Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21332904w&link_type=abstract
American Astronomical Society, AAS Meeting #213, #329.04; Bulletin of the American Astronomical Society, Vol. 41, p.386
Astronomy and Astrophysics
Astronomy
Scientific paper
Super-massive black holes (SMBHs) are believed to be present in the centers of essentially all galaxies with masses greater than the Milky Way. However, most of these SMBHs are hardly active at present, apparently due to the lack of sufficient amounts of gas for them to accrete. To understand the reason for this apparent starvation, we are carrying out a multi-wavelength study of nearby galactic bulges, especially their nuclear regions. This presentation will focus on M31 and NGC 5866, which show little AGN and star-forming activities in their bulge regions. We characterize the content, morphology, and physical state of various gas phases to explore their heating, transportation, and cooling as well as their origin and fate. We find that the Type Ia supernova heating likely plays an essential role in regulating the nuclear environment of these galaxies. In particular, our results suggest that cool gas, which originate from the stellar mass-loss of evolved stars and from outer regions, is being mass-loaded into the hot gas that is escaping from the galactic bulges, resulting the starvation of the SMBHs.
Li Jiying
Li Zaidong
Tang Shanjian
Wakker Bart
Wang Daniel Q.
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