The Gould's Belt Very Large Array Survey. II. The Serpens Region

Abstract

We present deep (~17 μJy) radio continuum observations of the Serpens molecular cloud, the Serpens south cluster, and the W40 region obtained using the Very Large Array in its A configuration. We detect a total of 146 sources, 29 of which are young stellar objects (YSOs), 2 of which are BV stars, and 5 more of which are associated with phenomena related to YSOs. Based on their radio variability and spectral index, we propose that about 16 of the remaining 110 unclassified sources are also YSOs. For approximately 65% of the known YSOs detected here as radio sources, the emission is most likely non-thermal and related to stellar coronal activity. As also recently observed in Ophiuchus, our sample of YSOs with X-ray counterparts lies below the fiducial Güdel & Benz relation. Finally, we analyze the proper motions of nine sources in the W40 region. This allows us to better constrain the membership of the radio sources in the region.

Additional Information

© 2015 The American Astronomical Society. Received 2014 January 27; accepted 2015 March 12; published 2015 May 13. This work is supported by CONACyT, Mexico, and PAPIIT, UNAM. We thank M. Dunham and L. Allen for providing us with a list of known young stellar objects in the c2d-GB clouds prior to publication, and A. J. Maury for providing data of the Serpens South cluster. The National Radio Astronomy Observatory is operated by Associated Universities, Inc., under cooperative agreement with the National Science Foundation.

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Published - 0004-637X_805_1_9.pdf

Submitted - 1503.03904v2.pdf

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