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21-cm Line Studies of the Galactic Center Region

Published online by Cambridge University Press:  14 August 2015

S. Christian Simonson III
S. Christian Simonson III*
Affiliation:
University of Maryland, College Park, Md., U.S.A.

Abstract

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Features of the 21-cm line radiation that have often been attributed to the galactic center or to activity there include, near the equator, the ‘3-kpc arm’, the ‘expanding arms’ at +70 and + 135 km s+1, and the ‘nuclear disk’, and, away from the equator, features observed by Cugnon, by Shane, by van der Kruit, and by Sanders, Wrixon, and Penzias, among others. Models of the features in the equatorial plane are discussed on the basis of the form of the Tb(l, V) contours that they generate. Both explosions in the nucleus and resonance with a spiral wave have been suggested as the cause of the 3-kpc arm and related features. Some of the models put limits on the mass distribution, particularly the amount of condensed mass at the center. Higher-latitude features have been less thoroughly modeled, but explosions in the nucleus and resonant orbits have also been suggested for their origins.

Type
Part 5: The Galactic Center
Information
Symposium - International Astronomical Union , Volume 60: Galactic Radio Astronomy , 1974 , pp. 511 - 519
Copyright
Copyright © Reidel 1974 

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