A multiwavelength study of the globular cluster NGC 2808 with Chandra, XMM-Newton, HST and ATCA observations

Details A multiwavelength study of the globular cluster NGC 2808 with Chandra, XMM-Newton, HST and ATCA observations A multiwavelength study of the globular cluster NGC 2808 with Chandra, XMM-Newton, HST and ATCA observations

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe.194s&link_type=abstract

Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo

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Globular Clusters

Scientific paper

We present a Chandra X-ray observation of the Galactic globular cluster NGC 2808. Previous observations with XMM-Newton and ultraviolet observations with the Hubble Space Telescope are re-investigated to help identify the Chandra sources associated with the cluster. This data is used to identify the faint X-ray sources belonging to this globular cluster in order to understand their role in the evolution of globular clusters. From statistical analysis, 16 sources are very likely to be linked to NGC 2808. We find one likely neutron star low-mass X-ray binary in quiescence and 8 cataclysmic variable candidates in the core of NGC 2808. The other sources are also cataclysmic variable candidates, but some of the faintest could possibly be chromospherically active binaries or millisecond pulsars. This significant population of close binaries is likely to play an important role in slowing down the core collapse of this cluster. We find a possible deficit of X-ray sources compared to 47 Tuc which could be related to the metallicity content and the complexity of the evolution of NGC 2808. From X-ray and radio (ATCA) observations, we find no evidence of an intermediate mass black hole in NGC 2808 and derive mass constraints.

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