Radial motions of molecular gas in the W49 cloud core

Details Radial motions of molecular gas in the W49 cloud core Radial motions of molecular gas in the W49 cloud core

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...429l..37j&link_type=abstract

The Astrophysical Journal, vol. 429, no. 1, pt. 2, p. L37-L39

Astronomy and Astrophysics

Astronomy

7

Absorption Spectra, Ammonia, Astrodynamics, B Stars, Emission Spectra, Interstellar Gas, Molecular Clouds, O Stars, Radio Astronomy, Star Formation, Gravitational Collapse, Hyperfine Structure, Very Large Array (Vla)

Scientific paper

We have imaged NH3 (3, 3) emission and absorption toward the star-forming region W49 with the VLA at 4 sec resolution. We find warm, dense molecular gas associated with the ring of newly formed OB stars. Although the NH3 hyperfine line strengths indicate optically thick absorption, only approximately 25% of the continuum is absorbed. Therefore, either the molecular gas or the continuum emission is clumped on approximately 0.1 pc scales. The NH3 velocity field reveals systematic radial motions. These motions are most likely directed inward toward the ring's center. The infall velocities, approximately 10 km per sec, are consistent with parsec-scale gravitational collapse toward a 2 x 104 solar mass cloud core.

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