Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21331303c&link_type=abstract
American Astronomical Society, AAS Meeting #213, #313.03; Bulletin of the American Astronomical Society, Vol. 41, p.290
Astronomy and Astrophysics
Astronomy
Scientific paper
Because structure in the Universe is built up through galaxy mergers and nearly all galaxies host a central supermassive black hole (SMBH), some galaxies should possess two SMBHs near their centers as the result of a recent merger. These SMBHs spiral to the center of the resultant merger-remnant galaxy, and one or both of the SMBHs may
power an active galactic nucleus (AGN). Using the DEEP2 Galaxy Redshift Survey we have identified 37 AGN with velocities significantly different from their host galaxy's stars, a sign that those galaxies may recently have undergone mergers. With this new technique of identifying mergers, we find that roughly half of early-type galaxies hosting AGN are also merger remnants. This result implies that mergers may trigger AGN activity in early-type galaxies and sets a merger rate of 3 mergers/Gyr for early-type galaxies at redshifts 0.34 < z < 0.82.
This work is supported by NSF grant AST-0507428.
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