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Spatially resolved MaNGA observations of the host galaxy of superluminous supernova 2017EGM

Spatially resolved MaNGA observations of the host galaxy of superluminous supernova 2017EGM
Spatially resolved MaNGA observations of the host galaxy of superluminous supernova 2017EGM
Superluminous supernovae (SLSNe) are found predominantly in dwarf galaxies, indicating that their progenitors have a low metallicity. However, the most nearby SLSN to date, SN 2017egm, occurred in the spiral galaxy NGC 3191, which has a relatively high stellar mass and correspondingly high metallicity. In this Letter, we present detailed analysis of the nearby environment of SN 2017egm using MaNGA IFU data, which provides spectral data on kiloparsec scales. From the velocity map we find no evidence that SN 2017egm occurred within some intervening satellite galaxy, and at the SN position most metallicity diagnostics yield a solar and above solar metallicity ($12+\mathrm{log}({\rm{O}}/{\rm{H}})\sim 8.8\mbox{--}9.1$). Additionally, we measure a small Hα equivalent width (EW) at the SN position of just 34 Å, which is one of the lowest EWs measured at any SLSN or gamma-ray burst position, and indicative of the progenitor star being comparatively old. We also compare the observed properties of NGC 3191 with other SLSN host galaxies. The solar-metallicity environment at the position of SN 2017egm presents a challenge to our theoretical understanding, and our spatially resolved spectral analysis provides further constraints on the progenitors of SLSNe.
0004-637X
Chen, Ting-Wan
3b322da2-2fca-4502-a74a-32813f10f54d
Schady, Patricia
291fb063-ccd9-4c83-b48e-eef95f8d6e34
Xiao, Lin
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Eldridge, J.J.
ff1dad32-b300-4dce-8462-e74e3b38e764
Schweyer, Tassilo
04f77381-d0ec-4cff-8581-4cf59184b3fd
Lee, Chein-Hsiu
893f2958-6c41-446e-8648-a9aa6c9871fa
Yu, Po-Chieh
c5e6d33f-1bd6-471f-ad36-9c0091ba56c4
Smartt, Stephen
b62cd6ac-7cbd-4645-b688-28b54b335d76
Inserra, Cosimo
004da73f-5b5e-43f4-b1a7-aaa0e579672e
Chen, Ting-Wan
3b322da2-2fca-4502-a74a-32813f10f54d
Schady, Patricia
291fb063-ccd9-4c83-b48e-eef95f8d6e34
Xiao, Lin
5f15b00f-57d4-4583-ac07-4cbab9895030
Eldridge, J.J.
ff1dad32-b300-4dce-8462-e74e3b38e764
Schweyer, Tassilo
04f77381-d0ec-4cff-8581-4cf59184b3fd
Lee, Chein-Hsiu
893f2958-6c41-446e-8648-a9aa6c9871fa
Yu, Po-Chieh
c5e6d33f-1bd6-471f-ad36-9c0091ba56c4
Smartt, Stephen
b62cd6ac-7cbd-4645-b688-28b54b335d76
Inserra, Cosimo
004da73f-5b5e-43f4-b1a7-aaa0e579672e

Chen, Ting-Wan, Schady, Patricia, Xiao, Lin, Eldridge, J.J., Schweyer, Tassilo, Lee, Chein-Hsiu, Yu, Po-Chieh, Smartt, Stephen and Inserra, Cosimo (2017) Spatially resolved MaNGA observations of the host galaxy of superluminous supernova 2017EGM. The Astrophysical Journal, 849 (1). (doi:10.3847/2041-8213/aa8f40).

Record type: Article

Abstract

Superluminous supernovae (SLSNe) are found predominantly in dwarf galaxies, indicating that their progenitors have a low metallicity. However, the most nearby SLSN to date, SN 2017egm, occurred in the spiral galaxy NGC 3191, which has a relatively high stellar mass and correspondingly high metallicity. In this Letter, we present detailed analysis of the nearby environment of SN 2017egm using MaNGA IFU data, which provides spectral data on kiloparsec scales. From the velocity map we find no evidence that SN 2017egm occurred within some intervening satellite galaxy, and at the SN position most metallicity diagnostics yield a solar and above solar metallicity ($12+\mathrm{log}({\rm{O}}/{\rm{H}})\sim 8.8\mbox{--}9.1$). Additionally, we measure a small Hα equivalent width (EW) at the SN position of just 34 Å, which is one of the lowest EWs measured at any SLSN or gamma-ray burst position, and indicative of the progenitor star being comparatively old. We also compare the observed properties of NGC 3191 with other SLSN host galaxies. The solar-metallicity environment at the position of SN 2017egm presents a challenge to our theoretical understanding, and our spatially resolved spectral analysis provides further constraints on the progenitors of SLSNe.

Text
SPATIALLY RESOLVED MANGA OBSERVATIONS OF THE HOST GALAXY OF SUPERLUMINOUS - Accepted Manuscript
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More information

Accepted/In Press date: 26 September 2017
e-pub ahead of print date: 20 October 2017
Additional Information: author Inserra confirmed Arxvi record 1708.04618v2 is AM.

Identifiers

Local EPrints ID: 415905
URI: https://eprints.soton.ac.uk/id/eprint/415905
ISSN: 0004-637X
PURE UUID: c52ebc33-dcc5-4274-a707-96b04cac07a2
ORCID for Cosimo Inserra: ORCID iD orcid.org/0000-0002-3968-4409

Catalogue record

Date deposited: 28 Nov 2017 17:30
Last modified: 14 Aug 2019 17:12

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