Probing the X-ray properties of Extend Star Clusters in the far Halo of M31We ha

Details Probing the X-ray properties of Extend Star Clusters in the far Halo of M31We ha Probing the X-ray properties of Extend Star Clusters in the far Halo of M31We ha

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006xmm..prop..212t&link_type=abstract

XMM-Newton Proposal ID #05059004

Computer Science

Galaxies, Galactic Surveys, M31-Ec-R, M31-Ec-S, M31-Ec-T, M31-Ec-W, Xmm-Newton Proposal 05059004

Scientific paper

We have recently discovered a population of old star clusters in the halo of M31 which have colours and magnitudes typical of GCs but are much more extended spatially. These clusters have no known analogue in the Milky Way and their origin remains a mystery. We seek to study their X-ray properties distinguish between competing scenarios for their evolution. For example, if these clusters formed as diffuse systems, their relatively low stellar densities would lead us to expect a low X-ray source population, and raise the question, do they have dark matter halos? Alternatively have they been heated to their current state by a large population of binaries and/or black holes, which would make these clusters rich X-ray sources and viable test beds of modified gravitational theories.

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