2003A&A...400..521G

Query : 2003A&A...400..521G

2003A&A...400..521G - Astronomy and Astrophysics, volume 400521-531 (2003/3-3)

An XMM-Newton observation of the globular cluster Omega Centauri.

GENDRE B., BARRET D. and WEBB N.A.

Abstract (from CDS):

We report on a deep XMM-Newton EPIC observation of the globular cluster Omega Cen performed on August 13th, 2001. We have detected 11 and 27 faint X-ray sources in the core and half mass radii, searching down to a luminosity of 1.3x1031ergs/s in the 0.5-5keV range. Most sources have bolometric X-ray luminosities between ∼1031-1032ergs/s. We present the color-color and hardness-intensity diagrams of the source sample, as well as high-quality EPIC spectra of the brightest objects of the field, including the two candidate Cataclysmic Variables (CVs) in the core and the quiescent neutron star low-mass X-ray binary candidate. The spectra of the latter objects fully support their previous classification. We show that the bulk of sources are hard and spectrally similar to CVs. The lack of soft faint sources might be related to the absence of millisecond pulsars in the cluster. The XMM-Newton observations reveal the presence of an excess of sources well outside the core of the cluster where several RS CVn binaries have already been found. We have also analyzed a publicly available Chandra ACIS-I observation performed on January 24-25th, 2000, to improve the XMM-Newton source positions and to search for source intensity variations between the two data sets. 63 XMM-Newton sources have a Chandra counterpart, and 15 sources within the half-mass radius have shown time variability. Overall, the general properties of the faint X-ray sources in ω Cen suggest that they are predominantly CVs and active binaries (RS CVn or BY Dra).

Abstract Copyright: ∼

Journal keyword(s): Galaxy: globular clusters: individual: Omega Centauri - X-ray: binaries - stars: neutron - stars: novae, cataclysmi variables - stars: binaries: general

VizieR on-line data: <Available at CDS (J/A+A/400/521): table1.dat table2.dat table3.dat table5.dat>

Nomenclature: Tables 1, 2, 3: [GBW2003] NNN (Nos 1-146).

Simbad objects: 153

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Number of rows : 153
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 [GBW2003] 135 X 13 25 32.6 -47 27 38           ~ 1 0
2 [GBW2003] 48 X 13 25 34.5 -47 25 59           ~ 1 0
3 [GBW2003] 75 X 13 25 39.7 -47 25 23           ~ 1 0
4 [GBW2003] 63 X 13 25 40.6 -47 22 08           ~ 1 0
5 [GBW2003] 90 X 13 25 41.3 -47 33 58           ~ 1 0
6 [GBW2003] 131 X 13 25 42.3 -47 26 36           ~ 1 0
7 [GBW2003] 106 X 13 25 44.8 -47 25 55           ~ 1 0
8 [GBW2003] 27 X 13 25 44.8369656511 -47 29 57.904317244           ~ 1 0
9 [GBW2003] 121 X 13 25 50.9 -47 31 39           ~ 1 0
10 [GBW2003] 99 X 13 25 51.0 -47 23 41           ~ 1 0
11 [GBW2003] 105 X 13 25 51.3 -47 26 45           ~ 1 0
12 2MASS J13255214-4719085 Y*? 13 25 52.1440450344 -47 19 08.487218676 16.877 16.295 14.764   12.296 ~ 12 0
13 [GBW2003] 143 X 13 25 52.5 -47 36 12           ~ 1 0
14 [GBW2003] 33 V* 13 25 52.7 -47 28 55           ~ 3 0
15 [GBW2003] 37 X 13 25 53.5 -47 33 49           ~ 1 0
16 [GBW2003] 123 X 13 25 54.7 -47 29 33           ~ 1 0
17 [GBW2003] 26 X 13 25 55.9 -47 26 20           ~ 1 0
18 [GBW2003] 98 X 13 25 57.3 -47 28 59           ~ 1 0
19 [GBW2003] 21 X 13 25 57.393 -47 32 51.72           ~ 3 0
20 [GBW2003] 138 X 13 25 58.0 -47 27 32           ~ 1 0
21 [GBW2003] 130 X 13 25 58.9 -47 33 48           ~ 1 0
22 [GBW2003] 62 X 13 26 00.78 -47 29 12.3           ~ 2 0
23 [GBW2003] 136 X 13 26 00.8 -47 28 22           ~ 1 0
24 SOPS IV e-94 C* 13 26 01.5892714032 -47 33 05.967491724   13.184 11.444 11.072 9.966 C1,3p 58 0
25 [GBW2003] 43 X 13 26 03.8 -47 20 43           ~ 1 0
26 [GBW2003] 76 X 13 26 04.60 -47 27 41.3           ~ 2 0
27 [GBW2003] 51 X 13 26 06.00 -47 29 19.6           ~ 2 0
28 [GBW2003] 19 X 13 26 07.4 -47 38 01           ~ 1 0
29 [GBW2003] 87 X 13 26 07.4 -47 30 27           ~ 1 0
30 [GBW2003] 78 X 13 26 07.9 -47 29 55           ~ 1 0
31 Cl* NGC 5139 SAW V216 RR* 13 26 08.2237354488 -47 30 32.677450560 15.932 15.951 15.112 14.540 14.023 ~ 11 0
32 [GBW2003] 124 X 13 26 10.2 -47 31 14           ~ 1 0
33 [GBW2003] 55 X 13 26 10.4 -47 39 11           ~ 1 0
34 [GBW2003] 71 X 13 26 10.6 -47 40 29           ~ 1 0
35 [GBW2003] 93 X 13 26 10.8 -47 35 07           ~ 1 0
36 [GBW2003] 10 X 13 26 11.4 -47 37 11           ~ 3 0
37 Cl* NGC 5139 BPB 87332 V* 13 26 11.5335573672 -47 34 03.100594584 15.582 14.614 13.385 12.635 12.004 ~ 9 0
38 [GBW2003] 79 X 13 26 12.686 -47 24 13.71           ~ 3 0
39 [GBW2003] 120 X 13 26 13.0 -47 35 56           ~ 1 0
40 [GBW2003] 104 X 13 26 13.3 -47 30 20           ~ 1 0
41 [GBW2003] 91 X 13 26 13.5 -47 29 14           ~ 1 0
42 [GBW2003] 22 X 13 26 13.561 -47 34 40.63           ~ 3 0
43 [GBW2003] 137 X 13 26 15.5 -47 30 15           ~ 1 0
44 [GBW2003] 65 X 13 26 18.3 -47 17 29           ~ 1 0
45 [GBW2003] 139 X 13 26 18.9 -47 32 07           ~ 1 0
46 2E 3049 X 13 26 19.796 -47 29 10.51   26.8   25.3   ~ 22 0
47 [GBW2003] 13 X 13 26 20.366 -47 30 02.94   20.9   20.7   ~ 5 0
48 [GBW2003] 115 X 13 26 21.3 -47 27 08           ~ 1 0
49 [GBW2003] 39 X 13 26 23.13 -47 22 51.1           ~ 2 0
50 [GBW2003] 17 X 13 26 23.500 -47 19 22.09           ~ 3 0
51 [GBW2003] 117 X 13 26 23.64 -47 30 44.1           ~ 4 0
52 [GBW2003] 46 X 13 26 23.8 -47 36 14           ~ 1 0
53 [GBW2003] 128 X 13 26 24.1 -47 37 46           ~ 1 0
54 2XMM J132625.1-473227 AG? 13 26 25.14 -47 32 27.4           ~ 7 0
55 [GBW2003] 89 X 13 26 25.7 -47 39 04           ~ 1 0
56 [GBW2003] 142 X 13 26 26.6 -47 37 13           ~ 1 0
57 [GBW2003] 40 X 13 26 26.964 -47 34 10.57           ~ 3 0
58 [GBW2003] 118 X 13 26 27.3 -47 24 00           ~ 1 0
59 [GBW2003] 30 X 13 26 27.510 -47 34 57.66           ~ 3 0
60 [GBW2003] 49 X 13 26 28.651 -47 26 27.29   23.5   22.2   ~ 4 0
61 [GBW2003] 50 X 13 26 29.356 -47 28 13.21   25   24.6   ~ 4 0
62 [GBW2003] 80 X 13 26 30.55 -47 26 02.3           ~ 2 0
63 [GBW2003] 132 X 13 26 31.0 -47 18 49           ~ 1 0
64 [GBW2003] 59 X 13 26 31.315 -47 24 39.27   21.6   21.0   ~ 3 0
65 [GBW2003] 58 X 13 26 32.4 -47 38 51           ~ 1 0
66 [GBW2003] 125 X 13 26 33.1 -47 41 29           ~ 1 0
67 [GBW2003] 60 X 13 26 34.310 -47 30 34.50           ~ 3 0
68 [GBW2003] 72 X 13 26 34.387 -47 29 55.71   22.8   22.2   ~ 3 0
69 [GBW2003] 73 X 13 26 34.96 -47 20 52.2           ~ 2 0
70 2MASS J13263654-4737296 X 13 26 36.55 -47 37 29.7           ~ 1 0
71 [GBW2003] 20 X 13 26 37.440 -47 30 53.34   18.8   17.5   ~ 4 0
72 [GBW2003] 126 X 13 26 37.460 -47 24 29.93   27   25.8   ~ 3 0
73 [GBW2003] 101 X 13 26 37.78 -47 29 10.6           ~ 2 0
74 [GBW2003] 119 X 13 26 37.8 -47 16 01           ~ 1 0
75 NGC 5139 6168 CV* 13 26 38.4422672760 -47 19 59.697845760 15.436 15.390 14.737 14.311 13.920 ~ 10 0
76 [GBW2003] 45 X 13 26 39.240 -47 36 30.25           ~ 3 0
77 Cl* NGC 5139 WFI 236164 X 13 26 40.98 -47 27 41.3   14.319     12.167 ~ 3 0
78 [GBW2003] 67 X 13 26 40.994 -47 24 02.22   25.2   22.9   ~ 4 0
79 [GBW2003] 15 X 13 26 41.448 -47 22 16.79           ~ 3 0
80 [GBW2003] 92 X 13 26 44.09 -47 28 56.9           ~ 2 0
81 [GBW2003] 16 X 13 26 44.102 -47 32 31.46   21.4   20.7   ~ 4 0
82 [GBW2003] 103 X 13 26 45.20 -47 26 52.7           ~ 2 0
83 HD 116789 * 13 26 46.3304474544 -47 19 46.052982804   8.52 8.43     A0V 19 0
84 [GBW2003] 108 X 13 26 46.491 -47 31 40.75   24.4   22.7   ~ 4 0
85 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
86 Cl* NGC 5139 SAW V210 RR* 13 26 47.31 -47 36 00.0 17.932 17.810 16.927 16.461 15.897 ~ 7 0
87 2MASS J13264778-4725513 * 13 26 47.7959421960 -47 25 51.329962128           ~ 1 0
88 [GBW2003] 77 X 13 26 48.50 -47 22 18.9           ~ 2 0
89 [RBB2002b] 18 X 13 26 48.651 -47 27 44.82   22.3   21.3   ~ 6 0
90 2E 1323.8-4713 X 13 26 48.656 -47 27 44.88           ~ 8 0
91 [GBW2003] 9 X 13 26 48.731 -47 31 25.28   22.2   21.7   ~ 6 0
92 [GBW2003] 122 X 13 26 48.9 -47 24 52           ~ 1 0
93 [GBW2003] 57 X 13 26 49.584 -47 32 12.83   23.1   22.6   ~ 5 0
94 [GBW2003] 35 X 13 26 49.80 -47 31 47.9           ~ 2 0
95 [GBW2003] 111 X 13 26 50.2 -47 28 40           ~ 1 0
96 [GBW2003] 36 X 13 26 51.057 -47 31 45.64           ~ 3 0
97 [CCG2000] Star A CV* 13 26 52.135 -47 29 35.63   21.6   20.9   ~ 12 0
98 [GBW2003] 61 X 13 26 52.54 -47 27 38.0           ~ 2 0
99 CXOHCD J132652.67-472713.5 * 13 26 52.6437879264 -47 27 14.286607920   25.5   24.5   ~ 4 0
100 Cl* NGC 5139 SAW V223 RR* 13 26 53.2386691224 -47 18 22.781613420 16.575 16.127 14.795   13.526 ~ 4 0
101 [GBW2003] 29 V* 13 26 53.3 -47 18 24           ~ 2 0
102 [CCG2000] Star B CV* 13 26 53.513 -47 29 00.38   21.1   20.0   ~ 12 0
103 [GBW2003] 32 X 13 26 54.496 -47 22 05.34           ~ 3 0
104 [GBW2003] 38 X 13 26 55.066 -47 31 13.69   20.2   19.3   ~ 4 0
105 [GBW2003] 54 X 13 26 56.4 -47 17 15           ~ 1 0
106 2MASS J13265798-4741214 * 13 26 57.9782807928 -47 41 21.511996728           ~ 1 0
107 [GBW2003] 52 X 13 26 59.191 -47 34 59.26           ~ 3 0
108 [GBW2003] 42 X 13 26 59.2 -47 28 17           ~ 1 0
109 [GBW2003] 113 X 13 27 00.29 -47 37 15.3           ~ 2 0
110 [GBW2003] 53 X 13 27 01.2 -47 40 56           ~ 1 0
111 [GBW2003] 56 X 13 27 02.8 -47 19 30           ~ 1 0
112 [GBW2003] 112 X 13 27 03.3 -47 42 42           ~ 1 0
113 [GBW2003] 127 X 13 27 04.52 -47 30 38.0           ~ 2 0
114 [GBW2003] 88 X 13 27 04.9 -47 31 10           ~ 1 0
115 [GBW2003] 97 X 13 27 05.8 -47 18 35           ~ 1 0
116 [GBW2003] 82 X 13 27 06.396 -47 25 38.20   21.8   20.7   ~ 4 0
117 [GBW2003] 41 X 13 27 08.011 -47 23 33.86   25.7   24.2   ~ 4 0
118 Cl* NGC 5139 SAW V383 V* 13 27 08.42 -47 20 28.6 18.649 18.439 17.276 16.736 16.148 ~ 3 0
119 [GBW2003] 34 X 13 27 10.001 -47 33 21.99           ~ 3 0
120 Cl* NGC 5139 SAW V377 V* 13 27 10.1094559440 -47 21 27.807596388 17.179 16.697 15.812 15.226 14.652 ~ 5 0
121 [GBW2003] 11 X 13 27 11.785 -47 32 41.43           ~ 3 0
122 [GBW2003] 110 X 13 27 12.32 -47 24 24.5           ~ 2 0
123 [GBW2003] 23 X 13 27 12.887 -47 34 57.79           ~ 3 0
124 [GBW2003] 47 X 13 27 14.57 -47 28 30.8           ~ 2 0
125 [GBW2003] 114 X 13 27 14.65 -47 31 50.6           ~ 2 0
126 [GBW2003] 107 X 13 27 16.1 -47 30 00           ~ 1 0
127 [GBW2003] 102 X 13 27 17.01 -47 28 19.6           ~ 2 0
128 [GBW2003] 18 X 13 27 21.200 -47 23 23.73           ~ 4 0
129 Cl* NGC 5139 SAW V369 V* 13 27 21.572 -47 32 06.53 16.819 16.864 16.146 15.535 15.114 ~ 6 0
130 [GBW2003] 83 X 13 27 22.5 -47 39 46           ~ 1 0
131 [GBW2003] 116 X 13 27 23.0 -47 33 05           ~ 1 0
132 [GBW2003] 141 X 13 27 23.4 -47 35 22           ~ 1 0
133 [GBW2003] 134 X 13 27 25.0 -47 37 15           ~ 1 0
134 [GBW2003] 12 X 13 27 27.61 -47 31 33.2           ~ 3 0
135 NGC 5139 6221 Y*? 13 27 27.6571684512 -47 19 07.636014300 17.018 16.220 14.654 14.46 11.968 ~ 13 0
136 [GBW2003] 94 X 13 27 28.290 -47 24 24.86           ~ 3 0
137 2XMM J132729.2-472554 AG? 13 27 29.30 -47 25 54.1           ~ 6 0
138 [GBW2003] 129 X 13 27 33.3 -47 22 48           ~ 1 0
139 [GBW2003] 69 X 13 27 33.4 -47 38 35           ~ 1 0
140 [GBW2003] 146 X 13 27 39.3 -47 25 57           ~ 1 0
141 [GBW2003] 84 X 13 27 39.62 -47 30 24.3           ~ 2 0
142 [GBW2003] 100 X 13 27 45.8 -47 30 01           ~ 1 0
143 [GBW2003] 109 X 13 27 48.5 -47 30 26           ~ 1 0
144 [GBW2003] 140 X 13 27 48.5 -47 28 01           ~ 1 0
145 [GBW2003] 85 X 13 27 53.7 -47 35 08           ~ 1 0
146 [GBW2003] 86 X 13 27 57.9 -47 25 12           ~ 1 0
147 [GBW2003] 133 X 13 27 58.4 -47 22 04           ~ 1 0
148 [GBW2003] 144 X 13 27 59.4 -47 26 10           ~ 1 0
149 [GBW2003] 70 X 13 28 01.9 -47 23 17           ~ 1 0
150 [GBW2003] 145 X 13 28 08.7 -47 21 37           ~ 1 0
151 HD 116993 * 13 28 09.0491488296 -47 33 27.020342268   10.59 9.51     K1(III) 11 0
152 [GBW2003] 64 X 13 28 14.1 -47 29 24           ~ 1 0
153 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0

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