Computer Science – Graphics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21111104b&link_type=abstract
American Astronomical Society, AAS Meeting #211, #111.04; Bulletin of the American Astronomical Society, Vol. 39, p.940
Computer Science
Graphics
Scientific paper
One of the most prominent features in the evolution of galaxies since z 1 is the quenching of star formation which transforms blue galaxies into quiescent red systems and appears to build the red sequence. The mechanism that drives this evolution is not well known, but increasing attention has focused on the possibility that AGN feedback is responsible. Using Chandra X-ray observations in the All-wavelength Extended Groth Strip International Survey (AEGIS), we identify AGN host galaxies and compare the abundance of AGN hosts to the rate of star formation quenching observed in the total galaxy population. If the timescale for X-ray detectable AGN activity is roughly 0.5-1 Gyr--as suggested by black hole demographics and recent simulations--then we deduce that the inferred AGN "trigger" rate matches the star formation quenching rate, suggesting a link between these phenomena. However, given the large range of nuclear accretion rates we infer for the most massive and red hosts, X-ray selected AGNs may not be directly responsible for quenching star formation.
Bundy Kevin
Conselice Christopher J.
Cooper Martin C.
Ellis Richard S.
Faber Sandra M.
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