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 metallici...

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Bibliographic Details
Published in:	Astrophysical journal. Letters 2017-11, Vol.849 (1), p.L4
Main Authors:	Chen, Ting-Wan, Schady, Patricia, Xiao, Lin, Eldridge, J. J., Schweyer, Tassilo, Lee, Chien-Hsiu, Yu, Po-Chieh, Smartt, Stephen J., Inserra, Cosimo
Format:	Article
Language:	eng
Subjects:	ASTROPHYSICS, COSMOLOGY AND ASTRONOMY COSMIC GAMMA BURSTS Dwarf galaxies GALAXIES galaxies: general galaxies: individual (NGC 3191) Gamma ray bursts Gamma rays LIMITING VALUES LUMINOSITY LYMAN LINES MASS METALLICITY Position measurement Progenitors (astrophysics) Spectral analysis Spectrum analysis Spiral galaxies Stars & galaxies Stellar mass Supernova SUPERNOVAE supernovae: general supernovae: individual (SN 2017egm) VELOCITY
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Summary:	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 ( ). Additionally, we measure a small H equivalent width (EW) at the SN position of just 34 , 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.
ISSN:	2041-8205 2041-8213