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ALCHEMI, an ALMA Co...
ALCHEMI, an ALMA Comprehensive High-resolution Extragalactic Molecular Inventory: Survey presentation and first results from the ACA array
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- Martin, S. (author)
- European Southern Observatory Santiago,Atacama Large Millimeter-submillimeter Array (ALMA)
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- Mangum, J. G. (author)
- National Radio Astronomy Observatory
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- Harada, N. (author)
- Academia Sinica Taiwan,The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan
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- Costagliola, Francesco, 1981 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Sakamoto, K. (author)
- Academia Sinica Taiwan
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- Muller, Sebastien, 1976 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Aladro, Rebeca, 1979 (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Tanaka, Kunihiko (author)
- Keio University
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- Yoshimura, Y. (author)
- University of Tokyo, Japan
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- Nakanishi, K. (author)
- National Astronomical Observatory of Japan,The Graduate University for Advanced Studies (SOKENDAI)
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- Herrero-Illana, R. (author)
- European Southern Observatory Santiago,Institut de Ciències de l'Espai (ICE) - CSIC,Institute of Space Sciences (ICE) - CSIC
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- Muhle, S. (author)
- Universität Bonn,University of Bonn
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- Aalto, Susanne, 1964 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Behrens, E. (author)
- University of Virginia
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- Colzi, L. (author)
- Centro de Astrobiologia (CAB),Osservatorio Astrofisico di Arcetri,Arcetri Astrophysical Observatory
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- Emig, K.L. (author)
- National Radio Astronomy Observatory
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- Fuller, G. A. (author)
- Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA),University of Manchester
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- Burillo, S. G. (author)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Greve, T. R. (author)
- Danmarks Tekniske Universitet,Technical University of Denmark,University College London (UCL)
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- Henkel, C. (author)
- Chinese Academy of Sciences,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),King Abdulaziz University
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- Holdship, Jonathan (author)
- University College London (UCL),Universiteit Leiden (UL),Leiden University (UL)
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- Humire, Pedro (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Hunt, L. K. (author)
- Osservatorio Astrofisico di Arcetri,Arcetri Astrophysical Observatory
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- Izumi, T. (author)
- The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan
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- Kohno, K. (author)
- University of Tokyo, Japan
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- König, Sabine, 1983 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Meier, D. S. (author)
- National Radio Astronomy Observatory Socorro,New Mexico Institute of Mining and Technology
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- Nakajima, T. (author)
- Nagoya University
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- Nishimura, Y. (author)
- University of Tokyo, Japan,National Astronomical Observatory of Japan
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- Padovani, M. (author)
- Osservatorio Astrofisico di Arcetri,Arcetri Astrophysical Observatory
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- Rivilla, Víctor M. (author)
- Osservatorio Astrofisico di Arcetri,Arcetri Astrophysical Observatory,Centro de Astrobiologia (CAB)
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- Takano, S. (author)
- Nihon University
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- van der Werf, P. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Viti, Serena (author)
- University College London (UCL),Universiteit Leiden (UL),Leiden University (UL)
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- Yan, Y. T. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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(creator_code:org_t)
- 2021-12-03
- 2021
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 656
- Related links:
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Abstract
Subject headings
Close
- Context. The interstellar medium is the locus of physical processes affecting the evolution of galaxies which drive or are the result of star formation activity, supermassive black hole growth, and feedback. The resulting physical conditions determine the observable chemical abundances that can be explored through molecular emission observations at millimeter and submillimeter wavelengths. Aims. Our goal is to unveiling the molecular richness of the central region of the prototypical nearby starburst galaxy NGC 253 at an unprecedented combination of sensitivity, spatial resolution, and frequency coverage. Methods. We used the Atacama Large Millimeter/submillimeter Array (ALMA), covering a nearly contiguous 289 GHz frequency range between 84.2 and 373.2 GHz, to image the continuum and spectral line emission at 1.6″(∼28 pc) resolution down to a sensitivity of 30 - 50 mK. This article describes the ALMA Comprehensive High-resolution Extragalactic Molecular Inventory (ALCHEMI) large program. We focus on the analysis of the spectra extracted from the 15″ (∼255 pc) resolution ALMA Compact Array data. Results. We modeled the molecular emission assuming local thermodynamic equilibrium with 78 species being detected. Additionally, multiple hydrogen and helium recombination lines are identified. Spectral lines contribute 5 to 36% of the total emission in frequency bins of 50 GHz. We report the first extragalactic detections of C2H5OH, HOCN, HC3HO, and several rare isotopologues. Isotopic ratios of carbon, oxygen, sulfur, nitrogen, and silicon were measured with multiple species. Concluison. Infrared pumped vibrationaly excited HCN, HNC, and HC3N emission, originating in massive star formation locations, is clearly detected at low resolution, while we do not detect it for HCO+. We suggest high temperature conditions in these regions driving a seemingly "carbon-rich"chemistry which may also explain the observed high abundance of organic species close to those in Galactic hot cores. The Lvib/LIR ratio was used as a proxy to estimate a 3% contribution from the proto super star cluster to the global infrared emission. Measured isotopic ratios with high dipole moment species agree with those within the central kiloparsec of the Galaxy, while those derived from 13C/18O are a factor of five larger, confirming the existence of multiple interstellar medium components within NGC 253 with different degrees of nucleosynthesis enrichment. The ALCHEMI data set provides a unique template for studies of star-forming galaxies in the early Universe.
Subject headings
- 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)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
Keyword
- Galaxies: individual: NGC 253
- Line: identification
- Galaxies: starburst
- Galaxies: ISM
- Submillimeter: ISM
- ISM: molecules
Publication and Content Type
- art (subject category)
- ref (subject category)
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To the university's database
- By the author/editor
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Martin, S.
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Mangum, J. G.
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Harada, N.
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Costagliola, Fra ...
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Sakamoto, K.
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Muller, Sebastie ...
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show more...
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Aladro, Rebeca, ...
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Tanaka, Kunihiko
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Yoshimura, Y.
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Nakanishi, K.
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Herrero-Illana, ...
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Muhle, S.
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Aalto, Susanne, ...
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Behrens, E.
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Colzi, L.
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Emig, K.L.
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Fuller, G. A.
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Burillo, S. G.
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Greve, T. R.
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Henkel, C.
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Holdship, Jonath ...
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Humire, Pedro
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Hunt, L. K.
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Izumi, T.
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Kohno, K.
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König, Sabine, 1 ...
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Meier, D. S.
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Nakajima, T.
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Nishimura, Y.
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Padovani, M.
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Rivilla, Víctor ...
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Takano, S.
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van der Werf, P.
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Viti, Serena
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Yan, Y. T.
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- About the subject
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- NATURAL SCIENCES
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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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and Atom and Molecul ...
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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 Physical Geograp ...
- Articles in the publication
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Astronomy and As ...
- By the university
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Chalmers University of Technology