Interaction between dark matter sub-halos and a galactic gaseous disk

Rahul Kannan, Andrea Maccio, Anna Pasquali, Benjamin P. Moster, Fabian Walter

    Research output: Contribution to journalArticle

    Abstract

    We investigate the idea that the interaction of dark matter (DM) sub-halos with the gaseous disks of galaxies can be the origin for the observed holes and shells found in their neutral hydrogen (H I) distributions. We use high-resolution hydrodynamic simulations to show that pure DM sub-halos impacting a galactic disk are not able to produce holes; on the contrary, they result in high-density regions in the disk. However, sub-halos containing a small amount of gas (a few percent of the total DM mass of the sub-halo) are able to displace the gas in the disk and form holes and shells. The sizes and lifetimes of these holes depend on the sub-halo gas mass, density, and impact velocity. A DM sub-halo, of mass 108 M and a gas mass fraction of 3%, is able to create a kiloparsec-scale hole with a lifetime similar to those observed in nearby galaxies. We also register an increase in the star formation rate at the rim of the hole, again in agreement with observations. Even though the properties of these simulated structures resemble those found in observations, we find that the number of predicted holes (based on mass and orbital distributions of DM halos derived from cosmological N-body simulations) falls short compared to the observations. Only a handful of holes are produced per gigayear. This leads us to conclude that DM halo impact is not the major channel through which these holes are formed.

    Original languageEnglish (US)
    Article number10
    JournalAstrophysical Journal
    Volume746
    Issue number1
    DOIs
    StatePublished - Feb 10 2012

    Fingerprint

    halos
    dark matter
    interactions
    gas
    shell
    gases
    galaxies
    simulation
    life (durability)
    impact velocity
    hydrodynamics
    registers
    hydrogen
    star formation rate
    rims
    mass distribution
    orbitals
    high resolution
    distribution

    Keywords

    • dark matter
    • galaxies: structure
    • ISM: bubbles
    • ISM: structure

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics
    • Nuclear and High Energy Physics

    Cite this

    Kannan, R., Maccio, A., Pasquali, A., Moster, B. P., & Walter, F. (2012). Interaction between dark matter sub-halos and a galactic gaseous disk. Astrophysical Journal, 746(1), [10]. https://doi.org/10.1088/0004-637X/746/1/10

    Interaction between dark matter sub-halos and a galactic gaseous disk. / Kannan, Rahul; Maccio, Andrea; Pasquali, Anna; Moster, Benjamin P.; Walter, Fabian.

    In: Astrophysical Journal, Vol. 746, No. 1, 10, 10.02.2012.

    Research output: Contribution to journalArticle

    Kannan, R, Maccio, A, Pasquali, A, Moster, BP & Walter, F 2012, 'Interaction between dark matter sub-halos and a galactic gaseous disk', Astrophysical Journal, vol. 746, no. 1, 10. https://doi.org/10.1088/0004-637X/746/1/10
    Kannan, Rahul ; Maccio, Andrea ; Pasquali, Anna ; Moster, Benjamin P. ; Walter, Fabian. / Interaction between dark matter sub-halos and a galactic gaseous disk. In: Astrophysical Journal. 2012 ; Vol. 746, No. 1.
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