Dynamical Evolution of Galaxies: Supercomputer N-Body Simulations

Edward Liverts; Evgeny Griv; Michael Gedalin; David Eichler

doi:10.1007/978-3-540-45040-5_28

Dynamical Evolution of Galaxies: Supercomputer N-Body Simulations

Edward Liverts, Evgeny Griv, Michael Gedalin, David Eichler

Research output: Chapter in Book/Report/Conference proceeding › Chapter › peer-review

Abstract

The time evolution of a computer model for an isolated disk representing a flat galaxy is studied. The method of direct integration of Newton’s equations of motion of particles-"stars" is applied. Using the modern 128-processor SGI Origin 2000 supercomputer in Israel, we make long simulation runs with a large number of particles, N = 100 000. One of the goals of the simulation is to test the validities of the modified Safronov-Toomre criterion for stability of arbitrary but not only axisymmetric Jeans-type gravity disturbances (e.g., those produced by a spontaneous perturbation and/or a companion system) in a self-gravitating, thin, and almost collisionless stellar disk. We are also interested in how model particles diffuse in chaotic (residual) velocity space. This is of considerable interest in the nonlinear theory of stellar disks.

Original language	English
Title of host publication	Galaxies and Chaos
Editors	George Contopoulos
Publisher	Springer
Pages	340-347
Number of pages	8
ISBN (Electronic)	9783540450405
ISBN (Print)	9783540404705
DOIs	https://doi.org/10.1007/978-3-540-45040-5_28
State	Published - 2003

Keywords

Velocity Dispersion
Spiral Galaxy
Spiral Structure
Stellar Disk
Jeans Instability

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10.1007/978-3-540-45040-5_28

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title = "Dynamical Evolution of Galaxies: Supercomputer N-Body Simulations",

abstract = "The time evolution of a computer model for an isolated disk representing a flat galaxy is studied. The method of direct integration of Newton{\textquoteright}s equations of motion of particles-{"}stars{"} is applied. Using the modern 128-processor SGI Origin 2000 supercomputer in Israel, we make long simulation runs with a large number of particles, N = 100 000. One of the goals of the simulation is to test the validities of the modified Safronov-Toomre criterion for stability of arbitrary but not only axisymmetric Jeans-type gravity disturbances (e.g., those produced by a spontaneous perturbation and/or a companion system) in a self-gravitating, thin, and almost collisionless stellar disk. We are also interested in how model particles diffuse in chaotic (residual) velocity space. This is of considerable interest in the nonlinear theory of stellar disks.",

keywords = "Velocity Dispersion, Spiral Galaxy, Spiral Structure, Stellar Disk, Jeans Instability",

author = "Edward Liverts and Evgeny Griv and Michael Gedalin and David Eichler",

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TY - CHAP

T1 - Dynamical Evolution of Galaxies

T2 - Supercomputer N-Body Simulations

AU - Liverts, Edward

AU - Griv, Evgeny

AU - Gedalin, Michael

AU - Eichler, David

PY - 2003

Y1 - 2003

N2 - The time evolution of a computer model for an isolated disk representing a flat galaxy is studied. The method of direct integration of Newton’s equations of motion of particles-"stars" is applied. Using the modern 128-processor SGI Origin 2000 supercomputer in Israel, we make long simulation runs with a large number of particles, N = 100 000. One of the goals of the simulation is to test the validities of the modified Safronov-Toomre criterion for stability of arbitrary but not only axisymmetric Jeans-type gravity disturbances (e.g., those produced by a spontaneous perturbation and/or a companion system) in a self-gravitating, thin, and almost collisionless stellar disk. We are also interested in how model particles diffuse in chaotic (residual) velocity space. This is of considerable interest in the nonlinear theory of stellar disks.

AB - The time evolution of a computer model for an isolated disk representing a flat galaxy is studied. The method of direct integration of Newton’s equations of motion of particles-"stars" is applied. Using the modern 128-processor SGI Origin 2000 supercomputer in Israel, we make long simulation runs with a large number of particles, N = 100 000. One of the goals of the simulation is to test the validities of the modified Safronov-Toomre criterion for stability of arbitrary but not only axisymmetric Jeans-type gravity disturbances (e.g., those produced by a spontaneous perturbation and/or a companion system) in a self-gravitating, thin, and almost collisionless stellar disk. We are also interested in how model particles diffuse in chaotic (residual) velocity space. This is of considerable interest in the nonlinear theory of stellar disks.

KW - Velocity Dispersion

KW - Spiral Galaxy

KW - Spiral Structure

KW - Stellar Disk

KW - Jeans Instability

U2 - 10.1007/978-3-540-45040-5_28

DO - 10.1007/978-3-540-45040-5_28

M3 - Chapter

SN - 9783540404705

SP - 340

EP - 347

BT - Galaxies and Chaos

A2 - Contopoulos, George

PB - Springer

ER -

Dynamical Evolution of Galaxies: Supercomputer N-Body Simulations

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Keywords

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