NIHAO XXI

The emergence of low surface brightness galaxies

Arianna Di Cintio, Chris B. Brook, Andrea Maccio, Aaron A. Dutton, Salvador Cardona-Barrero

    Research output: Contribution to journalArticle

    Abstract

    The existence of galaxies with a surface brightness μ lower than the night sky has been known since three decades. Yet, their formation mechanism and emergence within a Lambda cold dark matter universe has remained largely undetermined. For the first time, we investigated the origin of low surface brightness (LSB) galaxies with Mθ ∼ 109.5-10Mθ, which we are able to reproduce within hydrodynamical cosmological simulations from the NIHAO suite. The simulated and observed LSB galaxies share similar properties, having large HI reservoir, extended star formation histories and effective radii, lowSérsic index, and slowly rising rotation curves. The formation mechanism of these objects is explored: simulated LSB galaxies form as a result of coplanar co-rotating mergers and aligned accretion of gas at early times, while perpendicular mergers and misaligned gas accretion result in higher μ galaxies by z = 0. The larger the merger, the stronger the correlation between merger orbital configuration and final μ. While the halo spin parameter is consistently high in simulated LSB galaxies, the impact of halo concentration, feedback-driven gas outflows, and merger time only plays a minorto- no role in determining μ. Interestingly, the formation scenario of such 'classical' LSB galaxies differs from the one of less massive, Mθ ∼ 107-9Mθ, ultra-diffuse galaxies, the latter resulting from the effects of SNae-driven gas outflows: an Mθ of ∼109Mθ thus represents the transition regime between a feedback-dominated to an angular-momentum-dominated formation scenario in the LSB realm. Observational predictions are offered regarding spatially resolved star formation rates through LSB discs: these, together with upcoming surveys, can be used to verify the proposed emergence scenario of LSB galaxies.

    Original languageEnglish (US)
    Pages (from-to)2535-2548
    Number of pages14
    JournalMonthly Notices of the Royal Astronomical Society
    Volume486
    Issue number2
    DOIs
    StatePublished - Jun 1 2019

    Fingerprint

    brightness
    galaxies
    merger
    formation mechanism
    gases
    gas
    halos
    outflow
    accretion
    night sky
    star formation rate
    angular momentum
    star formation
    dark matter
    universe
    histories
    orbitals
    radii
    curves
    history

    Keywords

    • cosmology: theory.
    • dark matter
    • galaxies: evolution

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Di Cintio, A., Brook, C. B., Maccio, A., Dutton, A. A., & Cardona-Barrero, S. (2019). NIHAO XXI: The emergence of low surface brightness galaxies. Monthly Notices of the Royal Astronomical Society, 486(2), 2535-2548. https://doi.org/10.1093/mnras/stz985

    NIHAO XXI : The emergence of low surface brightness galaxies. / Di Cintio, Arianna; Brook, Chris B.; Maccio, Andrea; Dutton, Aaron A.; Cardona-Barrero, Salvador.

    In: Monthly Notices of the Royal Astronomical Society, Vol. 486, No. 2, 01.06.2019, p. 2535-2548.

    Research output: Contribution to journalArticle

    Di Cintio, A, Brook, CB, Maccio, A, Dutton, AA & Cardona-Barrero, S 2019, 'NIHAO XXI: The emergence of low surface brightness galaxies', Monthly Notices of the Royal Astronomical Society, vol. 486, no. 2, pp. 2535-2548. https://doi.org/10.1093/mnras/stz985
    Di Cintio A, Brook CB, Maccio A, Dutton AA, Cardona-Barrero S. NIHAO XXI: The emergence of low surface brightness galaxies. Monthly Notices of the Royal Astronomical Society. 2019 Jun 1;486(2):2535-2548. https://doi.org/10.1093/mnras/stz985
    Di Cintio, Arianna ; Brook, Chris B. ; Maccio, Andrea ; Dutton, Aaron A. ; Cardona-Barrero, Salvador. / NIHAO XXI : The emergence of low surface brightness galaxies. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 486, No. 2. pp. 2535-2548.
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