Physics – Optics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21538306a&link_type=abstract
American Astronomical Society, AAS Meeting #215, #383.06; Bulletin of the American Astronomical Society, Vol. 42, p.598
Physics
Optics
Scientific paper
It is thought that the immense energies associated with accretion of matter onto black holes in AGN and QSOs may "feedback," via intense photon flux or outward motion of gas, and affect certain properties of the host galaxy. In particular, AGN feedback may contribute to quenching of star formation by the expulsion or heating of cold gas, causing the host galaxy to evolve 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 60 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, HST NICMOS, and newly public Wide Field Camera 3 imaging, I test for evidence of quenching on sub-kiloparsec scales, independent of dust extinction. Correlations between near-ultraviolet /optical (NUV - R) colors and gradients and X-ray parameters such as hardness ratio and luminosity reveals new information about the nature of AGN-driven feedback. There is little (< 0.3 mags) difference between the NUV - R gradients of the obscured, hard sources and the unobscured, soft sources, suggesting that the unobscured sources are not increasingly quenched of star formation, a prediction of several bright-mode models. I compare the NUV - R colors of spiral galaxies that host AGN to non-active spirals of comparable stellar mass, finding similar color gradients, but redder colors. This suggests that the AGN is associated with a uniform reddening of the stellar population, and not a centralized quenching. Taken together, these observations are consistent with pictures invoking strangulation, halo-quenching, or radio-mode AGN feedback to explain the formation of red, massive galaxies today.
Ammons Stephen
Dutton Aaron A.
Koo David
Max Claire
Rosario J. V. D.
No associations
LandOfFree
The Role Of Agn In Quenching Of Massive Galaxies At Z 1 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Role Of Agn In Quenching Of Massive Galaxies At Z 1, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Role Of Agn In Quenching Of Massive Galaxies At Z 1 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-964277