标题： M83中历史超新星的射电和X射线研究 显示英文标题

标题： A Radio and X-Ray Study of Historical Supernovae in M83

摘要： 我们报告了使用甚大阵列对M83星系中六颗历史超新星（SNe）进行了15年的射电观测结果。 我们注意到，II型超新星SN 1957D的射电辐射近似线性下降，它仍然是非热射电源。 从I型超新星SNe 1923A和1950B测量到的流量密度已趋于平稳，因为它们开始低于可探测的阈值而逐渐变暗。 这三颗超新星的亮度与类似阶段的其他几十年前的超新星的射电亮度相当。 SNe 1945B、1968L和1983N在最近的观测中未被检测到，这些未检测结果与之前的研究一致。 我们利用钱德拉X射线天文台报告了这六颗历史超新星的X射线未检测结果，与之前对其他几十年前超新星的X射线搜索结果一致，并且推测其前身星的质量流失率较低。 显示英文摘要

摘要： 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 non-thermal radio emitter. The measured flux densities from SNe 1923A and 1950B have flattened as they begin to fade below detectable limits, 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 non-detections are consistent with previous studies. We report the X-ray non-detections 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.