Stockdale 2006 M83中历史上超新星的射电和X射线观测

主要内容:
15年的观测，包括6个超新星。SN 1957D, 1923A， 1950B 都是II型超新星； SNe 1945B, 1968L, and 1983N没有在最近的观测中看到，不过没看到正和模型符合。

精彩摘抄:
超新星在M83中的位置：

光变曲线，还包括几个其他的超新星，如1987A


文章信息:

Title:		A Radio and X-Ray Study of Historical Supernovae in M83
Authors:		Stockdale, Christopher J.; Maddox, Larry A.; Cowan, John J.; Prestwich, Andrea; Kilgard, Roy; Immler, Stefan

Publication:		The Astronomical Journal, Volume 131, Issue 2, pp. 889-894. (AJ Homepage)

Abstract

We report the results of 15 years of radio observations of the six historical supernovae (SNe) in M83 using the Very Large Array. We note the near-linear decline in radio emission from SN 1957D, a Type II SN, which remains a nonthermal radio emitter. The measured flux densities from SNe 1923A and 1950B have flattened as they begin to fade below detectable limits; they are also Type II SNe. The luminosities for these three SNe are comparable with the radio luminosities of other decades-old SNe at similar epochs. SNe 1945B, 1968L, and 1983N were not detected in the most recent observations, and these nondetections are consistent with previous studies. We report the X-ray nondetections of all six historical SNe using the Chandra X-Ray Observatory, consistent with previous X-ray searches of other decades-old SNe and low inferred mass-loss rates of the progenitors [M˙~(10^-8 M_solar yr^-1)(v_w/10 km s^-1)].