2003ApJ...586..983N

Query : 2003ApJ...586..983N

2003ApJ...586..983N - Astrophys. J., 586, 983-995 (2003/April-1)

An X-ray investigation of the NGC 346 field in the Small Magellanic Cloud. II. The field population.

NAZE Y., HARTWELL J.M., STEVENS I.R., MANFROID J., MARCHENKO S., CORCORAN M.F., MOFFAT A.F.J. and SKALKOWSKI G.

Abstract (from CDS):

We present results from a Chandra observation of the NGC 346 cluster, which is the ionizing source of N66, the most luminous H II region and the largest star formation region in the SMC. In the first part of this investigation, we have analyzed the X-ray properties of the cluster itself and the remarkable star HD 5980, but the field contains additional objects of interest. In total, 75 X-ray point sources were detected in the Chandra observation: this is 5 times the number of sources detected by previous X-ray surveys. We investigate here their characteristics in detail. Because of high foreground absorption, the sources possess rather high hardness ratios. Their cumulative luminosity function appears generally steeper than that for the rest of the SMC at higher luminosities. Their absorption columns suggest that most of the sources belong to NGC 346. Using Digitized Sky Survey data and new UBVRI imaging with the ESO 2.2 m telescope, we also discovered possible counterparts for 32 of these X-ray sources and estimated a B spectral type for a large number of these counterparts. This tends to suggest that most of the X-ray sources in the field are in fact X-ray binaries. Finally, some objects show X-ray and/or optical variability, with a need for further monitoring.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Star Clusters - ISM: H II Regions - Galaxies: Magellanic Clouds - X-Rays: Individual: NGC Number: NGC 346

Nomenclature: Table 1, Fig.1: [NHS2003] NN (Nos 1-75).

Simbad objects: 85

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Number of rows : 85
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 LHA 115-N 58 Rad 00 56 27.2 -72 19 03           ~ 22 1
3 RX J0056.9-7211 * 00 56 54.1 -72 11 57   21.87 21.32     F5III 4 0
4 2MASS J00571280-7210421 AG? 00 57 12.80 -72 10 42.2   17.68 17.14     ~ 3 0
5 [HFP2000] 223 X 00 57 21.9 -72 23 57           ~ 2 0
6 2E 0055.6-7241 EmG 00 57 27.2 -72 25 01           ~ 12 0
7 GSC2 S01020209846 * 00 57 30.060 -72 10 09.20   19.66 19.67     B9V 1 0
8 2MASS J00573272-7213022 AGN 00 57 32.7654620568 -72 13 02.183006892   15.4     17.706 ~ 17 0
9 [MA93] 1016 Em* 00 57 34.2203046072 -72 12 40.904453880 15.20 16.10 16.20   16.14 B1-3e 4 0
10 [MA93] 1020 HXB 00 57 36.0162576624 -72 19 34.056483744 14.89 15.95 16.008 15.79 15.806 B0/4e 49 0
11 AzV 191 s*b 00 57 37.2220707000 -72 13 09.258396096 12.36 13.41 13.52   13.68 B1.5:Iae 21 0
12 XMMU J005741.8-720902 AG? 00 57 41.836 -72 09 02.94           ~ 3 0
13 [MA93] 1038 HXB 00 57 50.3868809664 -72 07 56.130650112 14.63 15.64 15.69   15.420 B1-2(Be-Fe) 46 0
14 [NHS2003] 7 X 00 57 51.162 -72 08 27.75           ~ 1 0
15 [NHS2003] 8 X 00 57 59.561 -72 16 19.18           ~ 1 0
16 GSC2 S010202012821 * 00 58 00.323 -72 08 22.01   18.74 18.86     B6V 1 0
17 GSC2 S01020205791 X 00 58 01.7 -72 13 51   19.36 19.11     ~ 3 0
18 XMMU J005802.4-721205 AG? 00 58 02.5439729328 -72 12 06.613706844           ~ 5 0
19 [NHS2003] 12 X 00 58 08.409 -72 03 36.98           ~ 1 0
20 XMMU J005809.2-720827 AG? 00 58 09.211 -72 08 27.05           ~ 3 0
21 [NHS2003] 14 X 00 58 09.370 -72 16 12.20           ~ 1 0
22 [NHS2003] 15 X 00 58 11.883 -72 07 18.94           ~ 1 0
23 SNR B0056-72.5 SNR 00 58 18.40 -72 17 22.7   20.58 20.70     ~ 59 1
24 [NHS2003] 17 X 00 58 22.688 -72 14 48.48           ~ 1 0
25 [NHS2003] 18 X 00 58 27.126 -72 10 24.68           ~ 1 0
26 XMMU J005827.7-720458 AG? 00 58 27.718 -72 04 58.04           ~ 3 0
27 RX J0058.5-7208 AG? 00 58 30.101 -72 08 41.56   22.16 20.88     ~ 5 0
28 [NHS2003] 21 X 00 58 30.370 -72 00 44.60           ~ 1 0
29 [NHS2003] 22 X 00 58 30.687 -72 15 28.36   19.41 19.25     ~ 1 0
30 [NHS2003] 23 X 00 58 31.630 -72 09 51.48           ~ 3 0
31 RX J0058.6-7203 X 00 58 37.0 -72 03 11           ~ 4 0
32 [NHS2003] 25 X 00 58 37.753 -72 14 35.71           ~ 1 0
33 XMMU J005839.5-720227 AG? 00 58 39.564 -72 02 27.46   19.97 20.05     ~ 3 0
34 [NHS2003] 27 X 00 58 49.750 -72 17 14.90           ~ 1 0
35 GSC2 S010202028457 * 00 58 58.200 -72 01 07.40   20.20 18.71     K4III 1 0
36 XMMU J005900.8-721329 * 00 59 00.744 -72 13 28.75           A1III 2 0
37 [SBW2007b] 18 Y*O 00 59 03.34 -72 12 24.3           ~ 3 0
38 NGC 346 Cl* 00 59 04.4000 -72 10 39.000           ~ 547 0
39 Cl* NGC 346 SSN 7 s*b 00 59 04.4955841440 -72 10 24.744449712   12.37 12.57     O4If+O5-6 46 0
40 [NHS2003] 32 X 00 59 08.135 -72 12 45.85           ~ 1 0
41 2MASS J00590879-7215292 RB? 00 59 08.80 -72 15 29.3   19.94 18.75   17.21 ~ 2 0
42 [NHS2003] 34 * 00 59 11.273 -72 12 23.61   19.51 19.55     B9V 1 0
43 [NHS2003] 35 X 00 59 12.490 -72 20 11.70           ~ 1 0
44 [SBW2007b] 30 Y*O 00 59 13.33 -72 16 19.1   19.39 19.29     ~ 3 0
45 XMMU J005918.0-721112 X 00 59 18.146 -72 11 14.90   19.53 18.73     ~ 2 0
46 XMMU J005918.8-720425 AG? 00 59 18.824 -72 04 25.76           ~ 2 0
47 [NHS2003] 39 X 00 59 21.780 -72 15 40.12   21.30 20.57     ~ 1 0
48 [NHS2003] 40 RB? 00 59 25.0382315472 -72 14 32.189875548 19.56 18.77 17.68   16.45 ~ 3 0
49 HD 5980 WR* 00 59 26.5838833944 -72 09 53.927337312   11.13 11.31   11.029 WN4+O7I: 419 1
50 SNR B0057-72.2 SNR 00 59 27.40 -72 10 10.7   12.37 12.57     ~ 251 0
51 [NHS2003] 42 X 00 59 29.589 -72 12 34.65           ~ 1 0
52 [SBW2007b] 107 Y*? 00 59 31.60 -72 14 18.6           ~ 3 0
53 [NHS2003] 44 X 00 59 33.762 -72 10 39.72           ~ 1 0
54 [NHS2003] 45 X 00 59 33.926 -72 07 49.71   21.69 21.24     ~ 2 0
55 XMMU J005935.0-720210 AG? 00 59 35.100 -72 02 10.57   19.97 19.42     ~ 3 0
56 [NHS2003] 47 X 00 59 35.530 -72 08 34.73           ~ 3 0
57 XMMU J005937.2-721651 AG? 00 59 37.300 -72 16 51.07   20.41 19.54     ~ 2 0
58 [NHS2003] 49 X 00 59 40.232 -72 19 03.24           ~ 1 0
59 [NHS2003] 50 RB? 00 59 43.1929152576 -72 13 07.712378616   21.31 19.54   16.57 ~ 2 0
60 XMMU J005945.9-720252 AG? 00 59 45.944 -72 02 52.00           ~ 2 0
61 [NHS2003] 52 X 00 59 47.340 -72 09 29.51           ~ 1 0
62 [NHS2003] 53 X 00 59 49.632 -72 10 20.14   20.30 20.41     ~ 1 0
63 [NHS2003] 54 X 00 59 52.006 -72 16 40.39           ~ 1 0
64 XMMU J005952.8-721531 AG? 00 59 52.865 -72 15 31.69           ~ 3 0
65 [NHS2003] 56 * 00 59 53.254 -72 06 34.00   21.11 20.86     A3V 1 0
66 [NHS2003] 57 X 00 59 54.300 -72 10 31.79   18.13 18.08     ~ 1 0
67 [NHS2003] 58 X 01 00 06.170 -72 13 44.00           ~ 1 0
68 [NHS2003] 59 X 01 00 11.742 -72 16 29.06   19.86 19.26     ~ 1 0
69 RX J0100.2-7204 HXB 01 00 15.752 -72 04 43.40   22.39 21.32     ~ 10 0
70 [NHS2003] 61 AG? 01 00 17.681 -72 10 51.52   18.80 18.87     ~ 3 0
71 [SG2005] SMC 45 HXB 01 00 22.9 -72 11 27     17.0     ~ 3 0
72 XMMU J010027.6-720534 AG? 01 00 27.604 -72 05 34.01   21.14 20.82     ~ 2 0
73 [NHS2003] 64 X 01 00 28.460 -72 04 51.50     21.03     ~ 1 0
74 [NHS2003] 65 X 01 00 29.039 -72 05 12.33   20.43 19.55     ~ 1 0
75 [NHS2003] 66 X 01 00 30.330 -72 11 29.19           ~ 2 0
76 [NHS2003] 67 X 01 00 36.740 -72 09 13.60           ~ 1 0
77 [SG2005] SMC 39 HX? 01 00 37.3 -72 13 17   16.62 16.7     B2V 6 0
78 PSR J0100-7211 Psr 01 00 42.86 -72 11 33.3   17.69 17.82     B3V 101 0
79 GSC2 S01020208968 * 01 00 43.014 -72 11 32.72           ~ 2 0
80 [MA93] 1240 HXB 01 01 02.8880678424 -72 06 58.964665824   15.68 15.757 15.52 15.576 B0-B2III-V 50 0
81 XMMU J010103.8-721007 * 01 01 07.9 -72 10 26   18.47 18.42     B6V 3 0
82 NGC 1553 GiP 04 16 10.4697802536 -55 46 48.072797400 10.76 10.10 9.40 8.74   ~ 395 2
83 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
84 NGC 3256 Sy2 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 920 2
85 NGC 4697 GiG 12 48 35.8981498824 -05 48 02.482374564   10.97   9.83   ~ 895 0

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