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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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WRAP-studying-environment-AT-2018cow-MUSE-Lyman-2020.pdf - Accepted Version - Requires a PDF viewer. Download (2567Kb) | Preview |
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 > 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: |
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| 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: |
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