Journal Article

AMI-LA radio continuum observations of <i>Spitzer</i> c2d small clouds and cores: Serpens region*

Anna M. M. Scaife, Jennifer Hatchell, Rachael E. Ainsworth, Jane V. Buckle, Matthew Davies, Thomas M. O. Franzen, Keith J. B. Grainge, Michael P. Hobson, Natasha Hurley-Walker, Anthony N. Lasenby, Malak Olamaie, Yvette C. Perrott, Guy G. Pooley, John S. Richer, Carmen Rodríguez-Gonzálvez, Richard D. E. Saunders, Michel P. Schammel, Paul F. Scott, Timothy Shimwell, David Titterington and Elizabeth Waldram

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 420, issue 2, pages 1019-1033
Published in print February 2012 | ISSN: 0035-8711
Published online January 2012 | e-ISSN: 1365-2966 | DOI:
AMI-LA radio continuum observations of Spitzer c2d small clouds and cores: Serpens region*

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We present deep radio continuum observations of the cores identified as deeply embedded young stellar objects in the Serpens molecular cloud by the Spitzer c2d programme at a wavelength of 1.8 cm with the Arcminute Microkelvin Imager Large Array (AMI-LA). These observations have a resolution of ≈ 30 arcsec and an average sensitivity of 19 μJy beam−1. The targets are predominantly Class I sources, and we find the detection rate for Class I objects in this sample to be low (18 per cent) compared to that of Class 0 objects (67 per cent), consistent with previous works. For detected objects we examine correlations of radio luminosity with bolometric luminosity and envelope mass and find that these data support correlations found by previous samples, but do not show any indication of the evolutionary divide hinted at by similar data from the Perseus molecular cloud when comparing radio luminosity with envelope mass. We conclude that envelope mass provides a better indicator for radio luminosity than bolometric luminosity, based on the distribution of deviations from the two correlations. Combining these new data with archival 3.6 cm flux densities we also examine the spectral indices of these objects and find an average spectral index of , consistent with the canonical value for a partially optically thick spherical or collimated stellar wind. However, we caution that possible inter-epoch variability limits the usefulness of this value, and such variability is supported by our identification of a possible flare in the radio history of Serpens SMM 1.

Keywords: radiation mechanisms: general; stars: formation; ISM: clouds; ISM: general

Journal Article.  11308 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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