Arp 299年轻超新星和超新星遗迹的射电辐射
Radio Emission from Young Supernovae and Supernova Remnants in Arp 299
摘要：
我们在2003年至2005年期间的18个月内拍摄了附近合并星系Arp 299的四个时期的敏感毫角秒分辨率无线电图像。合并后的数据显示，在两个主要合并核中共有30个点源。其中25个在东北核（成分“A”=IC 694），直径约100 pc，而5个在西南核（成分“B1”=NGC 3690），直径约30 pc。这些天体被解释为年轻的超新星和超新星遗迹; A核和B1核中的源计数之比近似等于它们预测的超新星速率之比。A核的近似光度函数已经被推导出来，并表明它可能包含多达500-1000个比Cas A更强大的致密射电源;这些源的积分通量密度约为低分辨率下总通量密度的20%。2005年上半年，一颗新的超新星发生在B1核，其峰值射电功率至少是仙后座A目前功率的2,000倍。这颗超新星位于一个明显更老的超新星遗迹的0.4 pc（投影距离）之内，这很可能表明在B1核内存在一个巨大的超级星团。将我们致密射电源的典型射电源通量密度与观测到的A核和B1核的X射线光度进行比较，表明每个核中的一个射电源实际上可能与一个活动星系核有关，而不是超新星遗迹。
英文摘要：
We have made sensitive milliarcsecond-resolution radio images of the nearby merger galaxy Arp 299 at four epochs spread over 18 months between 2003 and 2005. The combined data revealed a total of 30 point sources in the two primary merger nuclei. Twenty-five of these are found in the northeastern nucleus (component "A"=IC 694) over a region ~100 pc in diameter, while five are in the southwestern nucleus (component "B1"=NGC 3690) within a region ~30 pc in size. These objects are interpreted as young supernovae and supernova remnants; the ratio of the source counts in nuclei A and B1 is approximately equal to the ratio of their predicted supernova rates. An approximate luminosity function has been derived for nucleus A, and indicates that it might contain as many as 500-1000 compact radio sources more powerful than Cas A; the integrated flux density of these sources would be about 20% of the total flux density seen at lower resolution. A new supernova occurred in nucleus B1 in the first half of 2005, having a peak radio power at least 2,000 times the present power of Cassiopeia A. This supernova is located within 0.4 pc (projected distance) of an apparently older supernova remnant, making it very likely that this indicates the presence of a massive super star cluster within nucleus B1. Comparison of the typical radio flux densities of our compact radio sources to the observed X-ray luminosities of nuclei A and B1 indicates that it is possible that one radio source in each nucleus actually could be associated with an active galactic nucleus rather than being a supernova remnant.
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