The X-ray binary population in the M33

Mathematics – Logic

Scientific paper

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Scientific paper

We present an investigation of the X-ray binary population of the Local Group galaxy M33. M33 is a ``missing link'' in galaxy populations observed with Chandra. Morphologically it lies between early-type spiral galaxies (M31, Milky Way) and dwarf galaxies (SMC, IC 1613). M33's proximity (840 kpc) and low line-of-sight column density (NH ˜ 6 × 1020 cm2) provide unique advantages for the study of the X-ray population of a spiral galaxy: It provides the same amount of detail as achievable in M31 and allows the study of a luminosity range unaccessible in more distant galaxies and more difficult to observe in either the MW, M31 or LMC/SMC. Moreover, the higher star formation rate results in a different population of X-ray sources compared to the MW or M31.
Here we present the luminosity function of X-ray point sources, ranging from a few 1035 - 1038 erg/s. We use optical identifications and other properties of the X-ray sources to study the population in greater detail. The results are compared with other galaxies, mainly the Milky Way and M31.
We acknowledge support by NASA grant GO2-3135X.

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