A New Look at Radio Supernova Remnants
A New Look at Radio Supernova Remnants
复制标题
射电超新星遗迹的新视角
DOI：
10.1071/ph840321
复制
发表时间：
1984
期刊：
影响因子：
--
通讯作者：
J. M. Durdin
中科院分区：
文献类型：
--
作者：
B. Mills;A. Turtle;A. Little;J. M. Durdin
本文提供了大麦哲伦星云和小麦哲伦星云中射电超新星遗迹的星表，以及以843兆赫频率和43 × 45角秒分辨率绘制的大麦哲伦星云遗迹图。38个确认的残留物被认为代表了直径小于约40 pc的相当完整的样本，尽管LMC目录对于较大直径可能非常不完整。将超新星遗迹（SNRs）与Clark和Caswell（1976）的星表中的银河系遗迹进行比较，发现它们在许多方面是相似的。特别是一个距离尺度来自云信噪比再现直接测量银河校准的平均距离。通常的SNR从小直径快速扩展的模型不支持的数量-直径关系的统计，这表明，快速扩展到相当大的直径是常见的。物理影响进行了讨论。银河系每世纪约有四颗超新星，而两个麦哲伦星云加起来每世纪约有一颗。
Catalogues are presented of radio supernova remnants in both Large (LMC) and Small (SMC) Magellanic Clouds together with maps of the LMC remnants prepared at a frequency of 843 MHz and with a resolution of 43 x 45 arcsec. The 38 confirmed remnants are believed to represent a reasonably complete sample for diameters less than about 40 pc although the LMC catalogue is probably very incomplete for larger diameters. The supernova remnants (SNRs) are compared with the Galactic remnants in the catalogue of Clark and Caswell (1976) and they are found to be similar in many ways. In particular a distance scale derived from the Cloud SNRs reproduces well the mean distances of directly measured Galactic calibrators. The usual model of a SNR expanding adiabatically from a small diameter is not supported by the statistics of the numberdiameter relation which suggest that rapid expansion up to quite large diameters is common. The physical implications are discussed. A supernova rate of about four per century is derived for the Galaxy and about one per century for the two Magellanic Clouds combined.