近30年来M82射电源通量密度变化
Flux density variations of radio sources in M82 over the last 3 decades
摘要：
本文介绍了2009-2010年星暴星系M82的监测会议的结果，获得了多元素无线电链接干涉仪网络（MERLIN）在5GHz和e-MERLIN在6 GHz。结合几个5GHz的MERLIN历元，形成一个33.0 μ Jy/bm噪声水平的地图，52个离散源，主要是超新星遗迹和HII区，被确定。其中包括三个在2002年5 GHz MERLIN监测会议中没有检测到的物体：超新星SN 2008 iz，瞬变源43.78+59.3和一个新的超新星遗迹壳。研究了长期（1981 ~ 2010年）、中期（2002 ~ 2010年）和短期（2009 ~ 2010年）通量密度的变化。我们发现，在M82的SNR的通量密度保持恒定的大部分样品（~95%）。此外，除了SN 2008 iz和众所周知的可变源41.95+57.5之外，还有两个源在2009-2010年期间显示出短期和中期变化。这些源是M82中最紧凑的SNR之一，这些通量密度的变化可能是由于激波传播的星周和星际介质的变化。
英文摘要：
This paper presents the results of the 2009-2010 monitoring sessions of the starburst galaxy M82, obtained with the Multi-Element Radio-Linked Interferometer Network (MERLIN) at 5GHz and e-MERLIN at 6GHz. Combining several 5GHz MERLIN epochs to form a map with 33.0 uJy/bm noise level, 52 discrete sources, mostly supernova remnants and HII regions, are identified. These include three objects which were not detected in the 2002 5GHz MERLIN monitoring session: supernova SN2008iz, the transient source 43.78+59.3, and a new supernova remnant shell. Flux density variations, in the long (1981 to 2010), medium (2002 to 2010) and short (2009 to 2010) term, are investigated. We find that flux densities of SNRs in M82 stay constant in most of the sample (~95%). In addition, aside from SN2008iz and the well-known variable source 41.95+57.5, two sources display short and medium term variations over the period 2009-2010. These sources being among the most compact SNR in M82, these flux density variations could be due to changes in the circumstellar and interstellar medium in which the shocks travel.
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