract (from CDS):

We use a set of conservative criteria to identify luminous supersoft X-ray sources (SSSs) in external galaxies. We test this approach on blackbody models and then apply it to Chandra data from four galaxies: an elliptical galaxy (NGC 4967), two face-on spiral galaxies (M101 and M83), and an interacting galaxy (M51). We find SSSs in every galaxy and estimate that the total SSS population of sources with L>1037 ergs/s in each galaxy is at least several hundred and could be significantly larger. In addition, we discover two intriguing features of galactic populations of SSSs. First, there are significant subpopulations of high-luminosity sources; the bolometric luminosities can exceed 1039 ergs/s. Second, in the spiral galaxies M101, M83, and M51, SSSs appear to be associated with the spiral arms. This may indicate that some SSSs are young systems, possibly younger than 108 yr.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Individual: Messier Number: M51 - Galaxies: Individual: Messier Number: M83 - Galaxies: Individual: Messier Number: M101 - Galaxies: Individual: NGC Number: NGC 4697 - Methods: Data Analysis - ISM: Supernova Remnants - Stars: White Dwarfs - X-Rays: Binaries - X-Rays: Galaxies

Nomenclature: Table 3: [DK2003] M101-NNN N=16 among (Nos 15-104), [DK2003] M51-NN N=4 among (Nos 12-58), [DK2003] M83-NNN N=10 among (Nos 20-128).

CDS comments: In the abstract NGC 4967 is a misprint for NGC 4697. Table 3: Objects in NGC 4697 are [SIB2001] in SIMBAD.

Simbad objects: 42

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Number of rows : 42
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 RX J0059.2-7138 HXB 00 59 12.7444006824 -71 38 44.962383408   14.07 14.01 14.36   B1-B1.5II-III 90 0
3 OGLE LMC-SC20 113500 EB* 05 46 46.5466334000 -71 08 53.755688443     19.163   18.886 ~ 263 0
4 [CHP2004] J124834.5-054750 X 12 48 34.54 -05 47 49.3           ~ 4 0
5 NGC 4697 GiG 12 48 35.8981498824 -05 48 02.482374564   10.97   9.83   ~ 895 0
6 [CHP2004] J124837.2-054759 X 12 48 37.17 -05 47 58.8           ~ 4 0
7 [CHP2004] J124841.3-054820 X 12 48 41.27 -05 48 19.4           ~ 4 0
8 RX J132943+47115 UX? 13 29 43.31 +47 11 34.8   23.20 24.01   25.50 ~ 32 1
9 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
10 [DK2003] M51-51 X 13 29 55.3 +47 11 26           ~ 1 0
11 [DK2003] M51-42 HXB 13 29 55.45 +47 11 43.7           ~ 6 0
12 [CHP2004] J133002.4+471239 X 13 30 02.3 +47 12 38           ~ 3 0
13 CXOU J133653.9-294848 SNR 13 36 53.89 -29 48 48.4           ~ 12 0
14 [DK2003] M83-128 X 13 36 57.7 -29 53 53           ~ 2 0
15 CXOU J133659.1-295336 SNR 13 36 59.09 -29 53 36.2           ~ 9 0
16 CXOU J133659.5-295203 SNR 13 36 59.51 -29 52 04.0           ~ 15 0
17 CXOU J133700.4-295054 SNR 13 37 00.3954138792 -29 50 54.881842704           ~ 8 0
18 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2778 2
19 [DK2003] M83-54 X 13 37 01.17 -29 54 49.2           ~ 8 0
20 [SW2003] 96 X 13 37 06.19 -29 52 32.0           ~ 4 0
21 CXOU J133706.5-295416 X 13 37 06.54 -29 54 16.0           ~ 4 0
22 CXOU J133707.4-295133 SNR 13 37 07.48 -29 51 33.4           ~ 13 0
23 [LKB2014] X368 SNR 13 37 12.81 -29 50 12.3           ~ 11 0
24 2CXO J140259.4+542042 HXB 14 02 59.44629 +54 20 42.6690   25.76 26.39   25.35 ~ 5 0
25 2CXO J140301.1+542341 HXB 14 03 01.220 +54 23 41.41   24.04 23.90   23.63 ~ 6 0
26 [CHP2004] J140302.6+542417 X 14 03 02.5 +54 24 16           ~ 3 0
27 2CXO J140308.0+542123 HXB 14 03 08.01444 +54 21 23.1328   23.22 23.20   23.03 ~ 5 0
28 [CHP2004] J140308.5+542058 X 14 03 08.5 +54 20 57           ~ 3 0
29 2CXO J140308.6+542336 HXB 14 03 08.64307 +54 23 36.4002   23.79 23.97   24.25 ~ 5 0
30 2CXO J140310.7+542126 HXB 14 03 10.72831 +54 21 26.3033   23.65 23.79   23.97 ~ 5 0
31 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
32 [DK2003] M101-51 HII 14 03 12.9 +54 20 08           ~ 4 0
33 [DK2003] M101-50 SNR 14 03 13.290 +54 21 56.74           ~ 7 0
34 2CXO J140313.9+541810 X 14 03 13.97183 +54 18 10.1575           ~ 6 0
35 [DK2003] M101-78 HII 14 03 22.6 +54 20 38           ~ 2 0
36 [DK2003] M101-80 HII 14 03 24.0 +54 23 37           ~ 2 0
37 2CXO J140329.9+542057 HXB 14 03 29.910 +54 20 57.27   25.58 25.51   25.49 ~ 6 0
38 [DK2003] M101-101 X 14 03 31.9 +54 23 23           ~ 2 0
39 [JRW2005b] 122 UX? 14 03 32.38 +54 21 03.0   21.13       ~ 120 0
40 [DK2003] M101-104 HII 14 03 33.2 +54 17 59   20.26       ~ 4 0
41 EM* LkHA 170 Ae* 20 52 12.7783926120 +44 19 26.086865808   14.958 14.578 14.261   A0e 124 0
42 NAME Local Group GrG ~ ~           ~ 9325 0

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