Swift-BAT Survey of Galactic Sources: Catalog and Properties of the
  populations
  We study the populations of X-ray sources in the Milky Way in the 15-55 keV
band using a deep survey with the BAT instrument aboard the Swift observatory.
We present the logN-logS distributions of the various source types and we
analyze their variability and spectra. For the low-mass X-ray binaries (LMXBs)
and the high-mass X-ray binaries (HMXBs) we derive the luminosity functions to
a limiting luminosity of L_X~7 times10^{34} erg s/s. Our results confirm the
previously found flattening of the LMXB luminosity function below a luminosity
of L_X~10^{37} erg s/s. The luminosity function of the HMXBs is found to be
significantly flatter in the 15-55 keV band than in the 2-10 keV band. From the
luminosity functions we estimate the ratios of the hard X-ray luminosity from
HMXBs to the star-formation rate, and the LMXB luminosity to the stellar mass.
We use these to estimate the X-ray emissivity in the local universe from X-ray
binaries and show that it constitutes only a small fraction of the hard X-ray
background.
