Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21830102g&link_type=abstract
American Astronomical Society, AAS Meeting #218, #301.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
While the term AGN generally refers to nuclear luminosities exceeding a few per cent of the Eddington-limit, the distinction between active and inactive is ultimately set by our ability to detect and interpret signatures of accretion-powered activity. The aim of the AMUSE surveys is to effectively bridge the gap between AGN and formally inactive galaxies. This is accomplished through snapshot Chandra observations of two distance limited samples of early type galaxies: 100 within the Virgo cluster (AMUSE-Virgo), plus 100 field galaxies (AMUSE-Field). The two samples are unbiased with respect to nuclear properties and span over three order of magnitude in host stellar mass, enabling us to investigate accretion-powered activity from local super-massive black holes, and its possible dependence on the environments, down to the Eddington luminosity for a 10 solar mass object. While, at face value, the active fraction for the Virgo sample increases with host stellar mass, we find evidence for a `down-sizing' effect, that is, low-mass black holes emit relatively closer to their Eddington limit than higher mass objects. A similar trend is now apparent for the field sample, albeit with higher detection rates. During this talk, I will present and compare the latest results from the two surveys, and briefly discuss them in the context of environmental effects.
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