Statistical Properties of Dense Molecular Cloud Clumps in the Galactic Center Region

Details Statistical Properties of Dense Molecular Cloud Clumps in the Galactic Center Region Statistical Properties of Dense Molecular Cloud Clumps in the Galactic Center Region

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..106m&link_type=abstract

Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam

Physics

Scientific paper

We report statistical properties of molecular cloud clumps from the Galactic center region survey in CS J=1-0 with the Nobeyama 45-m telescope (Tsuboi, Handa and Ukita 1999). We identified 130 molecular cloud clumps from the survey data (about 2 deg.2). We analyzed them and determined the following statistical properties; 1) the velocity width-radius relation; The velocity line widths of the Galactic center clumps are about five times larger than those of the Galactic disk clouds with the same radius. Δ V=(11.5 +/- 1.3) ṡ R0.50 +/- 0.08 2) the virial theorem mass-LTE mass relation; Most of the Galactic center clumps have a order of magnitude larger virial theorem masses than the LTE masses. 3) the mass and size spectra; Mass spectrum of the Galactic center molecular clumps is dN/dM propto M-1.6 +/- 0.1 (M >~ 1.2 +/- 104 sm).

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