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R.S. Ellis (Caltech), M. Sullivan (Durham), G. Aldering (LBNL), R. Amanullah (Stockholm), P. Antilogus (IPN Lyon), P. Astier (LPNHE), C. Balland (IAS Orsay), G. Blanc (LBNL), M.S. Burns (Colorado Col.), A. Conley, S. Deustua (LBNL), S. Fabbro (IPN Lyon), G. Folatelli (Stockholm), A. Fruchter (STScI), G. Garavini (Stockholm), R. Gibbons, G. Goldhaber (LBNL), A. Goobar (Stockholm), D.E. Groom (LBNL), D. Hardin (LPNHE), I.M. Hook (Oxford), D.A. Howell (LBNL), M. Irwin (IoA Cambridge), D. Kasen, A. Kim (LBNL), R.A. Knop (Vanderbilt), J.-M. Levy (LPNHE), C. Lidman (ESO), R. McMahon (IoA Cambridge), M. Mouchet (DAEC Meudon), S. Nobili (Stockholm), P. Nugent (LBNL), R. Pain (LPNHE), N. Panagia (STScI), E. Pécontal (CRA Lyon), C.R. Pennypacker, S. Perlmutter, R. Quimby (LBNL), J. Raux (LPNHE), N. Regnault (LBNL), P. Ruiz-Lapuente (Barcelona), B. Schaefer (Texas), K. Schahmaneche (LPNHE), A.L. Spadafora (LBNL), N. Walton (ING LaPalma), L. Wang, W.M. Wood-Vasey (LBNL), Supernova Cosmology Project Collaboration
We review the results of an extensive survey which aims to characterize those galaxies which hosted Type Ia supernovae found by the Supernova Cosmology Project (SCP). Using Hubble Space Telescope images and intermediate dispersion Keck spectroscopy, we have classified each host galaxy into three morphological/spectral types in order to investigate the dependence of distant supernova properties with respect to the host galaxy class. Of particular interest is the subset of Type Ia supernovae hosted by spheroidal galaxies, which are expected to be dust-free and more tightly scattered about the Hubble diagram. The best-fit cosmology for this ``clean" subset agrees well with that previously measured by the SCP. The SN Ia subset in late-type irregulars also yields consistent results, with the expected larger scatter. Further spectroscopic programs at the Keck observatory will characterize the progenitor metallicity of selected high redshift supernovae for comparison with local data. This work was supported in part by the NASA Space Telescope Science Institute.