High-resolution H I observations of H II regions. III - Photodissociation regions and the magnetic field near Orion B

Details High-resolution H I observations of H II regions. III - Photodissociation regions and the magnetic field near Orion B High-resolution H I observations of H II regions. III - Photodissociation regions and the magnetic field near Orion B

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...411..247v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 411, no. 1, p. 247-259.

Astronomy and Astrophysics

Astrophysics

14

H Ii Regions, Hydrogen, Interstellar Magnetic Fields, Interstellar Matter, Molecular Clouds, Orion Constellation, Photodissociation, Angular Resolution, Circular Polarization, High Resolution, Line Of Sight, Zeeman Effect

Scientific paper

Results are presented of H I 1420 MHz observations of the H II region Orion B, carried out with the VLA of NRAO in the D-configuration. Three kinematically distinct H I layers are detected in absorption, and it is argued that one of these components originates in a photodissociation region (PDR) directly outside the ionization front in front of the H II region. In addition to the H I absorption, H I emission is detected, believed to originate in a PDR behind the H II region. The results are interpreted in terms of a clumby PDR model where the colder gas is located in dense clumps embedded in a warmer, low-density interclump medium. An analysis of the Zeeman effect indicated that the magnetic field strength and the total pressure in the dense PDR are higher than in the more tenuous cloud envelope. However, in the cloud envelope, the pressure is dominated by the magnetic field, while turbulent pressure dominates in the PDR.

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