The Contracting Molecular Cores e1 and e2 in W51

Details The Contracting Molecular Cores e1 and e2 in W51 The Contracting Molecular Cores e1 and e2 in W51

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...472..742h&link_type=abstract

Astrophysical Journal v.472, p.742

Astronomy and Astrophysics

Astronomy

30

Ism: Individual Alphanumeric: W51, Ism: Kinematics And Dynamics, Radio Lines: Ism

Scientific paper

We report on observations of the star-forming region W51 in the NH3(J, K) = (1, 1) and (2, 2) transitions at 1.3 cm. These observations have much greater sensitivity than our previous observations and they allow a kinematic analysis of the motions of the gas in two small star-forming cores. We present evidence for radial contraction of the gas in W51 e2 onto a young star and possibly also for similar contraction near W51 e1. The H II region/molecular core W51 e2 seems to be in a stage where the central star has already arrived on the main sequence, whereas the cooler gas on scales of 0.1-0.2 pc is still contracting onto the mass concentration at the center. In contrast to the interpretation of Rudolph et al., we propose that the contraction extends only over a few tenths of a parsec near e2 instead of over the entire W51 molecular cloud complex.

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