NOAO >   Observing Info >   Approved Programs >   2012A-0208

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Proposal Information for 2012A-0208


PI: Michael A. Strauss, Princeton University, strauss@astro.princeton.edu
Address: Astrophysical Sciences, Peyton Hall, Ivy Lane, Princeton, NJ 08544, USA

CoI: Jenny Greene, Princeton University
CoI: Rachael Alexandroff, Princeton University
CoI: Nadia Zakamska, Johns Hopkins University

Title: Rest-Frame Optical Spectra of High-Redshift Obscured Quasars

Abstract: We propose to obtain rest-frame optical spectra with GNIRS of a sample of 11 luminous high-redshift 1.5 < z < 3.4 obscured (Type II) quasar candidates. These objects, with estimated H-band magnitudes around 18.5 (Vega), have SDSS spectra characterized by weak continua and strong narrow (FWHM < 1000 km/s) emission lines of Ly(alpha), CIV 1549, He II 1640, and other high-ionization lines characteristic of quasars. GNIRS spectra of these objects will cover H(beta), [OIII] and H(alpha), allowing us to (a) look for a broad component to the Balmer lines; (b) measure the luminosity of [OIII], a proxy for the intrinsic bolometric luminosity of these objects; and (c) measure the continuum slope at rest-frame 5000\AA, constraining the stellar populations and stellar masses of the host galaxies. If we confirm that these objects are indeed obscured quasars, we will be able to determine the relative numbers of obscured and unobscured luminous quasars at redshifts corresponding to the peak of quasar activity.


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NOAO >   Observing Info >   Approved Programs >   2012A-0208

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