A spectroscopic study of the DR 21 outflow source. II - The vibrational H2 line emission

Details A spectroscopic study of the DR 21 outflow source. II - The vibrational H2 line emission A spectroscopic study of the DR 21 outflow source. II - The vibrational H2 line emission

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...366..474g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 366, Jan. 10, 1991, p. 474-483.

Astronomy and Astrophysics

Astrophysics

32

H Lines, Interstellar Gas, Molecular Clouds, Nebulae, Pre-Main Sequence Stars, Astronomical Spectroscopy, Hydrogen Clouds, Interstellar Extinction

Scientific paper

Large-scale mapping and high-spectral-resolution profile measurements of the vibrational H2 v = 1-0 S(1) line are used to investigate the morphology and kinematic structure of the hot, shocked gas associated with the ultraluminous DR 21 young-stellar outflow. It is found that the H2 line profiles at certain locations within the outflow possess high-velocity wings which extend to beyond 100 km/s from the DR 21 rest velocity. It is argued that the jets, which shock the surrounding molecular cloud medium and produce the bright H2-line emission, are composed primarily of hot atomic gas which is confined by the thermal pressure of the ambient cloud medium.

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