Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397..165j&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 397, no. 1, p. 165-173.
Astronomy and Astrophysics
Astronomy
40
Far Infrared Radiation, H I Regions, Infrared Astronomy Satellite, Interstellar Matter, Sky Surveys (Astronomy), Astronomical Spectroscopy, Carbon Monoxide, High Resolution, Molecular Clouds
Scientific paper
High-resolution H I observations of part of an IR cirrus in Ursa Major are discussed. The atomic hydrogen component presents an intricate morphology and velocity field. The H I feature is made up of interconnecting filaments and condensations the majority of which have an east-west alignment. Two filaments extrude perpendicularly from the main body of the feature. The vast majority of the H I spectra have multiple components with FWHM of the order of 3-5 km/s. The velocity dispersions are about equal to the Alfven speed. The turbulent and magnetic pressures are the main forces acting on the H I gas. In IR maps, the atomic cloud appears spatially connected to a molecular cloud with a gas density one order of magnitude larger and a turbulent energy one order of magnitude smaller. The association and the location of the whole object within a large H I loops suggests that a molecular cloud is being formed or disrupted.
Boulanger Francois
Dewdney Peter E.
Joncas Gilles
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