Shell-like structure in 41.9 + 58, a powerful supernova remnant in M82

Details Shell-like structure in 41.9 + 58, a powerful supernova remnant in M82 Shell-like structure in 41.9 + 58, a powerful supernova remnant in M82

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.242..529w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 242, Feb. 15, 1990, p. 529-534.

Astronomy and Astrophysics

Astronomy

38

Luminosity, Radio Sources (Astronomy), Stellar Structure, Supernova Remnants, Astronomical Maps, Astronomical Models, Very Long Base Interferometry

Scientific paper

An EVN map of the compact radio source 41.9 + 58 in M82 reveals a distorted shell-like structure with dimensions 0.56 x 0.32 pc. This map, together with a limit on the present expansion velocity (less than 6500 km/s along the major axis) and the steady decay of the flux density (8.5 percent/yr for the past 25 yr), indicates that 41.9 + 58 is a powerful supernova remnant whose progenitor probably exploded 40-50 yr ago. Along with other examples, 41.9 + 58 has exhibited a radio luminosity 50-100 times greater than normal for remnants associated with optical type II supernovae, and it is suggested that such objects be classified as 'radio hypernova remnants'.

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