NOAO >   Observing Info >   Approved Programs >   2010B-0599

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Proposal Information for 2010B-0599


PI: Kurt Soto, University of Califonia, Santa Barbara, ktsoto@physics.ucsb.edu
Address: Physics Department, University of California, Santa Barbara, CA 93106-9530, USA

CoI: Crystal L. Martin, University of California, Santa Barbara

Title: Integral Field Spectroscopy of Ultra Luminous Infrared Galaxies

Abstract: In a recent analysis of Balmer absorption lines in Ultra Luminous Galaxies, we discovered an increasing gradient in equivalent width out to 10 kpc. This measurement indicates that star formation was quenched from the outside inward, which is contrary to the formation of disks in isolated galaxies. We attribute this gradient in ULIRGS to tidally driven gas inflow and use the age measurements to constrain the inflow rate. By measuring this inflow we can better understand the morphological progression of gas rich disk mergers to elliptical galaxies, since the resulting starburst is necessary to increase the phase-space density. With 9 hours of observing time on the GMOS IFU in "two slit" mode, we will be able to create a 70 arcsec^2 map of Balmer absorption and D4000. This mapping will better constrain the time since star formation was quenched, and fully investigate the radial dependence of the star formation history. In this test project we will examine IRAS23365+3604, but extend the project to the full sample of 43 ULIRGs for which we have longslit data in future semesters.


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NOAO >   Observing Info >   Approved Programs >   2010B-0599

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