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    AMI radio continuum observations of young stellar objects with known outflows

    245646_245646.pdf (4.000Mb)
    Access Status
    Open access
    Authors
    Ainsworth, R.
    Scaife, A.
    Ray, T.
    Buckle, J.
    Davies, M.
    Frantzen, T.
    Grainge, K.
    Hobson, M.
    Hurley-Walker, Natasha
    Lasenby, A.
    Olamaie, M.
    Perrott, Y.
    Pooley, G.
    Richer, J.
    Rodriguez-Gonzalvez, C.
    Saunders, R.
    Schammel, M.
    Scott, P.
    Shimwell, T.
    Titterington, D.
    Waldram, E.
    Date
    2012
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Ainsworth, R. and Scaife, A. and Ray, T. and Buckle, J. and Davies, M. and Frantzen, T. and Grainge, K. et al. 2012. AMI radio continuum observations of young stellar objects with known outflows. Monthly Notices of the Royal Astronomical Society. 423 (2): pp. 1089-1108.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1111/j.1365-2966.2012.20935.x
    ISSN
    0035-8711
    School
    Curtin Institute of Radio Astronomy (Physics)
    Remarks

    Copyright © 2012 The Authors. Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/5078
    Collection
    • Curtin Research Publications
    Abstract

    We present 16 GHz (1.9 cm) deep radio continuum observations made with the Arcminute Microkelvin Imager (AMI) of a sample of low-mass young stars driving jets. We combine these new data with archival information from an extensive literature search to examine spectral energy distributions (SEDs) for each source and calculate both the radio and sub-mm spectral indices in two different scenarios: (1) fixing the dust temperature (Td) according to evolutionary class; and (2) allowing Td to vary. We use the results of this analysis to place constraints on the physical mechanisms responsible for the radio emission. From AMI data alone, as well as from model fitting to the full SED in both scenarios, we find that 80 per cent of the objects in this sample have spectral indices consistent with freefree emission. We find an average spectral index in both Td scenarios, consistent with freefree emission. We examine correlations of the radio luminosity with bolometric luminosity, envelope mass and outflow force, and find that these data are consistent with the strong correlation with envelope mass seen in lower luminosity samples. We examine the errors associated with determining the radio luminosity and find that the dominant source of error is the uncertainty on the opacity index, beta. We examine the SEDs for variability in these young objects, and find evidence for possible radio flare events in the histories of L1551 IRS 5 and Serpens SMM 1.

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