Identifying the faint X-ray sources in the globular cluster NGC 2808 with XMM-Newton

Details Identifying the faint X-ray sources in the globular cluster NGC 2808 with XMM-Newton Identifying the faint X-ray sources in the globular cluster NGC 2808 with XMM-Newton

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..191s&link_type=abstract

SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.

Astronomy and Astrophysics

Astrophysics

Scientific paper

Globular clusters (GCs) are believed to contain a large number of interacting binaries which are thought to delay the ineluctable core collapse of these high-density clusters. However over-crowding in the optical domain makes their detection difficult, and the nature of this population remains largely unknown. Using X-rays, it is possible to detect most of the interacting binaries and their products such as low mass X-ray binaries (LMXBs) often in quiescence (qLMXBs), cataclysmic variables (CVs), millisecond pulsars (MSPs), as well as active binaries (ABs).
We present an analysis of the globular cluster NGC 2808 using a 42 ks XMM-Newton observation. We show that at least seven X-ray sources are associated with the cluster, and show evidence that these are indeed interacting binaries. The brightest source in the innermost region has X-ray emission characteristics of a cataclysmic variable for which we have possibly detected the spin period of the white dwarf, indicating an intermediate polar. Two X-ray sources, including the brightest one, have a ultra-violet counterpart. Finally, we have detected at least one qLMXB.

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