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Related Experiment Videos

Simulating the Effects of Intergalactic Gray Dust.

Croft, Davé, Hernquist

    The Astrophysical Journal
    |May 17, 2000
    PubMed
    Summary

    Intergalactic gray dust extinction can be constrained using Type Ia supernovae. Smoothly distributed dust, tracing gas, aligns with observations, while metal-tracing dust does not.

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    Area of Science:

    • Cosmology
    • Astrophysics
    • Dust Extinction

    Background:

    • Type Ia supernovae are crucial cosmic distance indicators.
    • Intergalactic dust can affect the observed brightness of distant supernovae.
    • Previous studies have noted discrepancies in supernova magnitude data.

    Purpose of the Study:

    • To develop a method for constraining intergalactic gray dust extinction.
    • To compare simulation-based dust extinction with observed supernova magnitudes.
    • To investigate the spatial distribution of intergalactic dust.

    Main Methods:

    • Utilizing a high-resolution cosmological hydrodynamic simulation.
    • Relating intergalactic dust density to gas density using simple prescriptions.
    • Analyzing the observed magnitudes of distant Type Ia supernovae (Perlmutter et al.).

    Main Results:

    • Dust extinction is sensitive to spatial distribution, not intrinsic properties.
    • Smoothly distributed dust, tracing intergalactic gas, is consistent with supernova data.
    • Dust distributions tracing metal density are inconsistent at 1.5-2 sigma.

    Conclusions:

    • Constraining intergalactic gray dust requires understanding its spatial distribution.
    • Future observations and improved dust modeling will refine constraints.
    • The study provides a framework for using supernovae to probe intergalactic dust.

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