The X-ray binary population in M33: I. Source list and luminosity function

Details The X-ray binary population in M33: I. Source list and luminosity function The X-ray binary population in M33: I. Source list and luminosity function

2005-06-15

arxiv.org/abs/astro-ph/0506353v2

Astronomy and Astrophysics

Astrophysics

51 pages, accepted for ApJS, accepted version

Scientific paper

10.1086/468185

In this paper we present the source list for 3 Chandra observations of the Local Group galaxy M33. The observations are centered on the nucleus and on the star forming region NGC 604. We detect a total of 261 sources in an area of \~0.2 square degree down to a flux limit of 3*10^{-16} erg/s/cm^2 which corresponds to a luminosity of ~2*10^34 erg/s at a distance of 840 kpc. From the source list we construct the luminosity functions of sources observed in M33. Taking into account background contamination the luminosity functions are consistent with those of other star forming galaxies. In addition, the combination of X-ray color analysis and the existence of ``blue'' optical counterparts strongly indicate that the X-ray point source population in M33 consists of young objects. Above 3*10^35 erg/s there are few X-ray sources in the locus of the X-ray hardness ratio diagram that is generally populated by LMXBs.

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