Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19915906p&link_type=abstract
American Astronomical Society, 199th AAS Meeting, #159.06; Bulletin of the American Astronomical Society, Vol. 34, p.569
Other
Scientific paper
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 x 1031 erg 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 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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