NOAO >   Observing Info >   Approved Programs >   2012B-0218

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Proposal Information for 2012B-0218


PI: Mariska Kriek, University of California, Berkeley, mkriek@berkeley.edu
Address: Astronomy Department, Hearst Field Annex, Berkeley, CA 97520, USA

CoI: Pieter van Dokkum, Yale University

Title: Resolved Kinematics of a Compact z=2.1 Quiescent Galaxy: Evidence for a Rotating Disk?

Abstract: Recent studies have shown that massive quiescent galaxies beyond z=2 are a factor of ~5 smaller than their local analogs. Using GNIRS we have confirmed these high stellar densities, and measured a velocity dispersion of ~500 km/s for a compact massive galaxy at z=2.2 (K_\rm AB=21.2). We propose to take these studies to the next level, and perform spatially-resolved spectroscopy of a compact bright (K_\rm AB=20.0) galaxy at z=2.1. This is now possible due to the availability of GNIRS in combination with the LGS-AO system and large-area photometry which allow the selection of a suitable bright target with a tip-tilt star. Using the 0.3" slit, the long camera, the 10 line/mm grating in cross-dispersed mode, and the LGS-AO system, we can determine whether this galaxy is supported by random motions or rotation, and measure a more accurate dynamical mass. In the process, we will obtain the highest quality spectrum of any non-star forming galaxy at z>2. The stellar kinematics of even a single galaxy will give us crucial clues to the origin of these compact quiescent systems.


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