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Starburst Energy Fe...
Starburst Energy Feedback Seen through HCO+/HOC+ Emission in NGC 253 from ALCHEMI
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- Harada, Nanase (author)
- Academia Sinica Taiwan,National Astronomical Observatory of Japan,The Graduate University for Advanced Studies (SOKENDAI)
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- Martin, Sergio (author)
- Atacama Large Millimeter-submillimeter Array (ALMA),European Southern Observatory Santiago
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- Mangum, Jeffrey G. (author)
- National Radio Astronomy Observatory
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- Sakamoto, Kazushi (author)
- Academia Sinica Taiwan
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- Muller, Sebastien, 1976 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Tanaka, Kunihiko (author)
- Keio University
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- Nakanishi, Kouichiro (author)
- The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan
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- Herrero-Illana, Ruben (author)
- European Southern Observatory Santiago,Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
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- Yoshimura, Yuki (author)
- University of Tokyo, Japan
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- Muhle, Stefanie (author)
- Universität Bonn,University of Bonn
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- Aladro, Rebeca (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Colzi, Laura (author)
- Istituto nazionale di astrofisica (INAF)
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- Rivilla, Victor M. (author)
- Istituto nazionale di astrofisica (INAF)
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- Aalto, Susanne, 1964 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Behrens, Erica (author)
- University of Virginia
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- Henkel, Christian (author)
- King Abdulaziz University,Chinese Academy of Sciences,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Holdship, Jonathan (author)
- Universiteit Leiden (UL),Leiden University (UL),University College London (UCL)
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- Humire, P. K. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Meier, David S. (author)
- National Radio Astronomy Observatory Socorro,New Mexico Institute of Mining and Technology
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- Nishimura, Yuri (author)
- University of Tokyo, Japan,National Astronomical Observatory of Japan
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- van der Werf, Paul P. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Viti, Serena (author)
- Universiteit Leiden (UL),Leiden University (UL),University College London (UCL)
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(creator_code:org_t)
- 2021-12-08
- 2021
- English.
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In: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 923:1
- Related links:
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https://discovery.uc...
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https://research.cha...
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https://doi.org/10.3...
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Abstract
Subject headings
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- Molecular abundances are sensitive to the UV photon flux and cosmic-ray ionization rate. In starburst environments, the effects of high-energy photons and particles are expected to be stronger. We examine these astrochemical signatures through multiple transitions of HCO+ and its metastable isomer HOC+ in the center of the starburst galaxy NGC 253 using data from the Atacama Large Millimeter/submillimeter Array large program ALMA Comprehensive High-resolution Extragalactic Molecular inventory. The distribution of the HOC+(1-0) integrated intensity shows its association with "superbubbles," cavities created either by supernovae or expanding H ii regions. The observed HCO+/HOC+ abundance ratios are similar to 10-150, and the fractional abundance of HOC+ relative to H-2 is similar to 1.5 x 10(-11)-6 x 10(-10), which implies that the HOC+ abundance in the center of NGC 253 is significantly higher than in quiescent spiral arm dark clouds in the Galaxy and the Galactic center clouds. Comparison with chemical models implies either an interstellar radiation field of G (0) greater than or similar to 10(3) if the maximum visual extinction is greater than or similar to 5, or a cosmic-ray ionization rate of zeta greater than or similar to 10(-14) s(-1) (3-4 orders of magnitude higher than that within clouds in the Galactic spiral arms) to reproduce the observed results. From the difference in formation routes of HOC+, we propose that a low-excitation line of HOC+ traces cosmic-ray dominated regions, while high-excitation lines trace photodissociation regions. Our results suggest that the interstellar medium in the center of NGC 253 is significantly affected by energy input from UV photons and cosmic rays, sources of energy feedback.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Harada, Nanase
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Martin, Sergio
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Mangum, Jeffrey ...
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Sakamoto, Kazush ...
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Muller, Sebastie ...
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Tanaka, Kunihiko
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Nakanishi, Kouic ...
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Herrero-Illana, ...
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Yoshimura, Yuki
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Muhle, Stefanie
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Aladro, Rebeca
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Colzi, Laura
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Rivilla, Victor ...
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Aalto, Susanne, ...
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Behrens, Erica
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Henkel, Christia ...
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Holdship, Jonath ...
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Humire, P. K.
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Meier, David S.
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Nishimura, Yuri
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van der Werf, Pa ...
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Viti, Serena
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Meteorology and ...
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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Chalmers University of Technology