Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26as...36...95c&link_type=abstract
Astronomy and Astrophysics, Supplement Series, vol. 36, Apr. 1979, p. 95-127. NSF-supported research.
Astronomy and Astrophysics
Astrophysics
95
Galactic Structure, Gas Density, Hydrogen Clouds, Interstellar Gas, Interstellar Matter, Density Distribution, Hydrogen Atoms, Least Squares Method, Optical Polarization, Photographs, Southern Hemisphere, Velocity Distribution, X Ray Spectra
Scientific paper
Results are presented for a southern-sky H I survey south of declination -30 deg, excluding a previously surveyed strip bounded by absolute values of galactic latitude less than 10 deg. These results are combined with those of Heiles and Habing (1974) to produce total sky maps of the H I distribution outside the previously surveyed strip for the velocity range from -90 to +70 km/s. It is found that: (1) the filamentary structure previously observed in the northern hemisphere is also observed in the southern hemisphere; (2) the low-velocity H I filament previously detected in the southern hemisphere is correlated with optical and radio polarization and may be part of the low-velocity bubble expanding from the center of the Sco-Cen association; (3) a ring of negative-velocity gas is located at the south galactic pole; (4) the overall distribution of the intermediate-velocity gas is governed by differential rotation; and (5) a concentration of positive-velocity H I, which is interpreted as a high-latitude extension of a spiral arm, is located in the region of the Gum Nebula.
Cleary M. N.
Haslam G. T. C.
Heiles Carl
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