Other
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phdt.........1g&link_type=abstract
PhD Thesis, Centre d'Etude Spatiale des Rayonnements
Other
1
Globular Clusters (Omega Cen, M13, M22, Ngc 6366), X-Ray, Spectral And Timing Analysis, Astrometric Corrections, Binary Formation, Low Mass X-Ray Binaries
Scientific paper
Globular clusters contain two classes of X-ray sources: sources with high luminosities (Lx>1036 ergs/s), which are low mass X-ray binaries identical to those located within the galactic disk; and low luminosity sources (Lx<1034.5 ergs/s), which comprise several types of objects, most of which are binary systems, where the matter being accreted onto one of the binary components (a neutron star, a white dwarf) is responsible for the X-ray emission observed.
Determining the globular cluster X-ray source populations thus allows one to study the formation mechanisms of binary systems, which play a fundamental role in the evolution of globular clusters by maintaining their dynamical equilibrium.
This thesis is devoted to the study of the X-ray source populations of four globular clusters observed by XMM-Newton and/or Chandra : w Cen, M13, M22 and NGC 6366. We have used this sample to test the binary formation scenario as a function of the mass, size and stellar density of the clusters.
We have associated several faint X-ray sources with each cluster (30, 5, 2, 1 respectively). These sources are located within or near the core of the clusters, but we have also detected a significant excess of sources in the outer regions of the cluster w Cen. In addition we have discovered a low mass X-ray binary with a neutron star primary in M13 (and we have tried to identify the optical counterpart in archival HST data).
We show that the number of low mass X-ray binaries with neutron star primaries is correlated with the stellar encounter rates in globular clusters. This may indicate that these binaries are formed through gravitational interactions. We have also studied the formation mechanisms of the other binary systems in globular clusters.
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