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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 

References

Burton, W. B.: 1970, Astron. Astrophys. Suppl. 2, 261.Google Scholar
Cugnon, P.: 1968, Bull. Astron. Inst. Neth. 19, 363.Google Scholar
Davies, R. D. and Cohen, R. J.: 1973, private communication.Google Scholar
Kerr, F. J.: 1969, Australian J. Phys. Astrophys. Suppl., No. 9, 1.Google Scholar
Kerr, F. J. and Hindman, J. V.: 1970, Australian J. Phys. Astrophys. Suppl., No. 18, 1.Google Scholar
Kerr, F. J. and Sinclair, M. W.: 1966, Nature 212, 166.Google Scholar
Kerr, F. J. and Vallak, R.: 1967. Australian J. Phys. Astrophys. Suppl., No. 3, 1.Google Scholar
Kerr, F. J., Harten, R. H., and Ball, D. L.: 1973, Astron. Astrophys. Suppl., in preparation.Google Scholar
Kruit, P. C. van der: 1970, Astron. Astrophys. 4, 262.Google Scholar
Kruit, P. C. van der: 1971, Astron. Astrophys. 13, 405.Google Scholar
Lindblad, P. O.: 1974, Astron. Astrophys. Suppl. 16, 207.Google Scholar
Lynden-Bell, D. and Rees, M.: 1971, Monthly Notices Roy. Astron. Soc. 152, 461.Google Scholar
Menon, T. K. and Ciotti, J. E.: 1970, Nature 227, 579.Google Scholar
Rougoor, G. W.: 1964, Bull. Astron. Inst. Neth. 17, 381.Google Scholar
Sanders, R. H. and Prendergast, K. H.: 1974, Astrophys. J. 188, 489.Google Scholar
Sanders, R. H. and Wrixon, G. T.: 1972a, Astron. Astrophys. 18, 92.Google Scholar
Sanders, R. H. and Wrixon, G. T.: 1972b, Astron. Astrophys. 18, 467.Google Scholar
Sanders, R. H. and Wrixon, G. T.: 1973, Astron. Astrophys. 26, 365.Google Scholar
Sanders, R. H., Wrixon, G. T., and Penzias, A. A.: 1972, Astron. Astrophys. 16, 322.Google Scholar
Sandqvist, Aa.: 1973, Astron. Astrophys. Suppl. 9, 381.Google Scholar
Shane, W. W.: 1972, Astron. Astrophys. 16, 118.Google Scholar
Simonson, S. C. and Mader, G. L.: 1973, Astron. Astrophys. 27, 337.Google Scholar
Simonson, S. C. and Sancisi, R.: 1973, Astron. Astrophys. Suppl. 10, 283.Google Scholar
Weaver, H. and Williams, D. R. W.: 1973, Astron. Astrophys. Suppl. 8, 1.Google Scholar
Westerhout, G.: 1973, Maryland-Green Bank Galactic 21-cm Line Survey, 3rd edn., Univ. of Maryland, College Park, Maryland.Google Scholar
Wrixon, G. T. and Sanders, R. H.: 1973, Astron. Astrophys. Suppl. 11, 339.Google Scholar