Dust emission from star-forming regions. VI. The submillimetre YSO cluster in NGC 2264

Details Dust emission from star-forming regions. VI. The submillimetre YSO cluster in NGC 2264 Dust emission from star-forming regions. VI. The submillimetre YSO cluster in NGC 2264

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...355.1122w&link_type=abstract

Astronomy and Astrophysics, v.355, p.1122-1128 (2000)

Astronomy and Astrophysics

Astrophysics

27

Stars: Formation, Ism: Dust, Extinction, Galaxy: Open Clusters And Associations: Individual: Ngc 2264

Scientific paper

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 1300 μm 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 ~ 10-50M_sun and each source has a FWHM of <=0.1pc. The total mass of the ridge is ~ 730M_sun. 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 A_V ~ 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.

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