An H II Region Associated with SN 1978K?

Details An H II Region Associated with SN 1978K? An H II Region Associated with SN 1978K?

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...488..792m&link_type=abstract

Astrophysical Journal v.488, p.792

Astronomy and Astrophysics

Astronomy

25

Ism: H Ii Regions, Radio Continuum: Ism, Stars: Supernovae: Individual Alphanumeric: Sn 1978K

Scientific paper

A reanalysis of the radio data for the supernova (SN) 1978K from Ryder et al. clearly shows the expected early-time radio flux density evolution that is characteristic of normal Type II supernovae. However, for the first time ever seen in a radio supernova, the data indicate the need for a time-independent, free-free absorption component along the line of sight. We interpret this constant absorption term as indicative of the presence of an H II region along the line of sight to SN 1978K. More speculatively, this could represent a part of an region associated with the progenitor of SN 1978K. From the available optical and radio data, it is possible not only to describe the characteristics of the circumstellar medium around SN 1978K giving rise to its radio emission, but also to estimate the properties for this intervening H II region. It thus appears that low-frequency observations of radio supernovae at late times may aid in the detection of H II regions along the line of sight, possibly related to the presupernova star's formation environment.

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