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Ring and Lens Formation

Published online by Cambridge University Press:  12 April 2016

Françoise Combes
Françoise Combes*
Affiliation:
DEMIRM, Observatoire de Paris, 61 Av. de l’Observatoire, F-75014, Paris

Abstract

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The dynamical mechanism to form rings at Lindblad resonances in a barred galaxy is now well-known: due to its dissipative character, the gas is forced in a spiral structure, and experiences torques from the bar potential. Angular momentum is transferred until gas accumulates in the resonant rings. Some problems remain however to account for all observations, such as the very different time-scales for nuclear, inner and outer ring formation, while the three are frequently observed in the same galaxy; the shapes, orientations and thickness of the rings, etc... The adequacy of the present gas dynamical modelizations is discussed.

Lenses are secondary components of barred galaxies that could originate from bar evolution. No model until now has met the observational constraints, in particular the sharp edge of the lenses, their strong velocity anisotropy, and their small thickness. We propose here that lenses are the result of partial bar destruction, a necessary step in a feedback cycle of bar formation-destruction, a cycle driven by gas accretion.

Type
Part V. Theory of Barred Galaxies I.
Information
International Astronomical Union Colloquium , Volume 157: Barred Galaxies , 1996 , pp. 286 - 298
Copyright
Copyright © Astronomical Society of the Pacific 1996

References

Athanassoula, E. 1983, in Internal Kinematics and Dynamics of Galaxies”, Athanassoula, E., Dordrecht: Reidel, 243 Google Scholar
Athanassoula, E. 1992, MNRAS, 259, 345 CrossRefGoogle Scholar
Athanassoula, E., Bosma, A., Créze, M., & Schwarz, M.P. 1982, A&A, 107, 101 Google Scholar
Bosma, A. 1983, in Internal Kinematics and Dynamics of Galaxies, Athanassoula, E., Dordrecht: Reidel, 253 Google Scholar
Burton, W.B. 1992, in The Galactic Interstellar Medium, Pfenniger, D. & Bartholdi, P., New York: Springer-Verlag, 1 Google Scholar
Burstein, D. 1979, ApJ, 234, 829 CrossRefGoogle Scholar
Buta, R. 1986, ApJS, 61, 631 CrossRefGoogle Scholar
Buta, R. 1992 in Morphological and Physical Classification of Galaxies, Longo, G., Capaccioli, M., & Busarello, G., Dordrecht: Kluwer, 1 Google Scholar
Buta, R. & Crocker, D.A. 1991, AJ, 102, 1715 Google Scholar
Buta, R. & Crocker, D.A. 1993, AJ, 105, 1344 Google Scholar
Buta, R. & Combes, F. 1995, Fund. Cosmic Physics, in preparationGoogle Scholar
Byrd, G., Rautiainen, P., Salo, H., Buta, R., & Crocker, D.A. 1994, AJ, 108, 476 Google Scholar
Casoli, F. & Combes, F. 1982, A&A, 110, 287 Google Scholar
Combes, F. & Gerin, M. 1985, A&A, 150, 327 Google Scholar
Combes, F., Debbasch, F., Friedli, D., & Pfenniger, D. 1990, A&A, 233, 82 Google Scholar
Combes, F. 1993, in N-body Problems and Gravitational Dynamics, Combes, F. & Athanassoula, E., Paris: Paris Observatory, 137 Google Scholar
Combes, F. 1994, in Mass-Transfer Induced Activity in Galaxies, Shlosman, I., Cambridge: Cambridge Univ. Press, 170 CrossRefGoogle Scholar
Contopoulos, G. & Grosbol, P. 1989, A&AR 1, 261 Google Scholar
Contopoulos, G., Gottesman, S.T., Hunter, J.H., & England, M.N. 1989, ApJ, 343, 608 CrossRefGoogle Scholar
Cowie, L.L. 1980, ApJ, 236, 868 Google Scholar
Falgarone, E., Puget, J.-L., & Perault, M. 1992, A&A, 257, 715 Google Scholar
Freeman, K.C. 1975, in Dynamics of Stellar Systems, Hayli, A., Dordrecht: Kluwer, 367 Google Scholar
Friedli, D. & Benz, W. 1993 A&A, 268, 65 Google Scholar
Friedli, D. & Martinet, L. 1993, A&A, 277, 27 Google Scholar
Hasan, H. & Norman, C. 1990, ApJ, 361, 69 Google Scholar
Hasan, H., Pfenniger, D., & Norman, C. 1993, ApJ, 409, 91 Google Scholar
Heller, C.H. & Shlosman, I. 1994, ApJ, 424, 84 Google Scholar
Junqueira, S. & Combes, F. 1995, A&A, in preparationGoogle Scholar
Kalnajs, A.J. 1976, ApJ, 205, 745 Google Scholar
Kormendy, J. 1977, ApJ, 214, 359(lenses)Google Scholar
Kormendy, J. 1979, ApJ, 227, 714 Google Scholar
Kormendy, J. 1982a, in Morphology and Dynamics of Galaxies, Martinet, L. & >Mayor, M.. Sauverny: Geneva Observatory, 113 Google Scholar
Kormendy, J. 1982b, ApJ, 257, 75 Google Scholar
Kormendy, J. 1984, ApJ, 286, 116(NGC 1553)CrossRefGoogle Scholar
Martinet, L. 1995, Fund. Cosmic Physics 15, 341 Google Scholar
McKee, C.F. & Ostriker, J.P. 1977, ApJ, 218, 148 Google Scholar
McLeod, K.K. & Rieke, G.H. 1995, ApJ, 441, 96 CrossRefGoogle Scholar
Nishida, M.T. & Wakamatsu, K. 1993, PASJ, preprintGoogle Scholar
Norman, C.A., May, A., & van Albada, T.S. 1985, ApJ, 296, 20 CrossRefGoogle Scholar
Palous, J., Jungwiert, B., & Kopecky, J. 1993, A&A, 274, 189 Google Scholar
Pfenniger, D. & Combes, F. 1994, A&A, 285, 94 Google Scholar
Pfenniger, D. & Norman, C.A. 1990, ApJ, 363, 391 Google Scholar
Roberts, W.W. & Hausman, M.A. 1984, ApJ, 277, 744 Google Scholar
Sandage, A. & Brucato, R. 1979, AJ, 84, 472 CrossRefGoogle Scholar
Sanders, R.H. & Huntley, J.M. 1976, ApJ, 209, 53 CrossRefGoogle Scholar
Schempp, W.V. 1982, ApJ, 258, 96 Google Scholar
Schwarz, M.P. 1981, ApJ, 247, 77 Google Scholar
Schwarz, M.P. 1984, MNRAS, 209, 93 CrossRefGoogle Scholar
Shlosman, I., Frank, J., & Begelman, M. 1989, Nature, 338, 45 Google Scholar
Tsikoudi, V. 1980, ApJS, 43, 365 CrossRefGoogle Scholar
van Albada, G.D. 1985, A&A, 142, 491 Google Scholar
Wada, K. & Habe, A. 1992, MNRAS, 258, 82 Google Scholar
Zaritsky, D. & Lo, K.Y. 1986, ApJ, 303, 66 Google Scholar