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Chandra Observation of the Globular Cluster NGC 6440 and the Nature of Cluster X-ray Luminosity Functions | | David Pooley
; Walter H. G. Lewin
; Frank Verbunt
; Lee Homer
; Bruce Margon
; Bryan M. Gaensler
; Victoria M. Kaspi
; Jon M. Miller
; Derek W. Fox
; Michiel van der Klis
; | | Date: |
12 Nov 2001 | | Subject: | astro-ph | | Affiliation: | 6,1), Jon M. Miller , Derek W. Fox , Michiel van der Klis (MIT, Utrecht, Univ. Washington, Seattle, STScI, CfA, McGill, Caltech, Univ. Amsterdam | | Abstract: | 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. | | Source: | arXiv, astro-ph/0111212 | | Services: | Forum | Review | PDF | Favorites | |
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