Extinction Priors for SNe Ia Host Galaxies and Their Effect on 'w'

Details Extinction Priors for SNe Ia Host Galaxies and Their Effect on 'w' Extinction Priors for SNe Ia Host Galaxies and Their Effect on 'w'

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21460410n&link_type=abstract

American Astronomical Society, AAS Meeting #214, #604.10

Astronomy and Astrophysics

Astronomy

Scientific paper

Uncertainty about the nature of dust in the host galaxies of type Ia supernovae (SNe Ia) is the largest source of systematic error affecting our understanding of the dark energy. Future high-redshift surveys, such as Pan-STARRS, will have incomplete spectroscopic coverage for typing transient objects. We will need to use photometry of the host galaxies to measure redshifts and understand the constraints that samples of supernovae from different host galaxy types have on the dark energy. To measure accurate luminosity distances to SNe Ia we must correct for absorption and reddening in the host galaxy. The reddening law for the environment around type Ia supernovae is not known but generally assumed to be a Milky Way reddening law parametrized by Rv = 3.1. Here we construct realistic Bayesian extinction priors on Av for different classes of galaxies from measurements of nearby type Ia supernovae in the CfA3 SN sample. This approach accounts for the different extinction properties of early and late type galaxies and ensures that distance estimates for distant supernovae are not affected by the changing fraction of early to late type galaxies with redshift. We use Monte-Carlo simulations to study the effect of SNe Ia "impostors" in different galaxy types on the equation of state of the dark energy, 'w'. We measure the effect of different extinction priors and reddening laws on 'w' and analyze the effect of using an incorrect extinction prior.

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