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We present photometric and spectroscopic observations of galaxies hostingType Ia supernovae (SNe Ia) observed by the Nearby Supernova Factory(SNfactory). Combining GALEX UV data with optical and near infrared photometry,we employ stellar population synthesis techniques to measure SN Ia host galaxystellar masses, star-formation rates (SFRs), and reddening due to dust. Wereinforce the key role of GALEX UV data in deriving accurate estimates ofgalaxy SFRs and dust extinction. Optical spectra of SN Ia host galaxies arefitted simultaneously for their stellar continua and emission lines fluxes,from which we derive high precision redshifts, gas-phase metallicities, andHalpha-based SFRs. With these data we show that SN Ia host galaxies presenttight agreement with the fiducial galaxy mass-metallicity relation from SDSSfor stellar masses log(M_*/M_Sun)>8.5 where the relation is well-defined. Thestar-formation activity of SN Ia host galaxies is consistent with a sample ofcomparable SDSS field galaxies, though this comparison is limited by systematicuncertainties in SFR measurements. Our analysis indicates that SN Ia hostgalaxies are, on average, typical representatives of normal field galaxies.

Host Galaxies of Type Ia Supernovae from the Nearby Supernova Factory