Is 41.95+575 in M82 actually an SNR?

T W B Muxlow, A Pedlar, R J Beswick, M K Argo, T J O'Brien, D Fenech, W Trotman

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The radio supernovae and supernova remnants (SNR) in the nearby starburst galaxy M82 have been the subject of intense study by a number of research groups for many years. Recent high-resolution radio imaging with MERLIN and VLBI resolve all the ˜30 SNR found within the central kiloparsec of M82 indicating that they are less than ˜2000 years old. Global VLBI studies of one of these objects, 41.95+575, show an unusual double-lobed structure with a modest expansion speed of ˜1800 km/s and an age of around 100 years. The flux density of 41.95+575 has been decreasing at 8.8%/year since monitoring began in the 1960s, inferring that at outburst the flux density would have been around 100 Jy! In addition, MERLIN 408 MHz imaging shows that 41.95+575 sits at the centre of a compact HII region with a radius of ˜100 light years. We explore the possibility that 41.95+575 is not a conventional SNR, but the decaying product of a violent GRB event in M82 which occurred around 100 years ago.
    Original languageEnglish
    JournalMemorie della Società Astronomica Italiana
    Volume76
    Publication statusPublished - 2005

    Keywords

    • galaxies: GRB
    • galaxies: starburst
    • galaxies: ISM
    • supernova remnants: invidual:41.95+575

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