Mathematics – Probability
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1010..394m&link_type=abstract
A POPULATION EXPLOSION: The Nature & Evolution of X-ray Binaries in Diverse Environments. AIP Conference Proceedings, Volume 10
Mathematics
Probability
X-Ray Sources, X-Ray Bursts, Galactic Nuclei, Circumnuclear Matter, And Bulges, Stellar Clusters And Associations, Infall, Accretion, And Accretion Disks
Scientific paper
We investigate the evolution of the properties of model populations of ultraluminous X-ray sources (ULXs) consisting of a black-hole accretor in a binary with a donor star. We have computed models corresponding to two different populations of black-hole binaries: one invokes stellar-mass (~10 Msolar) black hole accretors (LMBHs), and the second utilizes intermediate-mass (~1000 Msolar) black holes (IMBHs). For each of the two populations, we computed 30,000 binary evolution sequences using a full Henyey stellar evolution code. The optical flux from the model ULXs includes contributions from the donor star and the accretion disk (the latter being due to X-ray irradiation as well as intrinsic viscous heating). We present ``probability images'' for the ULX systems in planes of color-magnitude, orbital period vs. X-ray luminosity, and luminosity vs. evolution time. Estimates of the numbers of ULXs in a typical galaxy as a function of X-ray luminosity are also presented. Our model CMDs are compared with six ULX counterparts that have been discussed in the literature. Overall, the observed systems seem more closely related to model systems with very high-mass donors (>~25 Msolar) in binaries with IMBH accretors. However, significant difficulties remain with both the IMBH and stellar-mass black hole models.
Madhusudhan Nikku
Nelson Lorne
Podsiadlowski Ph
Rappaport Saul
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