An almost complete survey of 21-cm line radiation for galactic latitudes of 10 deg and higher. V - Photographic presentation and qualitative comparison with other data

Details An almost complete survey of 21-cm line radiation for galactic latitudes of 10 deg and higher. V - Photographic presentation and qualitative comparison with other data An almost complete survey of 21-cm line radiation for galactic latitudes of 10 deg and higher. V - Photographic presentation and qualitative comparison with other data

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....46..333h&link_type=abstract

Astronomy and Astrophysics, vol. 46, no. 3, Feb. 1976, p. 333-360. NSF-supported research.

Astronomy and Astrophysics

Astronomy

100

Galactic Structure, Hydrogen Clouds, Interstellar Matter, Microwave Emission, Radio Astronomy, Astronomical Photography, Extraterrestrial Radio Waves, Hydrogen Atoms, Photogrammetry

Scientific paper

Color and black and white photographs are presented which were synthesized from a 21-cm H I survey and which show the distribution of low-velocity as well as positive and negative intermediate-velocity gas at galactic latitudes of 10 deg and higher. The basic character of the H I distribution is discussed, and the data are compared with observations of Ly-alpha absorption, interstellar polarization and extinction, bright and dark nebulae, and LF radio continuum emission. The following observations and conclusions are made: (1) most H I 'clouds' in all velocity ranges appear to be highly elongated and are best described as filaments, (2) the clouds in the region above +10 deg latitude and from 250 to 330 deg longitude appear to be colliding, (3) the previously proposed tilted disk of local gas (the 'Scheve Shijf') does not exist, (4) the H I filaments are aligned with the optical polarization of starlight, (5) the H I distribution is roughly correlated with interstellar extinction, and (6) bright nebulae tend to occur in regions exhibiting H I.

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