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23 April 2024

» arxiv » 1412.5965

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The JCMT Gould Belt Survey: Evidence for radiative heating in Serpens MWC 297 and its influence on local star formation
D. Rumble ; J. Hatchell ; R.A. Gutermuth ; H. Kirk ; J. Buckle ; S.F. Beaulieu ; D.S. Berry ; H. Broekhoven-Fiene ; M.J. Currie ; M. Fich ; T. Jenness ; D. Johnstone ; J.C. Mottram ; D. Nutter ; K. Pattle ; J.E. Pineda ; C. Quinn ; C. Salji ; S. Tisi ; S. Walker-Smith ; J. Di Francesco ; M.R. Hogerheijde ; D. Ward-Thompson ; L.E. Allen ; L.A. Cieza ; M.M. Dunham ; P.M. Harvey ; K.R. Stapelfeldt ; P. Bastien ; H. Butner ; M. Chen ; A. Chrysostomou ; S. Coude ; C.J. Davis ; E. Drabek-Maunder ; A. Duarte-Cabral ; J. Fiege ; P. Friberg ; R. Friesen ; G.A. Fuller ; S. Graves ; J. Greaves ; J. Gregson ; W. Holland ; G. Joncas ; J.M. Kirk ; L.B.G. Knee ; S. Mairs ; K. Marsh ; B.C. Matthews ; G. Moriarty-Schieven ; J. Rawlings ; J. Richer ; D. Robertson ; E. Rosolowsky ; S. Sadavoy ; H. Thomas ; N. Tothill ; S. Viti ; G.J. White ; C.D. Wilson ; J. Wouterloot ; J. Yates ; M. Zhu ;
Date:	18 Dec 2014
Abstract:	We present SCUBA-2 450mu m and 850mu m observations of the Serpens MWC 297 region, part of the JCMT Gould Belt Survey of nearby star-forming regions. Simulations suggest that radiative feedback influences the star-formation process and we investigate observational evidence for this by constructing temperature maps. Maps are derived from the ratio of SCUBA-2 fluxes and a two component model of the JCMT beam for a fixed dust opacity spectral index of beta = 1.8. Within 40 of the B1.5Ve Herbig star MWC 297, the submillimetre fluxes are contaminated by free-free emission with a spectral index of 1.03pm0.02, consistent with an ultra-compact HII region and polar winds/jets. Contamination accounts for 73pm5 per cent and 82pm4 per cent of peak flux at 450mu m and 850mu m respectively. The residual thermal disk of the star is almost undetectable at these wavelengths. Young Stellar Objects are confirmed where SCUBA-2 850mu m clumps identified by the fellwalker algorithm coincide with Spitzer Gould Belt Survey detections. We identify 23 objects and use Tbol to classify nine YSOs with masses 0.09 to 5.1 Modot. We find two Class 0, one Class 0/I, three Class I and three Class II sources. The mean temperature is 15pm2K for the nine YSOs and 32pm4K for the 14 starless clumps. We observe a starless clump with an abnormally high mean temperature of 46pm2K and conclude that it is radiatively heated by the star MWC 297. Jeans stability provides evidence that radiative heating by the star MWC 297 may be suppressing clump collapse.
Source:	arXiv, 1412.5965
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