Collapse of self-gravitating protostellar condensations in DR 21

Details Collapse of self-gravitating protostellar condensations in DR 21 Collapse of self-gravitating protostellar condensations in DR 21

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...350..722k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 350, Feb. 20, 1990, p. 722-727.

Astronomy and Astrophysics

Astrophysics

5

Gravitational Collapse, H Ii Regions, Protostars, Star Formation, Stellar Mass Accretion, Ammonia, Angular Resolution, Molecular Clouds, Stellar Cores

Scientific paper

High angular resolution NH3 spectral line observations of the massive star-forming region DR 21 are reported. The observations resolve the velocity structure in two isolated dense clouds adjacent to the DR 21 cluster of ultracompact H II regions and show localized, spherically symmetric, radial flow in each case. The measured velocities of 2.5 km/s and 1.0 km/s, and the cloud masses of 270 and 20 solar masses, estimated from column density measurements, are consistent with infall generated by self-gravity. Thus these cores may represent molecular cloud condensations in the earliest stages of stellar evolution undergoing gravitational collapse and accretion just prior to the formation of massive stars.

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