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AMI radio continuum observations of young stellar objects with known outflows

Ainsworth, Rachel E. and Scaife, Anna M. M. and Ray, Tom P. and Buckley, Jane V. and Davies, Matthew and Franzen, Thomas M. O. and Grainge, Keith J. B. and Hobson, Michael P. and Hurley-Walker, Natasha and Lasenby, Anthony N. and Olamaie, Malak and Perrott, Yvette C. and Pooley, Guy G. and Richer, John S. and Rodríguez-Gonzálvez, Carmen and Saunders, Richard D. E. and Schammel, Michel P. and Scott, Paul F. and Shimwell, Timothy and Titterington, David and Waldram, Elizabeth (2012) AMI radio continuum observations of young stellar objects with known outflows. Monthly Notices of the Royal Astronomical Society, 423 (2). pp. 1089-1108. ISSN 0035-8711. doi:10.1111/j.1365-2966.2012.20935.x.

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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 (T_d) according to evolutionary class; and (2) allowing T_d 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 free–free emission. We find an average spectral index in both T_d scenarios, consistent with free–free 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, β. 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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Hurley-Walker, Natasha0000-0002-5119-4808
Additional Information:© 2012 The Authors. Monthly Notices of the Royal Astronomical Society © 2012 RAS. Accepted 2012 March 15. Received 2012 March 14; in original form 2012 February 10. Article first published online: 21 May 2012. We thank the staff of the Lord’s Bridge Observatory for their invaluable assistance in the commissioning and operation of the AMI. The AMI is supported by Cambridge University and the STFC. We thank the anonymous referee for their careful and constructive reading of our paper. RA would like to acknowledge support from Science Foundation Ireland under grant 11/RFP/AST3331.
Funding AgencyGrant Number
Cambridge UniversityUNSPECIFIED
Science Foundation Ireland11/RFP/AST3331
Subject Keywords:radiation mechanisms: general, stars: formation, ISM: clouds, ISM: general.
Issue or Number:2
Record Number:CaltechAUTHORS:20120710-081026085
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Official Citation:AMI Consortium, Ainsworth, R. E., Scaife, A. M. M., Ray, T. P., Buckle, J. V., Davies, M., Franzen, T. M. O., Grainge, K. J. B., Hobson, M. P., Hurley-Walker, N., Lasenby, A. N., Olamaie, M., Perrott, Y. C., Pooley, G. G., Richer, J. S., Rodríguez-Gonzálvez, C., Saunders, R. D. E., Schammel, M. P., Scott, P. F., Shimwell, T., Titterington, D. and Waldram, E. (2012), AMI radio continuum observations of young stellar objects with known outflows. Monthly Notices of the Royal Astronomical Society, 423: 1089–1108. doi: 10.1111/j.1365-2966.2012.20935.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32316
Deposited By: Ruth Sustaita
Deposited On:10 Jul 2012 16:16
Last Modified:09 Nov 2021 21:26

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