Small-scale NH3 clumping in M17

Details Small-scale NH3 clumping in M17 Small-scale NH3 clumping in M17

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...194..116m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 194, no. 1-2, April 1988, p. 116-124.

Astronomy and Astrophysics

Astrophysics

27

Ammonia, H Ii Regions, Interstellar Gas, Star Formation, Very Large Array (Vla), Water Masers, Gravitational Collapse, Stellar Structure

Scientific paper

The authors present VLA maps in the NH3 (1,1) line and in the H2O 22.3 GHz maser line of 2arcmin×2arcmin region centered on the ultra compact H II region M17-UC1. The maps have an angular resolution of ≡6arcsec, a velocity resolution of 1.2 km s-1 and cover a velocity range from 1.5 to 38.5 km s-1 for NH3 and from -22 to +62 km s-1 for H2O. Several NH3 clumps are detected in the maps of the six central channels, located 0.4 pc west of the arc shaped ionization front that separates the diffuse H II region from the molecular cloud. The hypothesis proposed is that the clumps and the more diffuse molecular gas around them both result from the collapse of a molecular blob of ≡300 M_sun;.

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