Swift-BAT Survey of Galactic Sources: Catalog and Properties of the populations

Abstract

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.

21 pages, accepted by ApJ

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• The 70 Month Swift-BAT All-Sky Hard X-Ray Survey
• Three years Swift-BAT Survey of AGN: reconciling theory and observations?
• X-ray Binary Evolution Across Cosmic Time
• High-Mass X-ray Binaries in the Milky Way: A closer look with INTEGRAL
• The 60-month all-sky BAT Survey of AGN and the Anisotropy of Nearby AGN
• Population of persistent high mass X-ray binaries in the Milky Way
• Advances in Understanding High-Mass X-ray Binaries with INTEGRAL and Future Directions
• Optical and X-ray Studies of Ten X-ray Selected Cataclysmic Binaries
• Population synthesis of classical low-mass X-ray binaries in the Galactic Bulge
• Unbeamed tidal disruption events at hard X-rays
• Probing the X-Ray Binary Populations of the Ring Galaxy NGC 1291
• Black Holes and Neutron Stars in Nearby Galaxies: Insights from NuSTAR
• Population of the Galactic X-ray binaries and eRosita
• Expected number of supergiant fast X-ray transients in the Milky Way
• The AT20G view of Swift/BAT selected AGN: high-frequency radio waves meet hard X-rays
• Galactic Sources Detected in the NuSTAR Serendipitous Survey
• Revisiting SWJ2000.6+3210 : A persistent Be X-ray pulsar ?
• The populations of hard X- and γ-ray sources: a correlation study and new possible identifications
• Effects of variability of X-ray binaries on the X-ray luminosity functions of Milky Way
• A NuSTAR Census of the X-ray Binary Population of the M31 Disk