Physics – Optics
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21334201a&link_type=abstract
American Astronomical Society, AAS Meeting #213, #342.01; Bulletin of the American Astronomical Society, Vol. 41, p.476
Physics
Optics
Scientific paper
AGN feedback may contribute to quenching of star formation and evolution of galaxies onto the red sequence (e.g., Di Matteo et al. 2005, Hopkins et al. 2006). I probe for the effects of feedback on the stellar populations of 25 X-ray selected AGN hosts at z 1 in the GOODS-South field. Combining high spatial resolution optical imaging from HST ACS, and high spatial resolution near infrared data from Keck Laser Guide Star Adaptive Optics and HST NICMOS, I test for the presence of young stars on sub-kiloparsec scales, independent of dust extinction. I detect mean gradients in rest-frame NUV-R to 400 pc, suggesting nonuniform stellar age mixtures. I observe little (< 0.05 mags) difference between the NUV-R gradients of the obscured sources and the unobscured sources, suggesting that the unobscured sources are not increasingly quenched of star formation. SED fitting of optical to IR colors at all radii reveals a correlation between the mass fraction of young (< 100 Myr) stars and AGN strength (as measured with [OIII] line luminosity), suggesting common conditions for star formation and black hole fueling. On larger spatial scales I incorporate deep VLT ISSAC JHK imaging and confirm these results on a larger sample of 60 AGN. In contrast to local AGN, evidence from mid-IR colors suggests that the obscuration in Type II AGN at high redshift is due to kpc-scale dusty features rather than a small-scale dust torus. Our observations support the notions that (1) the obscuration in Type II AGN at z 1 may be due to kpc-scale dusty features, (2) cold gas is distributed in these sources, and (3) unobscured AGN do not appear to be increasingly quenched of star formation relative to obscured sources, although they lack cold dust.
Ammons Stephen
Dutton Aaron A.
Koo David C.
Max Claire Ellen
Melbourne Jason
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