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The X-ray binary populations of M81 and M82

  • Paul H. Sell (a1) (a2), Andreas Zezas (a1) (a2), Stephen J. Williams (a1) (a2), Jeff J. Andrews (a1) (a2), Kosmas Gazeas (a3), John S. Gallagher (a4) and Andrew Ptak (a5)...


We use deep Chandra and HST data to uniquely classify the X-ray binary (XRB) populations in M81 on the basis of their donor stars and local stellar populations (into early-type main sequence, yellow giant, supergiant, low-mass, and globular cluster). First, we find that more massive, redder, and denser globular clusters are more likely to be associated with XRBs. Second, we find that the high-mass XRBs (HMXBs) overall have a steeper X-ray luminosity function (XLF) than the canonical star-forming galaxy XLF, though there is some evidence of variations in the slopes of the sub-populations. On the other hand, the XLF of the prototypical starburst M82 is described by the canonical powerlaw (αcum ∼ 0.6) down to LX ∼ 1036 erg s−1. We attribute variations in XLF slopes to different mass transfer modes (Roche-lobe overflow versus wind-fed systems).



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The X-ray binary populations of M81 and M82

  • Paul H. Sell (a1) (a2), Andreas Zezas (a1) (a2), Stephen J. Williams (a1) (a2), Jeff J. Andrews (a1) (a2), Kosmas Gazeas (a3), John S. Gallagher (a4) and Andrew Ptak (a5)...


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