NIHAO V

Too big does not fail-reconciling the conflict between ΛCDM predictions and the circular velocities of nearby field galaxies

Aaron A. Dutton, Andrea Maccio, Jonas Frings, Liang Wang, Gregory S. Stinson, Camilla Penzo, Xi Kang

    Research output: Contribution to journalArticle

    Abstract

    We compare the half-light circular velocities, V1/2, of dwarf galaxies in the Local Group to the predicted circular velocity curves of galaxies in the Numerical Investigations of Hundred Astrophysical Objects (NIHAO) suite of Λ cold dark matter (ΛCDM) simulations. We use a subset of 34 simulations in which the central galaxy has a stellar luminosity in the range 0.5×105 <LV/L⊙ <2×108. The NIHAOgalaxy simulations reproduce the relation between stellar mass and halo mass from abundance matching, as well as the observed half-light size versus luminosity relation. The corresponding dissipationless simulations overpredict the V1/2, recovering the problem known as too big to fail (TBTF). By contrast, the NIHAO simulations have expanded dark matter haloes, and provide an excellent match to the distribution of V1/2 for galaxies with LV ≥ 2 × 106 L⊙. For lower luminosities, our simulations predict very little halo response, and tend to overpredict the observed circular velocities. In the context of ΛCDM, this could signal the increased stochasticity of star formation in haloes below Mhalo ~ 1010M⊙, or the role of environmental effects. Thus, haloes that are 'TBTF', do not fail ΛCDM, but haloes that are 'too small to pass' (the galaxy formation threshold) provide a future test of ΛCDM.

    Original languageEnglish (US)
    Pages (from-to)L74-L78
    JournalMonthly Notices of the Royal Astronomical Society: Letters
    Volume457
    Issue number1
    DOIs
    StatePublished - Jan 7 2016

    Fingerprint

    halos
    dark matter
    astrophysics
    galaxies
    prediction
    predictions
    simulation
    luminosity
    stellar luminosity
    galactic evolution
    dwarf galaxies
    stochasticity
    stellar mass
    environmental effect
    set theory
    cold
    conflict
    star formation
    thresholds
    curves

    Keywords

    • Cosmology: theory
    • Dark matter
    • Galaxies: dwarf
    • Galaxies: haloes
    • Galaxies: kinematics and dynamics
    • Local group

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    NIHAO V : Too big does not fail-reconciling the conflict between ΛCDM predictions and the circular velocities of nearby field galaxies. / Dutton, Aaron A.; Maccio, Andrea; Frings, Jonas; Wang, Liang; Stinson, Gregory S.; Penzo, Camilla; Kang, Xi.

    In: Monthly Notices of the Royal Astronomical Society: Letters, Vol. 457, No. 1, 07.01.2016, p. L74-L78.

    Research output: Contribution to journalArticle

    Dutton, Aaron A. ; Maccio, Andrea ; Frings, Jonas ; Wang, Liang ; Stinson, Gregory S. ; Penzo, Camilla ; Kang, Xi. / NIHAO V : Too big does not fail-reconciling the conflict between ΛCDM predictions and the circular velocities of nearby field galaxies. In: Monthly Notices of the Royal Astronomical Society: Letters. 2016 ; Vol. 457, No. 1. pp. L74-L78.
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    abstract = "We compare the half-light circular velocities, V1/2, of dwarf galaxies in the Local Group to the predicted circular velocity curves of galaxies in the Numerical Investigations of Hundred Astrophysical Objects (NIHAO) suite of Λ cold dark matter (ΛCDM) simulations. We use a subset of 34 simulations in which the central galaxy has a stellar luminosity in the range 0.5×105 <LV/L⊙ <2×108. The NIHAOgalaxy simulations reproduce the relation between stellar mass and halo mass from abundance matching, as well as the observed half-light size versus luminosity relation. The corresponding dissipationless simulations overpredict the V1/2, recovering the problem known as too big to fail (TBTF). By contrast, the NIHAO simulations have expanded dark matter haloes, and provide an excellent match to the distribution of V1/2 for galaxies with LV ≥ 2 × 106 L⊙. For lower luminosities, our simulations predict very little halo response, and tend to overpredict the observed circular velocities. In the context of ΛCDM, this could signal the increased stochasticity of star formation in haloes below Mhalo ~ 1010M⊙, or the role of environmental effects. Thus, haloes that are 'TBTF', do not fail ΛCDM, but haloes that are 'too small to pass' (the galaxy formation threshold) provide a future test of ΛCDM.",
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    T2 - Too big does not fail-reconciling the conflict between ΛCDM predictions and the circular velocities of nearby field galaxies

    AU - Dutton, Aaron A.

    AU - Maccio, Andrea

    AU - Frings, Jonas

    AU - Wang, Liang

    AU - Stinson, Gregory S.

    AU - Penzo, Camilla

    AU - Kang, Xi

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    N2 - We compare the half-light circular velocities, V1/2, of dwarf galaxies in the Local Group to the predicted circular velocity curves of galaxies in the Numerical Investigations of Hundred Astrophysical Objects (NIHAO) suite of Λ cold dark matter (ΛCDM) simulations. We use a subset of 34 simulations in which the central galaxy has a stellar luminosity in the range 0.5×105 <LV/L⊙ <2×108. The NIHAOgalaxy simulations reproduce the relation between stellar mass and halo mass from abundance matching, as well as the observed half-light size versus luminosity relation. The corresponding dissipationless simulations overpredict the V1/2, recovering the problem known as too big to fail (TBTF). By contrast, the NIHAO simulations have expanded dark matter haloes, and provide an excellent match to the distribution of V1/2 for galaxies with LV ≥ 2 × 106 L⊙. For lower luminosities, our simulations predict very little halo response, and tend to overpredict the observed circular velocities. In the context of ΛCDM, this could signal the increased stochasticity of star formation in haloes below Mhalo ~ 1010M⊙, or the role of environmental effects. Thus, haloes that are 'TBTF', do not fail ΛCDM, but haloes that are 'too small to pass' (the galaxy formation threshold) provide a future test of ΛCDM.

    AB - We compare the half-light circular velocities, V1/2, of dwarf galaxies in the Local Group to the predicted circular velocity curves of galaxies in the Numerical Investigations of Hundred Astrophysical Objects (NIHAO) suite of Λ cold dark matter (ΛCDM) simulations. We use a subset of 34 simulations in which the central galaxy has a stellar luminosity in the range 0.5×105 <LV/L⊙ <2×108. The NIHAOgalaxy simulations reproduce the relation between stellar mass and halo mass from abundance matching, as well as the observed half-light size versus luminosity relation. The corresponding dissipationless simulations overpredict the V1/2, recovering the problem known as too big to fail (TBTF). By contrast, the NIHAO simulations have expanded dark matter haloes, and provide an excellent match to the distribution of V1/2 for galaxies with LV ≥ 2 × 106 L⊙. For lower luminosities, our simulations predict very little halo response, and tend to overpredict the observed circular velocities. In the context of ΛCDM, this could signal the increased stochasticity of star formation in haloes below Mhalo ~ 1010M⊙, or the role of environmental effects. Thus, haloes that are 'TBTF', do not fail ΛCDM, but haloes that are 'too small to pass' (the galaxy formation threshold) provide a future test of ΛCDM.

    KW - Cosmology: theory

    KW - Dark matter

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    KW - Galaxies: haloes

    KW - Galaxies: kinematics and dynamics

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