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Studying the environment of AT 2018cow with MUSE
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Lyman, J. D., Galbany, L., Sánchez, S. F., Anderson, J. P. and Kuncarayakti, H. (2020) Studying the environment of AT 2018cow with MUSE. Monthly Notices of the Royal Astronomical Society, 495 (1). pp. 992-999. staa1243. doi:10.1093/mnras/staa1243 ISSN 1745-3933.
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Official URL: http://dx.doi.org/10.1093/mnras/staa1243
Abstract
AT 2018cow was the nearest and best studied example of a new breed of extra-galactic, luminous and rapidly-evolving transient. Both the progenitor systems and explosion mechanisms of these rapid transients remain a mystery – the energetics, spectral signatures, and timescales make them challenging to interpret in established classes of supernovae and tidal disruption events. The rich, multi-wavelength data-set of AT 2018cow has still left several interpretations viable to explain the nature of this event. In this paper we analyse integral-field spectroscopic data of the host galaxy, CGCG 137-068, to compare environmental constraints with leading progenitor models. We find the explosion site of AT 2018cow to be very typical of core-collapse supernovae (known to form from stars with MZAMS ∼ 8 − 25 M⊙), and infer a young stellar population age at the explosion site of few × 10 Myr, at slightly sub-solar metallicity. When comparing to expectations for exotic intermediate-mass black hole (IMBH) tidal disruption events, we find no evidence for a potential host system of the IMBH. In particular, there are no abrupt changes in metallicity or kinematics in the vicinity of the explosion site, arguing against the presence of a distinct host system. The proximity of AT 2018cow to strong star-formation in the host galaxy makes us favour a massive stellar progenitor for this event.
Item Type: | Journal Article | |||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | |||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Supernovae, Astrophysics, Stars | |||||||||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||||||||
Publisher: | Oxford University Press | |||||||||||||||||||||
ISSN: | 1745-3933 | |||||||||||||||||||||
Official Date: | 1 June 2020 | |||||||||||||||||||||
Dates: |
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Volume: | 495 | |||||||||||||||||||||
Number: | 1 | |||||||||||||||||||||
Page Range: | pp. 992-999 | |||||||||||||||||||||
Article Number: | staa1243 | |||||||||||||||||||||
DOI: | 10.1093/mnras/staa1243 | |||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||
Reuse Statement (publisher, data, author rights): | This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record J D Lyman, L Galbany, S F Sánchez, J P Anderson, H Kuncarayakti, Studying the environment of AT 2018cow with MUSE, Monthly Notices of the Royal Astronomical Society, , staa1243, https://doi.org/10.1093/mnras/staa1243 is available online at: https://doi.org/10.1093/mnras/staa1243 | |||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||
Date of first compliant deposit: | 12 May 2020 | |||||||||||||||||||||
Date of first compliant Open Access: | 14 May 2020 | |||||||||||||||||||||
RIOXX Funder/Project Grant: |
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