NOAO >   Observing Info >   Approved Programs >   2012A-0314

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Proposal Information for 2012A-0314


PI: Allison Kirkpatrick, University of Massachusetts, kirkpatr@astro.umass.edu
Address: Department of Astronomy, University of Massachusetts, Lederle Graduate Research Tower B 619E, 710 North Pleasant Street, Amherst, MA 01003-9305, United States

CoI: Alexandra Pope, University of Massachusetts
CoI: Kristen Coppin, McGill University
CoI: David Alexander, Durham University
CoI: Mark Swinbank, Durham University
CoI: Karin Menendez-Delmestre, Carnegie Observatories

Title: Determining what drives outflows in high redshift galaxies

Abstract: The buildup of stellar mass in the Universe peaks from z 1-3, coinciding with the growth of black holes in the center of massive galaxies, pointing to an evolutionary link between the two. For a galaxy to evolve into a passive phase, star-formation (SF) must be terminated. One mechanism for quenching SF is large-scale outflows, which can be traced by [OIII] emission. Powerful outflows can be triggered by both active galactic nuclei (AGN) or supernovae winds corresponding with SF; it is difficult to distinguish between the two driving mechanisms at high-redshift. (U)LIRGs are the ideal population for studying outflows at high-redshift-they are luminous, abundant, and have both AGN and SF activity. We have a sample of (U)LIRGs in GOODS-N for which we have used Spitzer-IRS spectroscopy to determine if the mid-IR luminosity is powered by an AGN or SF. We propose to obtain rest-frame optical spectroscopy with GNIRS for 8 AGN and 7 SF sources with z=1-3.4 that are well-characterized by their full-IR SED. We will measure the flux and velocity dispersion of the [OIII] emission and look for a systematic difference among our SF and AGN sources providing insight as to the mechanism powering such outflows capable of extinguishing SF.


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