The extinction to the H2 line emission in the DR 21 outflow source

Details The extinction to the H2 line emission in the DR 21 outflow source The extinction to the H2 line emission in the DR 21 outflow source

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...372l.103n&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 372, May 10, 1991, p. L103-L106. NSERC-supported research.

Astronomy and Astrophysics

Astronomy

6

Emission Spectra, H Lines, Infrared Astronomy, Nebulae, Star Formation, Infrared Telescopes, Molecular Clouds

Scientific paper

The v = 1-0 S(1) and Q(3) lines of H2 have been measured in four regions of the DR 21 H2 line-emission source, in order to determine whether the observed morphology of the emission represents the distribution of the excited H2 or is modified by nonuniform extinction across the source. The measured lines originate from the same upper level, and their ratio is a direct measure of the reddening. The line ratios show that the extinction is quite uniform across the source and that there is no correlation between the intensity and the extinction. This result implies that the gap between the two lobes of emission is not due to increased extinction but rather is a region where there is little excited H2 gas.

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