NOAO >   Observing Info >   Approved Programs >   2006A-0490

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Proposal Information for 2006A-0490


PI: Fred Hamann, University of Florida, hamann@astro.ufl.edu
Address: Astronomy Department, 211 Bryant Space Science Center, Gainesville, FL 32611-2055, USA

Title: Quasars and Their Host Galaxies at High Redshifts

Abstract: Recent studies indicate that more massive supermassive black holes (SMBHs) reside in more massive host galaxies (bulges). There is also a well-established positive correlation between galaxy mass and galaxy metallicity. However, both of these relationships have so far been studied only at low redshifts. To examine these relationships at high redshifts and make comparisons across cosmic time, we propose spectroscopic emission-line observations of AGNs at both low (z \lesssim 0.5) and high (z \gtrsim 1.8) redshifts that have \it published imaging data of their host galaxies. Our observations will test the hypothesis that the gas-phase metallicities near AGNs also scale with host galaxy mass by making the first direct comparison between these two quantities. We will also examine the M_BH versus M_bulge relationship, and compare critical AGN properties (such as SMBH mass, metallicity, and the accretion diagnostic L/L_edd) to host luminosity/mass, over \gtrsim7 years of cosmic time - thus providing key constraints on coupled AGN-galaxy evolution. Finally, we will compare the SMBH masses derived from the H(beta) and \ionC4 (lambda)1549 emission lines, and compare both the the host galaxy luminosities, to calibrate the use of \ionC4 as a mass diagnostic at high-z.


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 >   2006A-0490

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