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Title:
A synoptic view of the galaxy in HI
Authors:
Cleary, M. N.; Haslam, C. G. T.; Heiles, C.
Affiliation:
AA(Mt. Stromlo and Siding Spring Observatory; Australian National University, Canberra, Australia), AB(Max-Planck-Institut fuer Radioastronomie, Bonn, West Germany)
Publication:
Astronomy and Astrophysics, Supplement Series, vol. 36, Apr. 1979, p. 95-127. NSF-supported research. (A&AS Homepage)
Publication Date:
04/1979
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
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
Comment:
A&AA ID. AAA025.155.015
Bibliographic Code:
1979A&AS...36...95C

Abstract

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.

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