Journal Article

The structure of molecular gas associated with NGC 2264: wide-field <sup>12</sup>CO and H<sub>2</sub> imaging

J. V. Buckle, J. S. Richer and C. J. Davis

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 423, issue 2, pages 1127-1143
Published in print June 2012 | ISSN: 0035-8711
Published online June 2012 | e-ISSN: 1365-2966 | DOI:
The structure of molecular gas associated with NGC 2264: wide-field 12CO and H2 imaging

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We present wide-field, high-resolution imaging observations in 12CO 3 → 2 and H2 1–0 S(1) towards a ∼1 deg2 region of NGC 2264. We identify 46 H2 emission objects, of which 35 are new discoveries. We characterize several cores as protostellar, reducing the previously observed ratio of pre-stellar/protostellar cores in the NGC 2264 clusters. The length of H2 jets increases the previously reported spatial extent of the clusters. In each cluster, <0.5 per cent of cloud material has been perturbed by outflow activity. A principal component analysis of the 12CO data suggests that turbulence is driven on scales >2.6 pc, which is larger than the extent of the outflows. We obtain an exponent α= 0.74 for the size–linewidth relation, possibly due to the high surface density of NGC 2264. In this very active, mixed-mass star-forming region, our observations suggest that protostellar outflow activity is not injecting energy and momentum on a large enough scale to be the dominant source of turbulence.

Keywords: stars: formation; ISM: jets and outflows; infrared: ISM; submillimetre: ISM

Journal Article.  10910 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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