Physics
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xmm..prop..180t&link_type=abstract
XMM-Newton Proposal ID #04048504
Physics
Galaxies, Galactic Surveys, M31-Ec-R, M31-Ec-S, M31-Ec-T, M31-Ec-W, Xmm-Newton Proposal 04048504
Scientific paper
We have recently discovered a population of old star clusters in the far halo of M31 which, whilst having colours and magnitudes typical of classical GCs, are significantly more extended spatially. These clusters have no known analogue in the MW or elsewhere. Their origin remains a mystery, and we seek to study their X-ray properties to shed light on their current state and past evolution. For example, if these clusters formed as diffuse systems, their relatively low stellar densities would lead us to expect a lower X- ray source population. Conversely, they may have 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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