ALMA observations of 99 GHz free-free and H40α line emission from star formation in the centre of NGC 253

George Bendo, Robert Beswick, M J D'Cruze, C Dickinson, Gary Fuller, Thomas Muxlow

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We present Atacama Large Millimeter/submillimeter Array observations of 99.02 GHz free-free and H40α emission from the centre of the nearby starburst galaxy NGC 253. We calculate electron temperatures of 3700-4500 K for the photoionized gas, which agrees with previous measurements. We measure a photoionizing photon production rate of (3.2 ± 0.2) × 1053 s-1 and a star formation rate of 1.73 ± 0.12 M⊙ yr-1 within the central 20 × 10 arcsec, which fall within the broad range of measurements from previous millimetre and radio observations but which are better constrained. We also demonstrate that the dust opacities are ˜3 dex higher than inferred from previous near-infrared data, which illustrates the benefits of using millimetre star formation tracers in very dusty sources.
    Original languageEnglish
    Pages (from-to)L80-L84
    JournalMonthly Notices of the Royal Astronomical Society
    Volume450
    Publication statusPublished - 2015

    Keywords

    • galaxies: individual: NGC 253
    • galaxies: starburst
    • radio continuum: galaxies
    • radio lines: galaxies

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