Radiative stellar feedback in galaxy formation: Methods and physics

Autor: Claude André Faucher-Giguère, Dušan Kereš, Nathan Butcher, Norman Murray, Philip F. Hopkins, Xiangcheng Ma, Michael Y. Grudić, Andrew Wetzel
Rok vydání: 2020
Předmět:
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
formation [galaxies]
Milky Way
astro-ph.GA
FOS: Physical sciences
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astronomy & Astrophysics
01 natural sciences
Luminosity
0103 physical sciences
Galaxy formation and evolution
Astrophysics::Solar and Stellar Astrophysics
010303 astronomy & astrophysics
Instrumentation and Methods for Astrophysics (astro-ph.IM)
Astrophysics::Galaxy Astrophysics
evolution [galaxies]
Physics
formation [stars]
theory [cosmology]
010308 nuclear & particles physics
Star formation
Astronomy and Astrophysics
Astrophysics - Astrophysics of Galaxies
Galaxy
Accretion (astrophysics)
Stars
Star cluster
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
active [galaxies]
astro-ph.CO
Astrophysics - Instrumentation and Methods for Astrophysics
Astronomical and Space Sciences
Astrophysics - Cosmology and Nongalactic Astrophysics
astro-ph.IM
Zdroj: Monthly Notices of the Royal Astronomical Society, vol 491, iss 3
Hopkins, Philip F; Grudic, Michael Y; Wetzel, Andrew R; Keres, Dusan; Gaucher-Giguere, Claude-Andre; Ma, Xiangcheng; et al.(2019). Radiative Stellar Feedback in Galaxy Formation: Methods and Physics. UC Davis: Retrieved from: http://www.escholarship.org/uc/item/0f3420fh
Popis: Radiative feedback (RFB) from stars plays a key role in galaxies, but remains poorly-understood. We explore this using high-resolution, multi-frequency radiation-hydrodynamics (RHD) simulations from the Feedback In Realistic Environments (FIRE) project. We study ultra-faint dwarf through Milky Way mass scales, including H+He photo-ionization; photo-electric, Lyman Werner, Compton, and dust heating; and single+multiple scattering radiation pressure (RP). We compare distinct numerical algorithms: ray-based LEBRON (exact when optically-thin) and moments-based M1 (exact when optically-thick). The most important RFB channels on galaxy scales are photo-ionization heating and single-scattering RP: in all galaxies, most ionizing/far-UV luminosity (~1/2 of lifetime-integrated bolometric) is absorbed. In dwarfs, the most important effect is photo-ionization heating from the UV background suppressing accretion. In MW-mass galaxies, meta-galactic backgrounds have negligible effects; but local photo-ionization and single-scattering RP contribute to regulating the galactic star formation efficiency and lowering central densities. Without some RFB (or other 'rapid' FB), resolved GMCs convert too-efficiently into stars, making galaxies dominated by hyper-dense, bound star clusters. This makes star formation more violent and 'bursty' when SNe explode in these hyper-clustered objects: thus, including RFB 'smoothes' SFHs. These conclusions are robust to RHD methods, but M1 produces somewhat stronger effects. Like in previous FIRE simulations, IR multiple-scattering is rare (negligible in dwarfs, ~10% of RP in massive galaxies): absorption occurs primarily in 'normal' GMCs with A_v~1.
Comment: 28 pages, 14 figures. Updated to match published MNRAS version
Databáze: OpenAIRE
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