Physics – Optics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21430303a&link_type=abstract
American Astronomical Society, AAS Meeting #214, #303.03; Bulletin of the American Astronomical Society, Vol. 41, p.719
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 HST ACS imaging 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. The hosts display mean gradients in rest-frame NUV-R, suggesting nonuniform stellar age mixtures. There is 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 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 that a condition of fueling is a large gas reservoir. On larger spatial scales I incorporate deep VLT ISSAC JHK imaging and confirm these results on a larger sample of 60 AGN. Our observations support the notions that cold gas is distributed in these sources and unobscured AGN are not increasingly quenched of star formation relative to obscured sources.
Future adaptive optics instrumentation may deliver the spatial resolution required to resolve circumnuclear starbursting in AGN and faint hosts of bright QSOs beyond z 1. Toward this end, we have used a laboratory mock-up of a 10-meter telescope to demonstrate diffraction-limited imaging with laser guide stars at visible wavelengths (550 nm). This laser tomographic AO system maintains 20-25% Strehl over a 30” field in V-band. These experiments lend credence to development of high-order AO instrumentation on 8-10 meter telescopes.
Ammons Stephen
Dutton Aaron A.
Koo David
Max Claire
Melbourne Jason
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