VLA observations of H2 in DR 21

Details VLA observations of H2 in DR 21 VLA observations of H2 in DR 21

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...120...74d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 120, no. 1, April 1983, p. 74-84.

Astronomy and Astrophysics

Astronomy

26

Formaldehyde, Molecular Absorption, Molecular Clouds, Radio Sources (Astronomy), Absorption Spectra, Astronomical Maps, Centimeter Waves, Continuous Spectra, Gas Density, H Ii Regions, Optical Thickness, Radial Velocity, Very Large Array (Vla)

Scientific paper

The Very Large Array has been used to map the H2CO absorption at 6 cm from the molecular gas ahead of the radio continuum source DR 21. Three main velocity components are seen: weak absorption attributable to overlying low density molecular gas unassociated with DR 21's individual, compact H II regions; deep absorption centered at about -2.4 km/sec, which appears to be associated with the compact H II region C; and a component covering a narrow velocity range and showing up as a long, narrow band of absorption centered just north of the continuum maxima C and A. Comparison of the distributions of H2CO and other molecules indicates that all absorptions are strongest in the southern part of DR 21, especially near H II region C.

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