Chandra Observations of Luminous Globular Cluster X-ray Sources in M31

Details Chandra Observations of Luminous Globular Cluster X-ray Sources in M31 Chandra Observations of Luminous Globular Cluster X-ray Sources in M31

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.2707k&link_type=abstract

American Astronomical Society, 198th AAS Meeting, #27.07; Bulletin of the American Astronomical Society, Vol. 33, p.823

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the results of a series of Chandra observations of globular cluster (GC) X-ray sources in M31. Among some 20 GC X-ray sources detected in our M31 observations, 2-3 of them show super-Eddington luminosity (> 1038 erg s-1). It is an interesting fact that the highest X-ray luminosities achieved by Galactic GCs are only several times 1037 erg s-1, and that none are black hole candidates. There are several possible explanations for such a large luminosity: 1) there are multiple sources; 2) the source is a black hole; 3) the flux is beamed. In addition, metallicity can account for higher luminosities than the standard Eddington limit. Some of the M31 GC X-ray sources are also variables and show transient behavior. By combining all the available archival data, we compare the properties of these sources to those Galactic GC X-ray sources.

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