AMI limits on 15-GHz excess emission in northern H II regions

A. M M Scaife, N. Hurley-Walker, M. L. Davies, P. J. Duffett-Smith, F. Feroz, K. J B Grainge, D. A. Green, M. P. Hobson, T. Kaneko, A. N. Lasenby, G. G. Pooley, R. D E Saunders, P. F. Scott, D. J. Titterington, E. M. Waldram, J. Zwart

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We present observations between 14.2 and 17.9 GHz of 16 Galactic H ii regions made with the Arcminute Microkelvin Imager. In conjunction with data from the literature at lower radio frequencies we investigate the possibility of a spinning dust component in the spectra of these objects. We conclude that there is no significant evidence for spinning dust towards these sources and measure an average spectral index of α = 0.15 ± 0.07 (where S ∝ ν-α) between 1.4 and 17.9 GHz for the sample. © 2008 RAS.
    Original languageEnglish
    Pages (from-to)809-822
    Number of pages13
    JournalMonthly Notices of the Royal Astronomical Society
    Volume385
    Issue number2
    DOIs
    Publication statusPublished - Apr 2008

    Keywords

    • H II regions
    • ISM: clouds
    • Radiation mechanisms: thermal
    • Radio continuum: ISM

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