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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 . staa1243. doi:10.1093/mnras/staa1243 (In Press)

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Official URL: http://dx.doi.org/10.1093/mnras/staa1243

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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
Subjects: Q Science > QB Astronomy
Divisions: Faculty of 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: 6 May 2020
Dates:
DateEvent
6 May 2020Available
1 May 2020Accepted
Date of first compliant deposit: 12 May 2020
Article Number: staa1243
DOI: 10.1093/mnras/staa1243
Status: Peer Reviewed
Publication Status: In Press
Publisher Statement: 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
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
ST/P000495/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
839090[ERC] Horizon 2020 Framework Programmehttp://dx.doi.org/10.13039/100010661
PGC2018-095317-B-C21[ERDF] European Regional Development Fundhttp://dx.doi.org/10.13039/501100008530
CB-285080Consejo nacional de ciencia y tecnología (México)http://viaf.org/viaf/147206461
FC-2016-01-1916Consejo nacional de ciencia y tecnología (México)http://viaf.org/viaf/147206461
UNSPECIFIEDPAPIIT (Organization)http://viaf.org/viaf/144462803

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