Evolution of Dust Extinction and Supernova Cosmology

Details Evolution of Dust Extinction and Supernova Cosmology Evolution of Dust Extinction and Supernova Cosmology

1999-10-04

arxiv.org/abs/astro-ph/9910038v1

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures. Accepted by ApJ Letters

Scientific paper

10.1086/312377

We have made a quantitative calculation for the systematic evolution of average extinction by interstellar dust in host galaxies of high-redshift Type Ia supernovae, by using a realistic model of photometric and chemical evolution of galaxies and supernova rate histories in various galaxy types. We find that average B band extinction at z \sim 0.5 is typically 0.1-0.2 mag larger than present, under a natural assumption that dust optical depth is proportional to gas column density and gas metallicity. This systematic evolution causes average reddening with E(B-V) \sim 0.025-0.05 mag with the standard extinction curve, and this is comparable with the observational uncertainty of the reddening of high-redshift supernovae. Therefore, our result does not contradict the observations showing no significant reddening in high-z supernovae. However, the difference in apparent magnitude between an open universe and a \Lambda-dominated flat universe is only \sim 0.2 mag at z \sim 0.5, and hence this systematic evolution of extinction should be taken into account in a reliable measurement of cosmological parameters. Considering this uncertainty, we show that it is difficult to discriminate between an open and \Lambda-dominated flat cosmologies from the current data.

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