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 |
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| 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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