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THE RADIO DETECTION OF SN 1968D IN NGC 6946

机译:NGC 6946中SN 1968D的无线电检测

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We report the radio detection of the Type Ⅱ supernova SN 1968D in the nearby spiral galaxy NGC 6946 from continuum observations at 6 and 21 cm using the Very Large Array. This radio detection is ~26 yr after its optical discovery. SN 1968D is only the fourth "intermediate-age" SN ever recovered in the radio. The current flux densities of this supernova at these wavelengths are consistent with the extrapolated radio behavior of another Type Ⅱ supernova in this galaxy, the well-studied supernova SN 1980K. It is therefore likely that the radio emission from SN 1968D arises from the same mechanism as for SN 1980K and other known radio supernovae, i.e., interaction of the supernova shock with preexisting circumstellar matter.
机译:我们报告了使用超大型天线阵在6和21 cm处的连续观测,对附近的旋涡星系NGC 6946中的Ⅱ型超新星SN 1968D进行了无线电探测。这种无线电探测是在其光学发现后约26年。 SN 1968D只是无线电中恢复的第四个“中级” SN。在这些波长下,该超新星的电流通量密度与该星系中另一种Ⅱ型超新星(经过充分研究的超新星SN 1980K)的外推放射性行为一致。因此,SN 1968D的无线电发射很可能来自与SN 1980K和其他已知的无线电超新星相同的机制,即超新星震动与先前存在的星际物质的相互作用。

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