Local Starburst Conditions and Formation of GRB 980425/SN 1998bw within a Collisional Ring

Autor: S. C. Madden, Andrew J. Levan, V. Arumugam, E. Le Floc'h, Frederic Bournaud, S. Roychowdhury, D. Cormier, Martin Zwaan, Florent Renaud, Lise Christensen, Elena Pian, M. Arabsalmani
Přispěvatelé: Institut de RadioAstronomie Millimétrique (IRAM), Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), 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)
Rok vydání: 2020
Předmět:
Galaxy collisions
010504 meteorology & atmospheric sciences
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences
Starburst galaxies
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
Interstellar medium
Massive stars
Young massive clusters
0103 physical sciences
Molecular clouds
Astrophysics::Solar and Stellar Astrophysics
Star-forming regions
010303 astronomy & astrophysics
Solar and Stellar Astrophysics (astro-ph.SR)
Astrophysics::Galaxy Astrophysics
0105 earth and related environmental sciences
Physics
High Energy Astrophysical Phenomena (astro-ph.HE)
GRB 980425
Star formation
Molecular cloud
Astronomy and Astrophysics
Astrophysics - Astrophysics of Galaxies
Galaxy
Supernova
Star cluster
Galaxy dynamics
Supernovae
Astrophysics - Solar and Stellar Astrophysics
13. Climate action
Space and Planetary Science
Interacting galaxies
Astrophysics of Galaxies (astro-ph.GA)
Gamma-ray bursts
Gamma-ray burst
Astrophysics - High Energy Astrophysical Phenomena
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Zdroj: The Astrophysical Journal
Astrophys.J.
Astrophys.J., 2020, 899 (2), pp.165. ⟨10.3847/1538-4357/aba3c0⟩
Arabsalmani, M, Renaud, F, Roychowdhury, S, Arumugam, V, Floc'h, E L, Bournaud, F, Cormier, D, Zwaan, M A, Christensen, L, Pian, E, Madden, S & Levan, A 2020, ' Local Starburst Conditions and Formation of GRB 980425/SN 1998bw within a Collisional Ring ', Astrophysical Journal, vol. 899, no. 2, 165 . https://doi.org/10.3847/1538-4357/aba3c0
ISSN: 1538-4357
0004-637X
1538-3881
1538-3873
0004-6361
0147-0728
DOI: 10.3847/1538-4357/aba3c0
Popis: We present the first spatially resolved study of molecular gas in the vicinity of a Gamma Ray Burst, using CO(2-1) emission line observations with the Atacama Large Millimetre Array (ALMA) at ~50 pc scales. The host galaxy of GRB 980425 contains a ring of high column density HI 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 eleven molecular gas clumps in the galaxy, seven 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 categorised 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.
Comment: ApJ (in press), 12 pages, 4 figures, 1 table
Databáze: OpenAIRE
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