High resolution H I observations of dark clouds. I - L134

Details High resolution H I observations of dark clouds. I - L134 High resolution H I observations of dark clouds. I - L134

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...201..311v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 201, no. 2, Aug. 1988, p. 311-326. ZWO-supported research.

Astronomy and Astrophysics

Astrophysics

31

Dark Matter, H Lines, Hydrogen Clouds, Interstellar Gas, Molecular Clouds, Radio Spectra, Spectrum Analysis, Spin Temperature, Velocity Distribution

Scientific paper

H I line observations of the dark cloud L134 are presented, obtained with the VLA in the D-configuration. The resulting maps have an angular resolution (after smoothing) of 100" and a velocity resolution of 0.64 km s-1. Two of the velocity components detected in the H I spectra correspond to the components A and B at velocities of 2.7 and 0.7 km s-1, that were known from previous studies. It is not certain whether the newly detected component C is real and, if so, related to L134. The observed H I abundances can be explained by a model involving cosmic ray dissociation in the cloud core, and photodissociation by an anisotropic radiation field in the envelope. It is concluded that cosmic ray heating is the dominant heating process in the dark core.

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