SIMBAD references

2020ApJ...890...15F - Astrophys. J., 890, 15-15 (2020/February-2)

Detection of late-time optical emission from SN 1941C in NGC 4136.


Abstract (from CDS):

We report the detection of broad, high-velocity oxygen emission lines from the site of SN 1941C nearly eight decades after outburst, making it the oldest optically detected historical core-collapse supernova (CCSN) and one of the youngest CCSN remnants with a well determined age. In contrast to the strongly blueshifted emission line profiles observed for other late-time CCSNe thought to be due to internal dust extinction of far-side hemisphere of expanding ejecta, SN 1941C's spectrum exhibits stronger redshifted than blueshifted emissions of [O I] 6300, 6364 Å, [O II] 7319, 7330 Å, and [O III] 4959, 5007 Å. These oxygen emissions exhibit rest-frame expansion velocities from -2200 to +4400kms–1. No other significant broad line emissions were detected including Hα emission. We discuss possible causes for this unusual spectrum and compare SN 1941C's optical and X-ray luminosities to other evolved CCSNe.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Supernova remnants - Core-collapse supernovae - Type II supernovae - Interstellar emissions

Simbad objects: 35

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