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The Relationship Between Black Hole Growth and Star Formation in Seyfert Galaxies | | Aleksandar M. Diamond-Stanic
; George H. Rieke
; | | Date: |
17 Jun 2011 | | Abstract: | We present estimates of black hole accretion rates and nuclear, extended, and
total star-formation rates for a complete sample of Seyfert galaxies. Using
data from the Spitzer Space Telescope, we measure the active galactic nucleus
(AGN) luminosity using the [O IV] 25.89 micron emission line and the
star-forming luminosity using the 11.3 micron aromatic feature and extended 24
micron continuum emission. We find that black hole growth is strongly
correlated with nuclear (r<1 kpc) star formation, but only weakly correlated
with extended star formation in the host galaxy. In particular, the nuclear
star-formation rate (SFR) traced by the 11.3 micron aromatic feature follows an
approximately linear relationship with the black hole accretion rate (BHAR),
with an observed scatter of 0.56 dex. This SFR-BHAR relationship persists,
although it becomes somewhat shallower, when additional star formation in
physically matched r=1 kpc apertures is included, but the relationship becomes
almost indiscernible when total SFRs are considered. This suggests a physical
connection between the gas on ~100 pc and sub-pc scales in local Seyfert
galaxies that is not related to external processes in the host galaxy. It also
suggests that the observed scaling between star formation and black hole growth
for samples of AGNs will depend on whether the star formation is dominated by a
nuclear or extended component. We estimate the integrated black hole and bulge
growth that occurs in these galaxies and find that an AGN duty cycle of 5-10%
would maintain the ratio between black hole and bulge masses seen in the local
universe. | | Source: | arXiv, 1106.3565 | | Services: | Forum | Review | PDF | Favorites | |
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