Journal Article

AMI observations of northern supernova remnants at 14–18 GHz*

Natasha Hurley-Walker, A. M. M. Scaife, D. A. Green, Matthew L. Davies, Keith Grainge, Michael P. Hobson, Michael E. Jones, Tak Kaneko, Anthony Lasenby, Guy Pooley, Richard D. E. Saunders, Paul F. Scott, David Titterington, Elizabeth Waldram and Jonathan T. L. Zwart

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 396, issue 1, pages 365-376
Published in print June 2009 | ISSN: 0035-8711
Published online June 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14583.x
AMI observations of northern supernova remnants at 14–18 GHz*

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We present observations between 14.2 and 17.9 GHz of 12 reported supernova remnants (SNRs) made with the Arcminute Microkelvin Imager Small Array (AMI SA). In conjunction with data from the literature at lower radio frequencies, we determine spectra of these objects. For well-studied SNRs (Cas A, Tycho's SNR, 3C 58 and the Crab Nebula), the results are in good agreement with spectra based on previous results. For the less well-studied remnants, the AMI SA observations provide higher-frequency radio observations than previously available, and better constrain their radio spectra. The AMI SA results confirm a spectral turnover at ≃11 GHz for the filled-centre remnant G74.9+1.2. We also see a possible steepening of the spectrum of the filled-centre remnant G54.1+0.3 within the AMI SA frequency band compared with lower frequencies. We confirm that G84.9+0.5, which had previously been identified as a SNR, is rather an H ii region and has a flat radio spectrum.

Keywords: radiation mechanisms: non-thermal; supernova remnants; radio continuum: ISM

Journal Article.  6801 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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