NOAO >   Observing Info >   Approved Programs >   2002A-0363

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Proposal Information for 2002A-0363


PI: Ive Kohnenkamp, University of Arizona, ikohnenkamp@as.arizona.edu
Address: 933 N Cherry Ave, Tucson, AZ 85721-6605, USA

CoI: Richard Green, NOAO

Title: Evolution of Black Hole Mass for given Luminosities as a Function of Cosmic Time

Abstract: We propose to use the wide spectral coverage of the new instrument MARS on the 4m telescope to carry out spectrophotometry for five samples of QSOs on the redshift range 0.6 < z < 4.2 and luminosities in three ranges. The spectra will be used to calculate the mass of the black hole using an empirical method based on the photoionization method as described in the proposal and calibrated on a local sample of AGNs with HST spectra and reverberation masses. The lines to be targeted are H(beta), MgII (lambda) 2799 and CIII] (lambda) 1909. MARS with its high sensitivity, lack of fringing and ability to cancel night sky emission will allow us to measure lines in quasar spectra that were not before accessible. In all samples except the one at highest redshift, two of the lines will be captured on each spectrum, to allow a consistency check. The scientific goal of the investigation is to statistically assess the evolution of black hole mass for given luminosities as a function of cosmic time.


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



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