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Local Starburst Con...
Local Starburst Conditions and Formation of GRB 980425/SN 1998bw within a Collisional Ring
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- Arabsalmani, M. (author)
- University of Western Australia, Crawley,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)
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- Renaud, F. (author)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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- Roychowdhury, S. (author)
- University of Western Australia, Crawley,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)
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- Arumugam, V. (author)
- Institut de Radioastronomie Millimétrique IRAM
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- Floc'h, E. Le (author)
- University of Paris-Saclay,Paris Diderot University
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- Bournaud, F. (author)
- Paris Diderot University,University of Paris-Saclay
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- Cormier, D. (author)
- Paris Diderot University,University of Paris-Saclay
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- Zwaan, M. A. (author)
- European Southern Observatory
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- Christensen, L. (author)
- Niels Bohr Institute
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- Pian, E. (author)
- INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna
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- Madden, S. (author)
- Paris Diderot University,University of Paris-Saclay
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- Levan, A. (author)
- University of Warwick
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(creator_code:org_t)
- 2020-08-26
- 2020
- English.
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In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 899:2
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http://dx.doi.org/10...
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Abstract
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- We present the first spatially resolved study of molecular gas in the vicinity of a gamma-ray burst (GRB), using CO(2-1) emission-line observations with the Atacama Large Millimetre Array at ∼50 pc scales. The host galaxy of GRB 980425 contains a ring of high column density H i gas, which is likely to have formed due to a collision between the GRB host and its companion galaxy, within which the GRB is located. We detect 11 molecular gas clumps in the galaxy, 7 of which are within the gas ring. The clump closest to the GRB position is at a projected separation of ∼280 pc. Although it is plausible that the GRB progenitor was ejected from clusters formed in this clump, we argue that the in situ formation of the GRB progenitor is the most likely scenario. We measure the molecular gas masses of the clumps and find them to be sufficient for forming massive star clusters. The molecular gas depletion times of the clumps show a variation of ∼2 dex, comparable with the large variation in depletion times found in starburst galaxies in the nearby universe. This demonstrates the presence of starburst modes of star formation on local scales in the galaxy, even while the galaxy as a whole cannot be categorized as a starburst based on its global properties. Our findings suggest that the progenitor of GRB 9802425 was originated in a young massive star cluster formed in the starburst mode of star formation.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Arabsalmani, M.
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Renaud, F.
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Roychowdhury, S.
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Arumugam, V.
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Floc'h, E. Le
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Bournaud, F.
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Cormier, D.
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Zwaan, M. A.
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Christensen, L.
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Pian, E.
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Madden, S.
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Levan, A.
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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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Astrophysical Jo ...
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Lund University