NOAO >   Observing Info >   Approved Programs >   2009B-0060

Small NOAO Logo

Proposal Information for 2009B-0060


PI: Dr. Sean M. Moran, Johns Hopkins University, moran@pha.jhu.edu
Address: Dept. of Physics and Astronomy, 3400 N Charles St, Baltimore, MD 21218

CoI: Timothy Heckman, Johns Hopkins University
CoI: Barbara Catinella, MPA-Garching, Germany
CoI: David Schiminovich, Columbia University
CoI: Guinevere Kauffmann, MPA-Garching, Germany

Title: A Comprehensive Picture of Star Formation, HI Content, and Dynamics for Galaxies Across the Blue to Red Transition: Resolved Spectroscopy of Galaxies in GASS, the GALEX-Arecibo-SDSS Survey

Abstract: We propose to acquire longslit spectroscopy of galaxies in GASS, an Arecibo HI survey aiming to measure the gas content of a volume-limited sample of 1000 galaxies in the range 0.025<z<0.05. The GASS sample spans the critical `transition' mass separating star forming galaxies from passive red sequence galaxies. But existing SDSS fiber spectra cover only the central few kpc of galaxies at these redshifts, and so provide no insight into the current and recent star formation histories of outer disks, where most star formation and most of the gas resides. In order to make progress in relating these galaxies' recent star formation histories and internal dynamics to their total HI content, resolved longslit spectroscopy covering the full radial extent of each galaxy is critical. We therefore propose to extend our program using the MMT blue channel spectrograph, begun in 2008B, to acquire such spectra of additional targets from the fainter end of the GASS sample. When combined with observations of brighter targets from our ongoing program with the 3.5m at Apache Point, NM, we aim to obtain this essential resolved information for a significant fraction of the GASS sample.


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 >   2009B-0060

noaoprop-help@noao.edu

Small NOAO Logo