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18 April 2024 |
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AEGIS: New Evidence Linking Active Galactic Nuclei to the Quenching of Star Formation | | Kevin Bundy
; Antonis Georgakakis
; Kirpal Nandra
; Richard S. Ellis
; Christopher J. Conselice
; Elise Laird
; Alison Coil
; Michael Cooper
; Sandra M. Faber
; Jeff A. Newman
; Christy M. Pierce
; Joel R. Primack
; Renbin Yan
; | | Date: |
10 Oct 2007 | | Abstract: | Utilizing Chandra X-ray observations in the All-wavelength Extended Groth
Strip International Survey (AEGIS) we identify 241 X-ray selected Active
Galactic Nuclei (AGNs, L > 10^{42} ergs/s) and study the properties of their
host galaxies in the range 0.4 < z < 1.4. By making use of infrared photometry
from Palomar Observatory and BRI imaging from the Canada-France-Hawaii
Telescope, we estimate AGN host galaxy stellar masses and show that both
stellar mass and photometric redshift estimates (where necessary) are robust to
the possible contamination from AGNs in our X-ray selected sample. Accounting
for the photometric and X-ray sensitivity limits of the survey, we construct
the stellar mass function of X-ray selected AGN host galaxies and find that
their abundance decreases by a factor of ~2 since z~1, but remains roughly flat
as a function of stellar mass. We 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. | | Source: | arXiv, 0710.2105 | | Services: | Forum | Review | PDF | Favorites | |
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