NOAO >   Observing Info >   Approved Programs >   2016A-0077

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Program Information for 2016A-0077


PI: Fred Hamann, U. of Florida, fhamann@ufl.edu
Address: Department of Astronomy, PO Box 112055, 211 Bryant Space Science Center, Gainesville, FL, 32611-2055 USA

CoI: Chen Chen, U. of Florida
CoI: Leah Simon, Ripon College

Title: Feedback vs Cold Mode Accretion: Accurate Velocities for Complex Infall/Outflow Gas Near Redshift 3 Quasars

Abstract: Massive galaxy formation is believed to occur rapidly at high redshifts, truncated by powerful winds (feedback) that can shred and disperse ISM clouds, disrupt star formation, and reveal the visibly luminous quasars in galactic nuclei. Gaseous infall from the IGM (e.g., cold mode accretion) is also expected to be important during these early active stages of quasar/host galaxy evolution, but no direct evidence for this infall presently exists. We obtained high-resolution rest-UV spectra of three redshift ~3 quasars with unusually rich complexes of CIV absorption lines that appear to have both infall and outflow occurring across total velocity spans >3000 km/s. The absorption line data will provide important information on the metallicities and physical properties of the gas to test physical models of galaxy/quasar evolution. However, we cannot address the most basic questions about the gas speeds, kinetic energies, and infall versus outflow without accurate systemic redshifts. We propose 1.7 hrs with Gemini-N GNIRS to resolve this long-standing problem by measuring accurate quasar redshifts from the [OIII] emission lines in the observed-frame K band.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2016A):  GEM-NQ/GNIRS -- 1.7hrs band 1 (GN-2016A-Q-25)


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 >   2016A-0077

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