A reinvestigation of gas response to an ovally deformed gravitational potential

Takuya Matsuda, Minoru Inoue, Keisuke Sawada, Eiji Shima, Ken Ichi Wakamatsu

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

The response of gas to an ovally deformed gravitational potential or a weak bar of a disc galaxy is investigated by the implicit Osher upwind scheme with second-order of accuracy in space and a 180x180 polar grid. Flow patterns obtained are sensitive to the pattern speed and the degree of a distortion from the axisymmetric part of the gravitational potential. Tightly wound spiral patterns were obtained even with a non-axisymmetric perturbation whose amplitude was as low as 0.01. Not only trailing arms but also leading arms are obtained in the inner region of model galaxies. When the amplitude of the non-axisymmetric perturbation is 0.05, we obtained loosely wound spirals.

Original languageEnglish
Pages (from-to)295-314
Number of pages20
JournalMonthly Notices of the Royal Astronomical Society
Volume229
Issue number2
DOIs
Publication statusPublished - 1987 Jan
Externally publishedYes

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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