2004ApJ...609..755B

Query : 2004ApJ...609..755B

2004ApJ...609..755B - Astrophys. J., 609, 755-765 (2004/July-2)

X-ray sources and their optical counterparts in the globular cluster M4.

BASSA C., POOLEY D., HOMER L., VERBUNT F., GAENSLER B.M., LEWIN W.H.G., ANDERSON S.F., MARGON B., KASPI V.M. and VAN DER KLIS M.

Abstract (from CDS):

We report on the Chandra X-Ray Observatory ACIS-S3 imaging observation of the Galactic globular cluster M4 (NGC 6121). We detect 12 X-ray sources inside the core and 19 more within the cluster half-mass radius. The limiting luminosity of this observation is LX~1029 ergs/s for sources associated with the cluster, the deepest X-ray observation of a globular cluster to date. We identify six X-ray sources with known objects and use ROSAT observations to show that the brightest X-ray source is variable. Archival data from the Hubble Space Telescope allow us to identify optical counterparts to 16 X-ray sources. Based on the X-ray and optical properties of the identifications and the information from the literature, we classify two (possibly three) sources as cataclysmic variables, one X-ray source as a millisecond pulsar, and 12 sources as chromospherically active binaries. Comparison of M4 with 47 Tuc and NGC 6397 suggests a scaling of the number of active binaries in these clusters with the cluster (core) mass.

Abstract Copyright: ∼

Journal keyword(s): Stars: Binaries: Close - Galaxy: Globular Clusters: General - Galaxy: Globular Clusters: Individual: Messier Number: M4 - Galaxy: Globular Clusters: Individual: NGC Number: NGC 6121 - Stars: Novae, Cataclysmic Variables - X-Rays: Stars

Nomenclature: Table 1: [BPH2004] CX NN (Nos 1-31).

Errata: Addendum vol. 619, p. 1189 (2005)

CDS comments: Table 1 : CX 9w is a misprint for CX 9

Simbad objects: 45

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Number of rows : 45
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 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
3 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
4 [BPH2004] CX 29 X 16 23 19.486 -26 31 43.39           ~ 1 0
5 Cl* NGC 6121 SAW V63 EB* 16 23 21.0264063995 -26 33 25.211042714 18.97 18.82 17.80 17.14 16.49 ~ 7 0
6 Cl* NGC 6121 SAW V66 EB* 16 23 25.5423829536 -26 29 11.800992372 17.98 17.77 16.93 16.37 15.77 ~ 17 0
7 [BPH2004] CX 14 X 16 23 25.948 -26 33 54.62           ~ 1 0
8 UCAC3 127-192903 EB* 16 23 28.395 -26 30 21.88 17.57 17.931 17.028 15.90 15.01 ~ 12 0
9 [BPH2004] CX 19 X 16 23 28.953 -26 29 51.47           ~ 1 0
10 [BPH2004] CX 31 X 16 23 29.424 -26 30 00.19           ~ 1 0
11 Cl* NGC 6121 SAW V69 EB* 16 23 31.34 -26 31 48.4 18.27 18.18 17.32 16.74 16.21 ~ 7 0
12 Cl* NGC 6121 SAW V71 El* 16 23 31.51 -26 30 57.5 17.84 17.67 16.70 16.03 15.39 ~ 6 0
13 [BPH2004] CX 11 V* 16 23 32.40 -26 30 45.5           ~ 2 0
14 Cl* NGC 6121 SAW V70 EB* 16 23 33.28 -26 31 08.0   17.97 17.03     ~ 6 0
15 [BPH2004] CX 27 * 16 23 33.290 -26 31 57.81           ~ 1 0
16 [BPH2004] CX 22 * 16 23 33.362 -26 31 45.65           ~ 1 0
17 [BPH2004] CX 25 EB* 16 23 33.451 -26 32 30.00           ~ 2 0
18 [BPH2004] CX 16 X 16 23 33.682 -26 34 17.27           ~ 1 0
19 [BPH2004] CX 1 V* 16 23 34.15 -26 31 34.6     20.38     ~ 14 1
20 [BPH2004] CX 9 X 16 23 34.224 -26 29 55.69           ~ 3 0
21 1AXG J162333-2631 X 16 23 34.24 -26 31 41.8           ~ 4 0
22 Cl* NGC 6121 SAW V77 V* 16 23 34.276 -26 29 55.95 16.32 15.83 14.66 13.92 23.21 ~ 8 0
23 [BPH2004] CX 4 CV* 16 23 34.321 -26 30 39.27           ~ 5 0
24 Cl* NGC 6121 SAW V68 EB* 16 23 34.35 -26 32 01.8 19.32 18.26 17.03 16.26 15.49 ~ 7 0
25 [BPH2004] CX 21 EB* 16 23 34.60 -26 32 04.6           ~ 2 0
26 [BPH2004] CX 28 EB* 16 23 34.99 -26 32 24.2           ~ 2 0
27 [BPH2004] CX 10 * 16 23 35.047 -26 31 19.18           ~ 1 0
28 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
29 [BPH2004] CX 17 X 16 23 35.975 -26 31 01.89           ~ 1 0
30 Cl* NGC 6121 SAW V67 EB* 16 23 36.81 -26 31 44.1 17.27 17.12 16.25 15.65 15.09 ~ 10 0
31 [BPH2004] CX 20 EB* 16 23 36.90 -26 31 39.2           ~ 2 0
32 [BPH2004] CX 6 * 16 23 38.058 -26 29 21.81           ~ 1 0
33 [BPH2004] CX 3 EB? 16 23 38.09 -26 31 37.8           ~ 2 0
34 PSR B1620-26 Psr 16 23 38.2218 -26 31 53.769     21.30     ~ 318 2
35 Cl* NGC 6121 SAW V72 EB* 16 23 38.4880359196 -26 32 10.911560523 16.76 16.46 15.83 15.40 15.01 ~ 31 0
36 [BPH2004] CX 26 * 16 23 38.884 -26 31 48.26           ~ 1 0
37 [BPH2004] CX 23 CV* 16 23 40.189 -26 29 26.10           ~ 2 0
38 [BPH2004] CX 24 CV* 16 23 42.096 -26 31 37.03           ~ 2 0
39 Cl* NGC 6121 SAW V74 EB* 16 23 45.7665203672 -26 31 16.618005015 17.64 17.70 16.87 16.31 15.72 ~ 8 0
40 NGC 6121 31 SB* 16 23 45.8297330232 -26 28 54.637906116   13.50 12.58 12.54   ~ 6 0
41 [BPH2004] CX 2 CV* 16 23 46.399 -26 31 15.67           ~ 5 1
42 Cl* NGC 6121 SAW V73 EB* 16 23 50.9432955835 -26 34 42.162280377 18.90 18.72 17.78 17.14 16.54 ~ 6 0
43 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
44 NGC 6440 GlC 17 48 52.67 -20 21 34.5           ~ 592 0
45 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0

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