Flux density variations of radio sources in M82 over the last three decades
作者： M. A. Gendre , D. M. Fenech , R. J. Beswick , T. W. B. Muxlow , M. K. Argo
DOI: 10.1093/MNRAS/STT231
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摘要: This paper presents the results of 2009-2010 monitoring sessions starburst galaxy M82, obtained with Multi-Element Radio-Linked Interferometer Network (MERLIN) at 5GHz and e-MERLIN 6GHz. Combining several MERLIN epochs to form a map 33.0 uJy/bm noise level, 52 discrete sources, mostly supernova remnants HII regions, are identified. These include three objects which were not detected in 2002 session: SN2008iz, transient source 43.78+59.3, new remnant shell. Flux density variations, long (1981 2010), medium (2002 2010) short (2009 term, investigated. We find that flux densities SNRs M82 stay constant most sample (~95%). In addition, aside from SN2008iz well-known variable 41.95+57.5, two sources display term variations over period 2009-2010. being among compact SNR these could be due changes circumstellar interstellar shocks travel.
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