2002ApJ...573..184P

Query : 2002ApJ...573..184P

2002ApJ...573..184P - Astrophys. J., 573, 184-190 (2002/July-1)

Chandra observation of the globular cluster NGC 6440 and the nature of cluster X-ray luminosity functions.

POOLEY D., LEWIN W.H.G., VERBUNT F., HOMER L., MARGON B., GAENSLER B.M., KASPI V.M., MILLER J.M., FOX D.W. and VAN DER KLIS M.

Abstract (from CDS):

As part of our campaign to determine the nature of the various source populations of the low-luminosity globular cluster X-ray sources, we have obtained a Chandra X-Ray Observatory ACIS-S3 image of the globular cluster NGC 6440. We detect 24 sources to a limiting luminosity of ∼2x1031 ergs.s–1 (0.5-2.5 keV) inside the cluster's half-mass radius, all of which lie within ∼2 core radii of the cluster center. We also find excess emission in and around the core that could be due to unresolved point sources. Based on X-ray luminosities and colors, we conclude that there are 4-5 likely quiescent low-mass X-ray binaries and that most of the other sources are cataclysmic variables. We compare these results to Chandra results from other globular clusters and find the X-ray luminosity functions differ among the clusters.

Abstract Copyright: ∼

Journal keyword(s): Stars: Binaries: Close - Galaxy: Globular Clusters: Individual: NGC Number: NGC 6440 - novae cataclysmic variables - Stars: Neutron

Nomenclature: Table 2: [PLV2002] CXNN (Nos CX1-CX24). Table 3: [PLV2002] A (Nos A-C).

Simbad objects: 37

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Number of rows : 37
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 1A 0620-00 HXB 06 22 44.5423857312 -00 20 44.290460544           K3V-K7V 1144 0
3 BD+12 1917 V* 08 49 56.8183190424 +11 41 32.987890788   11.2 9.782   8.540 K3III 78 1
4 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
5 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
6 V* V822 Cen LXB 14 58 21.9347842080 -31 40 07.515432768 11.95 12.85 12.8     K3-K7V 555 0
7 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
8 [KGB96] NGC 6440 2 Rad 17 48 46.31 -20 21 35.9           ~ 3 0
9 [KGB96] NGC 6440 3 Rad 17 48 47.96 -20 19 58.5           ~ 3 0
10 [RTB2002] J174851.87-202133.9 LXB 17 48 51.870 -20 21 33.85           ~ 7 0
11 [RTB2002] J174851.98-202146.7 CV* 17 48 51.987 -20 21 46.57           ~ 5 0
12 [PLV2002] CX23 CV* 17 48 52.083 -20 21 23.63           ~ 2 0
13 [PLV2002] CX1 LXB 17 48 52.163 -20 21 32.40           ~ 213 1
14 [PLV2002] CX15 CV* 17 48 52.310 -20 21 34.33           ~ 3 0
15 [RTB2002] J174852.41-202132.2 LXB 17 48 52.419 -20 21 32.00           ~ 11 0
16 OGLE BLG-LPV-251261 Mi* 17 48 52.4246624943 -20 21 38.724402757     17.037   13.053 ~ 8 0
17 [PLV2002] CX14 CV* 17 48 52.537 -20 21 34.73           ~ 2 0
18 [PLV2002] CX18 CV* 17 48 52.581 -20 21 32.62           ~ 2 0
19 [RTB2002] J174852.64-202140.6 LXB 17 48 52.625 -20 21 40.50           ~ 8 0
20 NGC 6440 GlC 17 48 52.67 -20 21 34.5           ~ 592 0
21 [PLV2002] CX17 CV* 17 48 52.676 -20 21 36.70           ~ 2 0
22 PSR B1745-20A Psr 17 48 52.689 -20 21 39.70     10.55     ~ 47 1
23 [PLV2002] CX19 CV* 17 48 52.712 -20 21 38.24           ~ 3 0
24 [PLV2002] CX16 CV* 17 48 52.734 -20 21 41.56           ~ 2 0
25 [RTB2002] J174852.85-202134.1 CV* 17 48 52.852 -20 21 33.64           ~ 5 0
26 [RTB2002] J174852.87-202142.5 LXB 17 48 52.874 -20 21 42.61           ~ 8 0
27 [PLV2002] CX10 LXB 17 48 52.874 -20 21 31.31           ~ 6 0
28 [PLV2002] CX11 CV* 17 48 52.888 -20 21 35.53           ~ 2 0
29 [PLV2002] CX20 CV* 17 48 52.896 -20 21 49.85           ~ 2 0
30 [RTB2002] J174852.93-202139.1 CV* 17 48 52.939 -20 21 39.56           ~ 3 0
31 [RTB2002] J174853.12-202127.0 LXB 17 48 53.123 -20 21 27.03           ~ 7 0
32 [RTB2002] J174853.17-202138.7 LXB 17 48 53.181 -20 21 38.78           ~ 9 0
33 [PLV2002] CX21 CV* 17 48 53.210 -20 21 33.39           ~ 2 0
34 [PLV2002] CX22 CV* 17 48 53.225 -20 21 44.01           ~ 2 0
35 [RTB2002] J174853.32-202141.7 CV* 17 48 53.320 -20 21 41.70           ~ 4 0
36 V* V1223 Sgr CV* 18 55 02.3108012664 -31 09 49.584656268           ~ 347 0
37 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0

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