Chandra Observations of Globular Clusters

Details Chandra Observations of Globular Clusters Chandra Observations of Globular Clusters

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprb17065p&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

We will summarize our Chandra observations of the globular clusters NGC 6752, 6440, and 6121 and compare with Chandra observations of other clusters (47 Tuc, NGC 6397, etc.). Already, the number of low-luminosity globular cluster X-ray sources in the few clusters observed with Chandra is 4--5 times the number of all such sources found in ROSAT observations of 55 clusters. With at least tens of Chandra sources in each cluster, we can begin to make meaningful comparisons among the clusters. The Chandra data reveal differences in the luminosity functions; the slopes may be anticorrelated with the central densities of the clusters. We suggest that a higher central density could enhance the neutron star capture rate which would in turn give rise to a higher number of low-mass X-ray binaries (thus increasing the more luminous end of the population) and also destroy RS CVn systems and cataclysmic variables by neutron star encounters (thus decreasing the less luminous end of the population).

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