Other
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.1207l&link_type=abstract
American Astronomical Society, HEAD meeting #11, #12.07
Other
Scientific paper
We present a preliminary X-ray study of the nearby
early-type spiral galaxy M81, based on
archival Chandra observations. Down to a
luminosity limit of 1e36 erg/s, around 200 discrete sources are detected within the optical extent of the galaxy, including the moderately-active nucleus and the majority of X-ray binaries.
The unresolved hard (above 2 keV) X-ray emission closely traces the near-IR starlight, indicating a primary origin in old stellar populations, in particular coronally active binaries (ABs) and cataclysmic variables (CVs) as suggested by recent studies. The
soft unresolved emission, on the other hand, has a greater flux as well
as a broader spatial
extent than that expected from stellar emission. We suggest that
this excess of soft X-ray emission, with an estimated luminosity
of about 1e39 erg/s, arises from truly diffuse hot
gas, most likely heated by supernovae and possibly the nucleus. Studies
of such feedback processes have strong implications for understanding
the co-spatial evolution of the supermassive black hole (SMBH), stellar spheroid and ISM.
Forman William
Jones Christine
Kraft Ralph
Li Zhiyuan
Wang Dongming
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