Mathematics – Probability
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21538305s&link_type=abstract
American Astronomical Society, AAS Meeting #215, #383.05; Bulletin of the American Astronomical Society, Vol. 42, p.598
Mathematics
Probability
Scientific paper
The co-evolution of galaxies and their central black holes via feedback mechanisms is still poorly understood. We use data from large surveys of the local Universe (SDSS & Galaxy Zoo) to show that the galaxy-black hole connection is fundamentally different in early- and late-type galaxies. Black hole accretion in early-type galaxies is proceeding at high Eddington ratios and occurs preferentially in the least massive part of the early-type galaxy populations. This black hole growth is associated with post-starburst host galaxies in the green valley whose progenitors experienced a merger 0.5 Gyr in the past. The black hole growth in late-type galaxies occurs in hosts with similar bulge masses, and therefore black hole masses as that in early-type galaxies. However, the black holes in late-type galaxies that are actively accreting are the most massive of the late-type parent population. Their substantially larger host galaxy masses (factor 10) are due to the presence of massive, stable stellar disks. The Milky Way is in many ways the prototype for a late-type galaxy whose black hole is feeding in the local Universe, and we estimate there is a 10% probability that a galaxy like the Milky Way has active accretion onto its central black hole. While we see that black hole growth in early-types is a post-starburst phenomenon, we do not have a clear picture of the role of AGN in late-type galaxies.
Cardamone Carie
Coppi Paolo
Galaxy Zoo Team
Lintott Chris
Ross Nicholas P.
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