The evolution of the gas fraction of quiescent galaxies modeled as a consequence of their creation rate

R. Gobat, G. Magdis, C. D'Eugenio, F. Valentino

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    Abstract

    We discuss the evolution of the interstellar medium of quiescent galaxies, currently emerging from recent analyses, with the help of a simple model based on well-established empirical relations such as the stellar mass functions and the main sequence of star formation. This model is meant to describe observed quantities without making specific assumptions on the nature of quenching processes, but relying on their observable consequences. We find that the high gas fractions seen or suggested at high redshift in quiescent galaxies, and their apparent mild evolution at early times, can be mostly attributed to a progenitor effect where recently quenched galaxies with ∼10% gas fractions dominate the quiescent galaxy population until z ∼ 1. In the same context, the much lower gas and dust fractions measured in local early-type galaxies are interpreted as the product of the steady depletion of their interstellar medium on a ∼2 Gyr timescale, coupled with a higher fraction of more gas-exhaustive events.
    Original languageEnglish
    Article numberL7
    JournalAstronomy and Astrophysics
    Volume644
    Number of pages7
    ISSN0004-6361
    DOIs
    Publication statusPublished - 2020

    Keywords

    • Galaxies: elliptical and lenticular, cD
    • Galaxies: formation
    • Galaxies: ISM

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