2003ApJ...590..809H

Query : 2003ApJ...590..809H

2003ApJ...590..809H - Astrophys. J., 590, 809-821 (2003/June-3)

A Chandra X-ray study of the dense globular cluster Terzan 5.

HEINKE C.O., EDMONDS P.D., GRINDLAY J.E., LLOYD D.A., COHN H.N. and LUGGER P.M.

Abstract (from CDS):

We report a Chandra ACIS-I observation of the dense globular cluster Terzan 5. The previously known transient low-mass X-ray binary (LMXB) EXO 1745-248 in the cluster entered a rare high state during our 2000 August observation, complicating the analysis. Nevertheless, nine additional sources clearly associated with the cluster are also detected, ranging from LX(0.5-2.5keV)=5.6x1032 down to 8.6x1031 ergs/s. Their X-ray colors, luminosities, and spectral fitting indicate that five of them are probably cataclysmic variables and four are likely quiescent LMXBs containing neutron stars. We estimate the total number of sources between LX(0.5-2.5keV)=1032 and 1033 ergs/s as 11.4+4.7–1.8by the use of artificial point source tests and note that the numbers of X-ray sources are similar to those detected in NGC 6440. The improved X-ray position allowed us to identify a plausible infrared counterpart to EXO 1745-248 on our 1998 Hubble Space Telescope NICMOS images. This blue star (F110W=18.48, F187W=17.30) lies within 0".2 of the boresighted LMXB position. Simultaneous Rossi X-Ray Timing Explorer spectra, combined with the Chandra spectrum, indicate that EXO 1745-248 is an ultracompact binary system and show a strong broad 6.55 keV iron line and an 8 keV smeared reflection edge.

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Journal keyword(s): Galaxy: Globular Clusters: Individual: Name: Terzan 5 - Stars: Novae, Cataclysmic Variables - Stars: Neutron - X-Rays: Binaries - X-Rays: Individual: Alphanumeric: EXO 1745-248

Nomenclature: Fig.2, Table 1, col(2): [HEG2003] WNN (Nos W2-W10) = Table 1, col(1): CXOGlb JHHMMSS.s+DDMMSS N=9, [HEG2003] Star N (Nos 1-2).

CDS comments: p.811: source S2 of Johnston + 1995 is EQ J174734.4-244558 in SIMBAD.

Simbad objects: 40

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Number of rows : 40
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 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
3 4U 1323-62 LXB 13 26 37.0 -62 08 09           ~ 192 0
4 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
5 V* QX Nor LXB 16 12 43.0 -52 25 26           ~ 946 1
6 RX J1709.5-2639 LXB 17 09 30.5 -26 39 26           ~ 130 0
7 ESO 454-29 GlC 17 27 33.24 -30 48 07.8           ~ 278 0
8 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
9 NAME Terzan 5 S2 X 17 47 34.4729673552 -24 45 56.745940860           ~ 3 0
10 CXOU J174751.7-244657 X 17 47 51.726 -24 46 57.42           ~ 1 0
11 PSR B1744-24A Psr 17 48 02.249 -24 46 37.65           ~ 235 0
12 2MASS J17480336-2448543 * 17 48 03.3594420792 -24 48 54.299662596   15.3   13.2 13.2 ~ 3 0
13 [HEG2003] W10 CV* 17 48 03.539 -24 46 49.24           ~ 3 0
14 CXOGlb J174804.0-244640 CV* 17 48 04.059 -24 46 40.53           ~ 2 0
15 CXOGlb J174804.2-244641 CV* 17 48 04.214 -24 46 41.79           ~ 2 0
16 [HEG2003] W8 X 17 48 04.225 -24 46 48.34           ~ 4 0
17 [HEG2003] W6 CV* 17 48 04.366 -24 47 03.75           ~ 3 0
18 [HEG2003] W5 CV* 17 48 04.394 -24 46 38.24           ~ 4 0
19 PSR J1748-2446C Psr 17 48 04.534 -24 46 34.70           ~ 24 0
20 CXOGlb J174804.7-244644 X 17 48 04.799 -24 46 44.64           ~ 2 0
21 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 948 1
22 Cl* Terzan 5 EGC V2 RR* 17 48 05.06 -24 46 52.5           ~ 4 0
23 Cl* Terzan 5 EGC V1 RR* 17 48 05.127 -24 46 38.58         18.367 ~ 5 0
24 NAME TER 5 X-1 LXB 17 48 05.225 -24 46 47.66           ~ 229 1
25 [HWC2006] CX 2 X 17 48 05.370 -24 46 37.66           ~ 9 0
26 [HEG2003] W2 X 17 48 06.154 -24 46 42.68           ~ 7 0
27 CXOU J174812.6-244811 * 17 48 12.649 -24 48 11.10           ~ 1 0
28 CXOU J174814.7-244802 X 17 48 14.703 -24 48 02.21           ~ 1 0
29 NGC 6440 GlC 17 48 52.67 -20 21 34.5           ~ 592 0
30 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 940 0
31 Cl Terzan 6 GlC 17 50 47.02873 -31 16 29.6900           ~ 214 0
32 SAX J1808.4-3658 LXB 18 08 27.58 -36 58 43.9           ~ 1051 0
33 V* V5512 Sgr LXB 18 14 31.3 -17 09 23     12.73     K5III 449 0
34 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 939 1
35 X Sgr X-4 LXB 18 23 40.57 -30 21 40.6   19.06 18.81     ~ 1056 1
36 PSR J1824-2452A Psr 18 24 32.009 -24 52 11.10           ~ 529 2
37 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 821 0
38 NGC 6652 GlC 18 35 45.63 -32 59 26.6           ~ 474 0
39 NGC 6712 GlC 18 53 04.32 -08 42 21.5           ~ 550 0
40 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0

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