A Dusty ring in the Coalsack: A dense core caught in the act of formation?

Details A Dusty ring in the Coalsack: A dense core caught in the act of formation? A Dusty ring in the Coalsack: A dense core caught in the act of formation?

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006atnf.prop...71l&link_type=abstract

ATNF proposal M166, Semester: April, 2006

Computer Science

Galactic, Mopra

Scientific paper

We propose to obtain molecular line maps of the most opaque molecular globule in the Coalsack complex, G2. Using deep near-IR observations, we have discovered a strong central ring of dust column density within the globule. This ring represents a region of high density and pressure that is likely a transient structure. A single SEST C18O (2-1) spectrum toward the center of the ring reveals a complex line profile that most likely results from turbulence. We suggest that the dense ring is in the process of transforming into a more centrally condensed state, similar to that of typical Bok globules and dense star-forming cores. We propose to use Mopra to obtain a C18O (1-0) map across the dense ring and a 13CO (1-0) map of the surrounding lower-density envelope. The spatial variation of the C18O linewidths across the ring, will reveal whether or not the dense ring is indeed in a very early evolutionary stage of star formation.

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