Two-dimensional caustics in disturbed galaxy disks

Struck-Marcell, C

doi:10.1086/115314

Title: Two-dimensional caustics in disturbed galaxy disks

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Abstract

Interacting galaxies show a variety of exotic morphologies besides the well-known rings, spirals, and bars. It is proposed that many of these can be identified with nonlinear, caustic structures that are known from singularity theory to be generic in collisionless dynamics. A simple kinematical model for stellar orbits is used to study the development of caustic waveforms in galaxy disks following impulsive, nonaxially symmetric (collisional) disturbances. It appears that all of the caustics known from singularity theory to be generic in two dimensions develop as transient forms in at least some moderately off-center collisions. The more complex, higher-order caustics appear most prominently in the more off-center and larger amplitude disturbances. It is further suggested that the highly nonlinear caustic waves may play an important role in interaction-induced star formation. 38 refs.

Authors:

Struck-Marcell, C ^[1]

Iowa State Univ. of Science and Technology, Ames (USA)

Publication Date:: Mon Jan 01 00:00:00 EST 1990

OSTI Identifier:: 6863333

Resource Type:: Journal Article

Journal Name:: Astronomical Journal; (USA)

Additional Journal Information:: Journal Volume: 99; Journal ID: ISSN 0004-6256

Country of Publication:: United States

Language:: English

Subject:: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; GALAXIES; GRAVITATIONAL INTERACTIONS; GALAXY NUCLEI; MANY-BODY PROBLEM; MATHEMATICAL MODELS; MORPHOLOGY; MOTION; NONLINEAR PROBLEMS; ORBITS; STAR EVOLUTION; STARS; BASIC INTERACTIONS; INTERACTIONS; 640105* - Astrophysics & Cosmology- Galaxies

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                    Struck-Marcell, C. Two-dimensional caustics in disturbed galaxy disks.  United States: N. p., 1990. 
        Web.  doi:10.1086/115314.

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                    Struck-Marcell, C. Two-dimensional caustics in disturbed galaxy disks.  United States.  https://doi.org/10.1086/115314

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                    Struck-Marcell, C. 1990.  
        "Two-dimensional caustics in disturbed galaxy disks".  United States.  https://doi.org/10.1086/115314.

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@article{osti_6863333,

  title        = {Two-dimensional caustics in disturbed galaxy disks},

  author       = {Struck-Marcell, C},

  abstractNote = {Interacting galaxies show a variety of exotic morphologies besides the well-known rings, spirals, and bars. It is proposed that many of these can be identified with nonlinear, caustic structures that are known from singularity theory to be generic in collisionless dynamics. A simple kinematical model for stellar orbits is used to study the development of caustic waveforms in galaxy disks following impulsive, nonaxially symmetric (collisional) disturbances. It appears that all of the caustics known from singularity theory to be generic in two dimensions develop as transient forms in at least some moderately off-center collisions. The more complex, higher-order caustics appear most prominently in the more off-center and larger amplitude disturbances. It is further suggested that the highly nonlinear caustic waves may play an important role in interaction-induced star formation. 38 refs.},

  doi          = {10.1086/115314},

  url          = {https://www.osti.gov/biblio/6863333},
  journal      = {Astronomical Journal; (USA)},

  issn         = {0004-6256},

  number       = ,

  volume       = 99,

  place        = {United States},

  year         = {Mon Jan 01 00:00:00 EST 1990},

  month        = {Mon Jan 01 00:00:00 EST 1990}

}

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