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Related Experiment Videos

Evolution of Dust Extinction and Supernova Cosmology.

Totani, Kobayashi

    The Astrophysical Journal
    |November 7, 1999
    PubMed
    Summary

    Interstellar dust extinction in high-redshift galaxies is systematically higher, impacting Type Ia supernova measurements. This dust evolution is crucial for accurate cosmological parameter determination.

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    Area of Science:

    • Cosmic Dust Studies
    • Galactic Evolution
    • Supernova Cosmology

    Background:

    • Understanding dust extinction in high-redshift galaxies is crucial for interpreting Type Ia supernova data.
    • Previous studies have not fully accounted for the systematic evolution of interstellar dust.

    Purpose of the Study:

    • To quantitatively calculate the systematic evolution of average extinction by interstellar dust in host galaxies of high-redshift Type Ia supernovae.
    • To assess the impact of dust evolution on cosmological parameter measurements.

    Main Methods:

    • Utilized a realistic model of photometric and chemical evolution of galaxies.
    • Incorporated supernova rate histories in various galaxy types.
    • Assumed dust optical depth is proportional to gas column density and metallicity.

    Main Results:

    • Average B-band extinction at z ~ 0.5 is predicted to be 0.1-0.2 mag higher than at present.
    • This evolution causes an average reddening of E(B-V) ~ 0.025-0.05 mag.
    • The predicted reddening is comparable to observational uncertainties for high-redshift supernovae.

    Conclusions:

    • The study's findings do not contradict current observations of minimal reddening in high-redshift supernovae.
    • Systematic dust evolution must be considered for reliable cosmological parameter measurements.
    • Distinguishing between open and Lambda-dominated flat cosmologies is challenging with current data due to dust extinction uncertainties.

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