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Astron. Astrophys. 355, 1122-1128 (2000)

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Dust emission from star-forming regions

VI. The submillimetre YSO cluster in NGC 2264

D. Ward-Thompson 1, R. Zylka 2,3, P.G. Mezger 2 and A.W. Sievers 4

1 Department of Physics & Astronomy, University of Wales Cardiff, P.O. Box 913, Cardiff, UK
2 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
3 Institut für Theoretische Astrophysik, Tiergartenstrasse 15, 69121 Heidelberg, Germany
4 IRAM, Avenida Divina Pastora 7, Nucleao Central, 18012 Granada, Spain

Received 13 August 1998 / Accepted 29 November 1999

Abstract

We present new submillimetre and millimetre continuum observations of NGC 2264, in the region of Allen's infra-red source IRS1, at 350, 450, 800 and 1300µm taken with the 15-m JCMT and the IRAM 30-m MRT. We observe a ridge of bright submillimetre and millimetre emission which we designate NGC 2264 MM. Within this ridge we have discovered a cluster of five submillimetre sources which we label NGC 2264 MMS1-5. The masses of the sources lie in the range [FORMULA]10-50[FORMULA] and each source has a FWHM of [FORMULA]0.1pc. The total mass of the ridge is [FORMULA]730[FORMULA].

We identify MMS3 as harbouring the driving source of a previously discovered bipolar outflow. We note that MMS5 is positionally coincident with a previously discovered HST near-ir source, but we conclude that this is a chance alignment, since typical extinction values within the ridge lie in the range AV[FORMULA]200-1600. The cluster which we have discovered is of higher mass and extends over a larger area than the low-mass sub-cluster discovered by the HST surrounding IRS1. Our continuum maps show a greater dynamic range than molecular spectral line maps, due to gas freezing out onto dust grains at the densities of these sources. We suggest that each of the sources MMS1-5 is forming one or more intermediate or high mass stars.

Key words: stars: formation – ISM: dust, extinction – Galaxy: open clusters and associations: individual: NGC 2264

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© European Southern Observatory (ESO) 2000

Online publication: March 21, 2000
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