Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344407l&link_type=abstract
American Astronomical Society, AAS Meeting #213, #444.07; Bulletin of the American Astronomical Society, Vol. 41, p.327
Other
Scientific paper
We present a preliminary X-ray study of the Sombrero Galaxy (M104), based on our new Chandra/ACIS-I observations with a total exposure of 180 ksec.
More than 200 discrete source are detected within the optical extent of thegalaxy, most of which are thought to be low-mass X-ray binaries (LMXBs).
We find that the 2-8 keV unresolved emission closely traces the near-IR K-band light, indicating an origin primarily in the old stellar population, in particular coronally active binaries (ABs) and cataclysmic variables (CVs) as suggested by previous X-ray studies of the Galactic bulge, M31, M32 and NGC3379. The 0.5-2 keV unresolved emission, on the other hand, has a greater amount than expected from the collective emission of ABs and CVs, particularly evidenced by its spatial extent much broader than that of the K-band starlight. We suggest that this excess of 0.5-2 keV emission arises from truly diffuse hot gas, supplied by stellar mass loss and energized by Type Ia supernovae and/or the moderately-active nucleus. Our step is to study the dynamicsof the gas with theorectical models.
Jones Christine
Li Zhiyuan
Wang Qiangguo
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