Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-11-12
Astronomy and Astrophysics
Astrophysics
9 pages, 4 figures, accepted by ApJ, minor changes, added table of clusters' physical parameters
Scientific paper
10.1086/340498
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 ~2 times 10^31 erg/s (0.5-2.5keV) 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 which could be due to unresolved point sources. Based upon 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.
Fox Derek W.
Gaensler Bryan M.
Homer Lee
Kaspi Victoria M.
Lewin Walter H. G.
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