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Spiral Types

Published online by Cambridge University Press:  03 August 2017

Bruce G. Elmegreen
Bruce G. Elmegreen*
Affiliation:
IBM Research Division, Thomas J. Watson Research Center P.O. Box 218, Yorktown Heights, N.Y. 10598 USA

Abstract

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Spiral structure in galaxies and its relation to interstellar gas are reviewed. The evidence for spiral modes and resonance features in two-arm grand design galaxies is summarized. Gas observations of the corotation regions of these galaxies are needed. Multiple-arm galaxies could have several modes simultaneously, or they could lack modes altogether because of insufficient wave reflection in the central regions; then the spirals could result from transient shear instabilities. Flocculent galaxies may have similar shear instabilities but only in the gas. The importance of variable boundary conditions for clouds that flow through spirals is emphasized. These boundary conditions, such as pressure, radiation field, tidal force, and so on, affect the internal structure and molecular fraction of a cloud, and they could influence the calibration coefficient for determining mass from the CO luminosity. The importance of gas observations beyond the optical disk is also emphasized, to elucidate the role of the outer Lindblad resonance on wave propagation, and to study the proposed low-density cutoff for star formation.

Type
IV- Models of Spiral Structure
Information
Symposium - International Astronomical Union , Volume 146: Dynamics of Galaxies and their Molecular Cloud Distributions , 1991 , pp. 113 - 129
Copyright
Copyright © Kluwer 1991 

References

Athanassoula, E., Bosma, A., and Papaioannou, S. (1987) ‘Halo Parameters of Spiral Galaxies,’ Astron. Astrophys., 179, 23.Google Scholar
Beck, R. Loiseau, N., Hummel, E., Berkhuijsen, E., Grave, R., and Wielebinski, R. (1989) ‘High Resolution Polarization Observations of M31,’ Astron. Astrophys., 222, 58.Google Scholar
Bertin, G. (1983), ‘Dynamical Mechanisms for Discrete Unstable Spiral Modes in Galaxies,’ in Athanassoula, E. (ed.), IAU Symposium 100, Internal Kinematics and Dynamics of Galaxies, Reidel, Dordrecht, 119.Google Scholar
Bertin, G., Lin, C.C., Lowe, S.A., and Thurstans, R.P. (1989) ‘Modal Approach to the Morphology of Spiral Galaxies,’ Astrophys. J., 338, 78.Google Scholar
Boulanger, F., and Viallefond, F. (1990), ‘Observational Study of the Spiral Galaxy NGC 6946: I. HI and Radio Continuum Observations,’ Astron. Astrophys., submitted.Google Scholar
Carlberg, R.G., and Freedman, W.L. (1985) ‘Dissipative Models of Spiral Galaxies,’ Astrophys. J., 298, 486.Google Scholar
Casoli, F., Clausset, F., Viallefond, F., Combes, F., and Boulanger, F. (1990) ‘12CO (1-0) and 12CO (2-1) Mapping of Gas Complexes in the Spiral Galaxy NGC 6946: Comparison with HI and HII Regions,’ Astron. Astrophys., 233, 357.Google Scholar
Cepa, J., and Beckman, J.E. (1990) ‘Star Formation Triggering by Density Waves in the Grand Design Spirals NGC 3992 and NGC 628,’ Astrophys. J., 349, 497.Google Scholar
Considere, S., and Athanassoula, E. (1988) ‘Analysis of Spiral Components in 16 Galaxies,’ Astron. Astrophys., 207, 215.Google Scholar
Contopoulos, G., and Grosb⊘l, P. (1986) ‘Stellar Dynamics of Spiral Galaxies: Nonlinear Effects at the 4/1 Resonance,’ Astron. Astrophys., 155, 11.Google Scholar
Contopoulos, G., and Grosb⊘l, P. (1988) ‘Stellar Dynamics of Spiral Galaxies: Self-consistent Models,’ Astron. Astrophys., 197, 83.Google Scholar
de Vaucouleurs, G., de Vaucouleurs, A., and Corwin, H.G. (1976) Second Reference Catalog of Bright Galaxies, Univ. of Texas, Austin.Google Scholar
Elmegreen, B.G. (1987) ‘Supercloud Formation by Gravitational Instabilities in Sheared Magnetic Galaxy Disks,’ Astrophys. J., 312, 626.Google Scholar
Elmegreen, B.G. (1988) ‘Star Formation in Normal Galaxies,’ in Lawrence, A. (ed.), Comets to Cosmology, Springer-Verlag, Berlin, 186.Google Scholar
Elmegreen, B.G. (1989) ‘A Pressure and Metallicity Relation for Molecular Cloud Correlations and the Calibration of Mass,’ Astrophys. J., 338, 178.Google Scholar
Elmegreen, B.G. (1990a), ‘Spiral Galaxies,’ Symmetry, in press (October 1990).Google Scholar
Elmegreen, B.G. (1990b) ‘Formation of Interstellar Clouds,’ in Levy, E.S. and Matthews, M.S. (eds.), Protostars and Planets III, Univ. of Arizona, Tucson, in press.Google Scholar
Elmegreen, B.G., and Elmegreen, D.M. (1983a) ‘Regularly Spaced H II Regions and Superclouds in Spiral Galaxies: Clues to the Origins of Cloudy Structure,’ Mon.Not.Royal Astron.Soc., 203, 31.Google Scholar
Elmegreen, B.G., and Elmegreen, D.M. (1983b) ‘Flocculent and Grand Design Spiral Galaxies in Groups: Time Scales for the Persistence of Grand Design Spiral Structure,’ Astrophys. J., 267, 31.Google Scholar
Elmegreen, B.G., and Elmegreen, D.M. (1985) ‘Properties of Barred Galaxies,’ Astrophys. J., 288, 438.CrossRefGoogle Scholar
Elmegreen, B.G., and Elmegreen, D.M. (1986) ‘Do Density Waves Trigger Star Formation?,’ Astrophys. J., 311, 554.Google Scholar
Elmegreen, B.G., and Elmegreen, D.M. (1987) ‘HI Superclouds in the Inner Galaxy,’ Astrophys. J., 320, 182.Google Scholar
Elmegreen, B.G., and Elmegreen, D.M. (1989a) ‘The Arms of Spiral Galaxies,’ in Beckman, J.E. and Pagel, B.E.J. (eds.), Evolutionary Phenomena in Galaxies, Reidel, Dordrecht, 83.Google Scholar
Elmegreen, B.G., and Elmegreen, D.M. (1989b) ‘On the Relative Frequency of Flocculent and Grand Design Spiral Structures in Barred Galaxies,’ Astrophys. J., 342, 677.Google Scholar
Elmegreen, B.G., Elmegreen, D.M., and Seiden, P.E. (1989) ‘Spiral Arm Amplitude Variations and Pattern Speeds in the Grand Design Galaxies M51, M81 and M100,’ Astrophys. J., 343, 602.CrossRefGoogle Scholar
Elmegreen, B.G., and Elmegreen, D.M. (1990) ‘Optical Tracers of Spiral Wave Resonances in Galaxies: Applications to NGC 1566,’ Astrophys. J., 355, 52.Google Scholar
Elmegreen, B.G., and Thomasson, M. (1990) ‘On the Origin of Flocculent Spiral Structure in Galaxies,’ Astrophys. J., submitted.Google Scholar
Elmegreen, D.M. (1980a) ‘An Optical Analysis of Dust Complexes in Spiral Galaxies,’ Astrophys. J. Suppl., 43, 37.Google Scholar
Elmegreen, D.M. (1980b) ‘Properties of Spurs in Spiral Galaxies,’ Astrophys. J., 242, 528.Google Scholar
Elmegreen, D.M., and Elmegreen, B.G. (1984) ‘Blue and Near-Infrared Surface Photometry of Spiral Structure in 34 Non-Barred Grand Design and Flocculent Galaxies,’ Astrophys. J. Suppl., 54, 127.Google Scholar
Elmegreen, D.M., and Elmegreen, B.G. (1990) ‘Evidence for Small Halos in Grand Design Spiral Galaxies,’ Astrophys. J., 364, in press.Google Scholar
Federman, S.R., Glassgold, A.E., and Kwan, J. (1979) ‘Atomic to Molecular Hydrogen Transition in Interstellar Clouds,’ Astrophys. J., 227, 466.Google Scholar
Fridman, A.M., Morozov, A.G., Nezlin, M.V., Pasha, I.I., Polyachenko, V.L., Rylov, A. Yu., Snezhkin, E.N., Torgashin, Yu.N., Trubnikov, A.S. (1987) ‘On the Hydrodynamical Conception of the Spiral Structure in Galaxies with a Velocity Kink on the Rotation Curve,’ in Khachikian, E. Ye., Fricke, K.J., and Melnick, J. (eds.), Observational Evidence of Activity in Galaxies, Reidel, Dordrecht, 147.Google Scholar
Giuricin, G., Mardirossian, F., Mezzetti, M. (1989) ‘Radio Continuum Emission and Arm Classification in Spiral Galaxies,’ Astron. Astrophys., 208, 27.Google Scholar
Goldreich, P., and Lynden-Bell, D. (1965) ‘Gravitational Instability of Uniformly Rotating Disks,’ Mon.Not.Royal Astron.Soc., 130, 97.Google Scholar
Guiderdoni, B. (1987) ‘Evolution of Spiral Galaxies in the Virgo Cluster: II. Evidence for a Threshold in Star Formation Processes,’ Astron. Astrophys., 172, 27.Google Scholar
Ikeuchi, S. (1988) ‘Fundamental Processes in the Interstellar Medium and Evolution of Galaxies,’ Fund.Cosmic Physics, 12, 255.Google Scholar
Kennicutt, R.C. Jr. (1989) ‘The Star Formation Law in Galactic Disks,’ Astrophys. J., 344, 685.Google Scholar
Kennicutt, R.C. Jr. (1990) ‘Large Scale Star Formation and the Interstellar Medium,’ in Thronson, H.A. and Shull, J.M. (eds.), The Interstellar Medium in Galaxies, Kluwer, Dordrecht, 405.Google Scholar
Lin, C.C. (1970) ‘Interpretation of Large Scale Spiral Structure,’ in Becker, W. and Contopoulos, G. (eds.), IAU Symposium 38, The Spiral Structure of our Galaxy, Reidel, Dordrecht, 377.Google Scholar
Lin, C.C. (1983), ‘Quasi-Stationary Spiral Structure in Galaxies,’ in Athanassoula, E. (ed.), IAU Symposium 100, Internal Kinematics and Dynamics of Galaxies, Reidel, Dordrecht, 117.Google Scholar
Lin, C.C., and Shu, F.H. (1967) ‘Density Waves in Disk Galaxies,’ in van Woerden, H. (ed.), IAU Symposium 31, Radio Astronomy and the Galactic System, Academic Press, New York, 313.Google Scholar
Lin, C.C., and Lowe, S.A. (1990) ‘Models of Galaxies - The Modal Approach,’ in Buchler, J.R., Gottesman, S.T., and Hunter, J.H. Jr. (eds.), Galactic Models, Annals of New York Academy of Science, 596, 80.Google Scholar
Lord, S.D., and Young, J.S. (1990) ‘Efficient Star Formation in the Spiral Arms of M51,’ Astrophys. J., 356, 135.Google Scholar
Lowe, S.A., Lin, C.C., and Roberts, W.W. Jr. (1990) ‘Modal Approach to the Morphology of Spiral Galaxies: III. Comparison with Observations,’ Astrophys. J., in prep.Google Scholar
Lynden-Bell, D. (1966) ‘The Role of Magnetism in Spiral Structure,’ Observatory, 86, 57.Google Scholar
Mark, J.W.K. (1976) ‘On Density Waves in Galaxies: III. Wave Amplification by Stimulated Emission,’ Astrophys. J., 205, 363.Google Scholar
McCall, M.L., and Schmidt, F.H. (1986) ‘Supernovae in Flocculent and Grand Design Spirals,’ Astrophys. J., 311, 548.Google Scholar
McGee, R.X., and Milton, J.A. (1964) Australian J. Phys., 17, 128.Google Scholar
Ondrechen, M.P. (1985) ‘Radio Continuum Observations of the Bar and Disk in M83,’ Astron.J., 90, 1474.CrossRefGoogle Scholar
Polk, K.S., Knapp, G.R., Stark, A.A., Wilson, R.W. (1988) ‘Molecules in Galaxies VI: Diffuse and Dense Cloud Contributions to the Large-Scale CO Emission of the Galaxy,’ Astrophys. J., 332, 432.Google Scholar
Quirk, W.J. (1972) ‘On the Gas Content of Galaxies,’ Astrophys. J.(Letters), 176, L9.Google Scholar
Rand, R.J., and Kulkarni, S. (1990) ‘M51: Molecular Spiral Arms, Giant Molecular Associations, and Superclouds,’ Astrophys. J.(Letters), 349, L43.CrossRefGoogle Scholar
Roberts, W.W., Roberts, M.S., and Shu, F.H. (1975) ‘Density Wave Theory and Classification of Spiral Galaxies,’ Astrophys. J., 196, 381.Google Scholar
Rots, A.H. (1975) ‘Distribution and Kinematics of Neutral Hydrogen in the Spiral Galaxy M81,’ Astron. Astrophys., 45, 43.Google Scholar
Scoville, N.Z., Sanders, D.B., and Clemens, D.P. (1986) ‘High Mass Star Formation due to Cloud Collisions,’ Astrophys. J.(Letters), 310, L77.CrossRefGoogle Scholar
Seiden, P.E., and Schulman, L.S. (1990) ‘Percolation Model of Galactic Structure,’ Advances in Physics, 39, 1.Google Scholar
Sellwood, J.A. (1989) ‘Internal Evolution of Spiral Galaxies,’ in Palous, J. (ed.), Evolution of Galaxies, Czechoslovakian Academy of Science, Prague, 249.Google Scholar
Sellwood, J.A., and Sparke, L.S. (1988) ‘Pattern Speeds in Barred Spiral Galaxies,’ Mon.Not.Royal Astron.Soc, 231, 25p.Google Scholar
Solomon, P.M., Rivolo, A.R., Barrett, J., and Yahil, A. (1987) ‘Mass, Luminosity and Line Width Relations of Galactic Molecular Clouds,’ Astrophys. J., 319, 730.Google Scholar
Tacconi, L.J., and Young, J.S. (1990) ‘The Distribution of the Interstellar Medium in the Scd Galaxy NGC 6946: III. Azimuthal Variations in the Molecular and Atomic Components,’ Astrophys. J., 352, 595.Google Scholar
Thomasson, M., Elmegreen, B.G., Donner, K.J., and Sundelius, B. (1990) ‘A Computer Generated Galaxy Model with Long-Lived, Two-Armed Spiral Structure,’ Astrophys. J.(Letters), 356, L9.CrossRefGoogle Scholar
Tilanus, R.P.J., and Allen, R.J. (1989) ‘Spiral Structure in M51: Displacement of the HI from the Nonthermal Radio Arms,’ Astrophys. J.(Letters), 339, L57.Google Scholar
Toomre, A. (1977) ‘Theories of Spiral Structure,’ Ann. Rev. Astron. Astrophys., 15, 437.Google Scholar
Toomre, A. (1981) ‘What Amplifies the Spirals?’ in Fall, S.M. and Lynden-Bell, D. (eds.), The Structure and Evolution of Normal Galaxies, Cambridge University, Cambridge, 111.Google Scholar
Vogel, S., Kulkarni, S.R., and Scoville, N. (1988) ‘Star Formation in Giant Molecular Associations Synchronized by a Spiral Density Wave,’ Nature, 334, 402.Google Scholar
Wiklind, T., Rydbeck, G., Hjalmarson, Å., Bergman, P. (1990) ‘Arm and Interarm Molecular Clouds in M83,’ Astron. Astrophys., 232, L11.Google Scholar
Young, J.S., and Knezek, P.M. (1989) ‘The Ratio of Molecular to Atomic Gas in Spiral Galaxies as a Function of Morphological Type,’ Astrophys. J.(Letters), 347, L55.Google Scholar