NOAO >   Observing Info >   Approved Programs >   2009A-0182

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Proposal Information for 2009A-0182


PI: Greg Aldering, Lawrence Berkeley Lab, galdering@lbl.gov
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 observe a sample of host galaxies of Type Ia supernovae using the R-C spectrograph on the CTIO 4m in order to obtain high-precision redshift measurements as well as information about the nature of supernova environments. The Nearby Supernova Factory (SNfactory) is working to anchor the low redshift end of the SN Ia Hubble diagram in the nearby smooth Hubble flow with observations of a large number of SNe Ia. The SNfactory uses an impartial search technique, and thus finds many SNe Ia in galaxies which have previously unknown redshifts. Progenitor age and metallicity are predicted to have significant impact on SN Ia properties, making it important to examine the environments of a well-studied sample of SNe Ia to investigate these 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



NOAO >   Observing Info >   Approved Programs >   2009A-0182

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