Astronomy and Astrophysics – Astronomy
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.5007p&link_type=abstract
American Astronomical Society, 198th AAS Meeting, #50.07; Bulletin of the American Astronomical Society, Vol. 33, p.858
Astronomy and Astrophysics
Astronomy
1
Scientific paper
A Chandra guaranteed-time program is surveying an H-alpha selected sample of galaxies, most of which are known to harbor a low-luminosity AGN or starburst. I will report on the detection rate of IXOs in these galaxies and their X-ray color properties. Preliminary results suggest that the detection rate is ~ 0-1 IXO per galaxy, with more active galaxies tending to have more candidates. Similarly, a survey of HRI data from nearby galaxies also suggests that starburst galaxies tend to have an enhanced number of IXOs. One possibility is that ``top-heavy'' IMFs in starburst galaxies result in progenitor stars sufficiently massive to produce black holes exceeding 10Msun more often than is the case with normal (e.g., solar-neighborhood) IMFs. The best-studied starburst galaxy with a large number of IXOs is NGC 253, and a detailed analysis of the temporal and spectral properties of its IXOs derived from Chandra, XMM-Newton, ASCA and ROSAT data will be discussed.
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