Molecular Outflows in Local ULIRGs: Energetics from Multitransition OH Analysis
| Autor: | V. Lebouteiller, M. L. N. Ashby, Sylvain Veilleux, K. P. Stewart, A. Janssen, Duncan Farrah, Eckhard Sturm, N. Falstad, H. W. W. Spoon, Marcio Melendez, Javier Graciá-Carpio, Eduardo González-Alfonso, Howard A. Smith, J. Fischer |
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| Přispěvatelé: | Universidad de Alcalá - University of Alcalá (UAH), Neurobiologie des signaux intercellulaires (NSI), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Harvard-Smithsonian Center for Astrophysics (CfA), Harvard University-Smithsonian Institution, University of Maryland [College Park], University of Maryland System, Max Planck Institute for Extraterrestrial Physics (MPE), Max-Planck-Gesellschaft, Department of Physics [Blacksburg], Virginia Tech [Blacksburg], Chalmers University of Technology [Göteborg], Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Smithsonian Institution-Harvard University [Cambridge], Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Harvard University [Cambridge]-Smithsonian Institution |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
[PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]
[PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM] Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Luminosity infrared: galaxies [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] 0103 physical sciences Radiative transfer Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Physics Luminous infrared galaxy Momentum (technical analysis) 010308 nuclear & particles physics Energetics Astronomy and Astrophysics line: profiles Astrophysics - Astrophysics of Galaxies Supernova ISM: jets and outflows [PHYS.ASTR.GA]Physics [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA] Radiation pressure 13. Climate action Space and Planetary Science radiative transfer Astrophysics of Galaxies (astro-ph.GA) Outflow line: formation galaxies: ISM |
| Zdroj: | The Astrophysical journal letters The Astrophysical journal letters, 2017, 836 (1), pp.11. ⟨10.3847/1538-4357/836/1/11⟩ The Astrophysical journal letters, Bristol : IOP Publishing, 2017, 836 (1), pp.11. ⟨10.3847/1538-4357/836/1/11⟩ |
| ISSN: | 2041-8205 2041-8213 |
| DOI: | 10.3847/1538-4357/836/1/11⟩ |
| Popis: | International audience; We report on the energetics of molecular outflows in 14 local ultraluminous infrared galaxies (ULIRGs) that show unambiguous outflow signatures (P Cygni profiles or high-velocity absorption wings) in the far-infrared lines of OH measured with the Herschel/PACS spectrometer. All sample galaxies are gas-rich mergers at various stages of the merging process. Detection of both ground-state (at 119 and 79 μm) and one or more radiatively excited (at 65 and 84 μm) lines allows us to model the nuclear gas (≲300 pc) and the more extended components using spherically symmetric radiative transfer models. Reliable models and the corresponding energetics are found in 12 of the 14 sources. The highest molecular outflow velocities are found in buried sources, in which slower but massive expansion of the nuclear gas is also observed. With the exception of a few outliers, the outflows have momentum fluxes of (2-5) × L IR/c and mechanical luminosities of (0.1-0.3)% of L IR. The moderate momentum boosts in these sources (≲3) suggest that the outflows are mostly momentum driven by the combined effects of active galactic nuclei (AGNs) and nuclear starbursts, as a result of radiation pressure, winds, and supernova remnants. In some sources (˜20%), however, powerful (1010.5-11 L ⊙) AGN feedback and (partially) energy-conserving phases are required, with momentum boosts in the range of 3-20. These outflows appear to be stochastic, strong AGN feedback events that occur throughout the merging process. In a few sources, the outflow activity in the innermost regions has subsided in the past ˜1 Myr. While OH traces the molecular outflows at subkiloparsec scales, comparison of the masses traced by OH with those previously inferred from tracers of more extended outflowing gas suggests that most mass is loaded (with loading factors of \dot{M}/{SFR}=1{--}10) from the central galactic cores (a few × 100 pc), qualitatively consistent with an ongoing inside-out quenching of star formation. Outflow depletion timescales are |
| Databáze: | OpenAIRE |
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