X-ray Source Populations in Nearby Galaxies

Physics

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X-Ray Sources, X-Ray Bursts, Galactic Center, Bar, Circumnuclear Matter, And Bulge, Absolute And Relative Intensities, Origin, Formation, And Abundances Of The Elements

Scientific paper

We discuss recent results from X-ray observations of nearby spiral and star-forming galaxies. We find evidence for variations between the X-ray luminosity functions (XLFs) of the X-ray source populations associated with Main Sequence and more evolved stars. We also find evidence for differences between the XLFs of sources in nearby star-forming galaxies with stellar populations of different ages. These results indicate that although the XLFs of star-forming galaxies are characterized in general by a flat XLF, there are variations related to the age and the type of the dominant X-ray binary populations. Finally we present increasing evidence that single observations of galaxies provide a representative picture of their XLF despite the variability of the individual X-ray sources.

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