Chandra observations of the globular cluster M54
arXiv:astro-ph/0510217 · doi:10.1051/0004-6361:20053855
Abstract
We have carried out a Chandra observation of the globular cluster M54. We detected 7 sources located within the half-mass radius of M54, at a flux limit of 1.5x10^-15 erg/s/cm in the 0.3-8 keV energy band. The spatial distribution and the colour/spectral properties of the 7 sources suggest that they are likely to be cataclysmic variables or LMXBs in the globular cluster. M54 shows the largest number of X-ray sources with luminosities greater than 10^32 ergs/s compared to other globular clusters observed using Chandra and XMM-Newton. We searched for a correlation between the number of sources above this luminosity level with globular cluster parameters. We found evidence that the number of sources peaks at a King concentration parameter c~1.7-1.9, with globular clusters which are core-collapsed or have low-c values having a smaller number of sources. We speculate on possible reasons for this.
Accepted A&A, 5 pages
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- A search for stellar X-ray sourcesin the Sagittarius and Carina dwarf galaxies - I: X-ray observations
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