PI: Greg Aldering, Lawrence Berkeley Lab, firstname.lastname@example.org
Address: Physics Department, 1 Cyclotron Rd. 50R-5032, Berkeley, CA, USA
CoI: Michael Childress, UC Berkeley / LBL
CoI: Rollin C. Thomas, Lawrence Berkeley Lab
CoI: Saul Perlmutter, UC Berkeley / LBL
Title: Host Galaxies of Hubble Flow Type Ia Supernovae
Abstract: We propose to obtain spectroscopy for a unique sample of Type Ia supernova host galaxies using the SOAR 4m in order to measure high- precision redshifts and study the nature of supernova environments. The Nearby Supernova Factory has conducted by far the largest (~400 SNe Ia over 20,000 sq deg out to z~0.012) impartial survey, and the only extensive spectrophotometric time series follow-up, of SNe Ia in the nearby Hubble flow. SOAR spectroscopy for the resulting anonymous host galaxies will be used to measure the precise redshifts needed for cosmology and determination of SN photospheric velocities. Emission or absorption lines measured from host galaxy spectra can provide valuable information on metallicity, star-formation, and dust content. As age and metallicity are predicted to have significant impact on SN Ia properties, it is important to examine the environments of such a large unbiased sample of SNe Ia to investigate such effects. Redshifts from host galaxy spectra will facilitate the construction of the most accurate Hubble diagram to date, while the spectra themselves will allow us to probe the environments of the SNe in our sample.
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360