NOAO >   Observing Info >   Approved Programs >   2012B-0170

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Proposal Information for 2012B-0170


PI: Guilin Liu, Johns Hopkins University, liu@pha.jhu.edu
Address: Physics Department, Bloomberg Center, Charles and 34th Street, Baltimore, MD 21218, USA

CoI: Nadia L. Zakamska, Johns Hopkins University
CoI: Jenny E. Greene, Princeton University

Title: Feedback in Unobscured vs. Obscured Quasars

Abstract: The correlations between properties of supermassive black holes and stellar spheroids in galaxies imply a physical connection between these two components in spite of their vastly different masses and physical scales. Radio-loud active galactic nuclei exert a strong feedback on their host galaxies, providing a possible physical mechanism. However, only a minority of active galaxies are radio-loud. Our previous Gemini observations strongly suggest that luminous type 2 (obscured) radio- quiet quasars can drive gas outflows similar to those driven by powerful radio galaxies. We propose a GMOS IFU survey of the ionized gas nebulae in twelve type 1 (unobscured) radio-quiet quasars with luminosities and redshifts matched to the observed type 2 sample. By comparing the energetics in the nebulosities of the two populations, we will learn whether type 1 quasars also drive large-scale winds observable in ~ 10^4 K gas. If the nebulae are different or non-existent, we will obtain direct evidence of evolutionary differences between type 1 and 2 quasars. Once completed, these observations will provide an definitive investigation of the ionized gas outflows initiated by radio-quiet quasars and a strong test of the evolutionary scenario predicted by theoretical models.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2012B-0170

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