2001A&A...371..816K

Query : 2001A&A...371..816K

2001A&A...371..816K - Astronomy and Astrophysics, volume 371, 816-832 (2001/6-1)

ROSAT X-ray sources in the field of the LMC. I. Total LMC gas from the background AGN spectral fits.

KAHABKA P., DE BOER K.S. and BRUENS C.

Abstract (from CDS):

We analyzed a sample of 26 background X-ray sources in a ∼60 square degree field of the Large Magellanic Cloud observed with the ROSAT PSPC. The sample has been selected from previously classified and optically identified X-ray sources. In addition, pointlike and spectrally hard sources with at least 100 to 200 observed counts have been used for the analysis. We performed X-ray spectral fitting and derived total hydrogen absorbing column densities due to LMC gas in the range (1020-2x1021)cm–2. We compared these columns with the HI columns derived from a 21-cm Parkes survey of the LMC. For 7 optically identified sources we find, within the uncertainties derived from the X-ray spectral fit, agreement for both columns. For a further 19 sources, we constrain the LMC columns from the X-ray spectral fit assuming that the power law photon index is that of AGN type spectra. We derive for 20 sources gas columns which are within the uncertainties, in agreement with the HI columns. We derive for two background sources (RX J0536.9-6913 and RX J0547.0-7040) hydrogen absorbing column densities due to LMC gas, which are in excess compared to the HI columns. These sources - located in regions of large (∼3x1021cm–2) LMC HI column densities - could be seen through additional gas which may be warm and diffuse, cold or molecular. For 10 sources we derive upper limits for the gas columns additional to HI and constrain the molecular mass fraction to <(30-140)%.

Abstract Copyright: ∼

Journal keyword(s): galaxies: individual: LMC - galaxies: active - galaxies: ISM - radio continuum: galaxies - X-rays: galaxies

Simbad objects: 51

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Number of rows : 51
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11149 1
2 RX J0436.2-6822 X 04 36 12.5 -68 22 36           ~ 5 0
3 2MASS J04541083-6643167 Sy1 04 54 10.8388531728 -66 43 16.500438192 17.262 18.080 17.88 17.250 16.97 ~ 11 0
4 6dFGS gJ050304.0-663346 Sy1 05 03 03.968 -66 33 45.60   13.9   14.5   ~ 38 0
5 LEDA 3095714 Sy1 05 09 15.3760431624 -69 54 17.308029168 16.723 18.454 17.345 16.920 16.505 ~ 16 0
6 RX J0510.4-6737 X 05 10 29.1 -67 37 40           ~ 5 0
7 GH 7-19 G 05 15 05 -65 11.4     12.8     ~ 2 0
8 RX J0515.1-6511 X 05 15 10.9 -65 11 31           ~ 2 0
9 GH 7-20 G 05 15.2 -65 12     16.3     ~ 2 0
10 ICRF J051637.7-723707 QSO 05 16 37.71905215 -72 37 07.4656674       18.907   ~ 35 1
11 RX J0516.6-7237 X 05 16 37.9 -72 37 01           ~ 3 0
12 2E 1250 Sy1 05 17 16.950 -70 44 02.00 19.033 19.631 18.96 17.772 18.25 ~ 22 0
13 HD 35324 PM* 05 17 25.8446392416 -71 31 59.284587108   9.06 7.72     K2IIICNII 21 0
14 RX J0522.7-6928 X 05 22 46.9 -69 28 34           ~ 4 0
15 RX J0523.2-7015 X 05 23 12.8 -70 15 21           ~ 4 0
16 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17434 0
17 LEDA 88408 Sy1 05 24 02.262 -70 11 08.63 17.553 18.316 18.27 17.550 17.23 ~ 29 0
18 RX J0528.8-6539 X 05 28 50.2 -65 39 38           ~ 7 0
19 RX J0529.0-6603 X 05 29 00.6 -66 03 04           ~ 3 0
20 RX J0530.1-6551 X 05 30 10.6000 -65 51 26.994           ~ 11 1
21 2E 1337 Q? 05 31 31.610 -71 29 47.00 19.055 19.912 19.571 18.345 18.122 ~ 20 0
22 NAME LMC 4 Supergiant Shell sh 05 31 33 -66 40.5           ~ 176 0
23 LEDA 3095722 Sy1 05 31 59.6922545184 -69 19 51.461379588   18.9 18.96   18.18 ~ 18 0
24 2MASX J05322273-6406560 G 05 32 22.73 -64 06 56.0           ~ 5 0
25 IRAS F05322-6409 IR 05 32 31.9 -64 07 12           ~ 2 0
26 ESO 56-154 G 05 33 59.2832742768 -71 45 24.786193212 17.317 14.01 15.201 13.08 12.939 ~ 15 0
27 RX J0534.1-7018 X 05 34 08.2 -70 18 58           ~ 4 0
28 RX J0534.1-7037 X 05 34 08.25 -70 37 17.3           ~ 4 0
29 2E 1445 Sy1 05 34 45.7 -67 38 57   17.8 17.8     ~ 13 0
30 2XMM J053600.4-704127 Sy1 05 36 00.480 -70 41 27.70     19.41   18.43 ~ 17 0
31 RX J0536.9-6913 X 05 36 57.8 -69 13 26           ~ 6 1
32 NGC 2060 SNR 05 37 51.4466169456 -69 10 23.947092084   9.69 9.59     ~ 360 2
33 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2019 2
34 2MASS J05402713-6241039 AG? 05 40 27.1346191944 -62 41 04.059933720           ~ 5 0
35 RX J0541.6-6511 X 05 41 39.1 -65 11 16           ~ 4 0
36 [OKM2018] SWIFT J0547.1-6427 Sy1 05 46 41.8381012440 -64 15 21.934341504     18.00 15.33   ~ 50 1
37 2E 1568 HXB 05 47 02.12 -68 51 57.6           ~ 11 1
38 RX J0547.0-7040 X 05 47 05.57 -70 40 38.6           ~ 3 0
39 LMC-BM 42-26 C* 05 47 07.1312944416 -70 40 26.829424848     16.47 14.168 14.032 C 9 0
40 2E 1571 BLL 05 47 45.2 -67 45 06   20.2 20.2     ~ 25 1
41 RX J0548.4-7112 X 05 48 28.7 -71 12 41           ~ 4 0
42 [VV2010c] J055031.2-710958 SyG 05 50 31.030 -71 09 57.10   19.9 19.65   19.24 ~ 15 0
43 2MASS J05503351-6636524 Sy1 05 50 33.5027826816 -66 36 52.665001344   17.0 17.0   19.229 ~ 20 0
44 2MASS J05522451-6402108 Sy1 05 52 24.5023213488 -64 02 10.757771160     15.04     ~ 47 1
45 RX J0601.1-7036 X 06 01 10.9 -70 36 14           ~ 3 0
46 ICRF J060111.2-703608 QSO 06 01 11.2488493488 -70 36 08.802829692       18.244   ~ 103 1
47 LEDA 89499 Sy2 06 02 54.066 -71 03 10.48   15.6       ~ 94 1
48 RX J0603.3-7043 X 06 03 22.2 -70 43 58           ~ 3 0
49 PMN J0606-7041 Rad 06 06 05 -70 41.8           ~ 4 0
50 RX J060740-66516 X 06 07 40 -66 51.6           ~ 3 0
51 RX J0607.6-6651 X 06 07 41.0 -66 51 37           ~ 3 0

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