An Australia Telescope Compact Array 20-cm radio continuum study of the Large Magellanic Cloud

A. Hughes, Lister Staveley-Smith, S. Kim, M. Wolleben, M. Filipović

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    We present a mosaic image of the 1.4-GHz radio continuum emission from the Large Magellanic Cloud (LMC) observed with the Australia Telescope Compact Array (ATCA) and the Parkes Telescope. The mosaic covers 10 degrees.8 x 12 degrees.3 with an angular resolution of 40 arcsec, corresponding to a spatial scale of similar to 10 pc in the LMC. The final image is suitable for studying emission on all scales between 40 arcsec and the surveyed area. In this paper, we discuss (i) the characteristics of the LMC's diffuse and compact radio continuum emission, (ii) the fraction of the emission produced by thermal processes and the implied star formation rate in the LMC and (iii) variations in the radio spectral index across the LMC. Two non-standard reduction techniques that we used to process the ATCA visibility data may be of interest for future wide-field radio continuum surveys. The data are open to the astronomical community and should be a rich resource for studies of individual objects such as supernova remnants, H II regions and planetary nebulae as well as extended features such as the diffuse emission from synchrotron radiation.
    Original languageEnglish
    Pages (from-to)543-552
    JournalMonthly Notices of the Royal Astronomical Society
    Issue number2
    Publication statusPublished - 2007


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