Disc galaxies with multiple triaxial structures. * II. JHK surface photometry and numerical simulations

D. Friedli, H. Wozniak, M. Rieke, L. Martinet, P. Bratschi

Research output: Contribution to journalArticle

101 Scopus citations

Abstract

We present detailed JHK surface photometry with ellipse fits of 13 galaxies selected from previous optical observations as likely candidates for having a secondary bar or a triaxial bulge within the primary bar. We have found 7 double-barred galaxies, 3 double-barred galaxies with an additional intermediate structure with twisted isophotes, and 3 galaxies with a bar and central twisted isophotes. A global analysis of the structural parameter characteristics in the I- and K-bands is presented. Various numerical models of galaxies with bars within bars are also analysed using the ellipse fitting technique and compared to the observations. A thorough review of the possible hypotheses able to explain this phenomenon is given with emphasis on the most likely ones.

Original languageEnglish (US)
Pages (from-to)461-479
Number of pages19
JournalAstronomy and Astrophysics Supplement Series
Volume118
Issue number3
DOIs
StatePublished - Jan 1 1996
Externally publishedYes

Keywords

  • Galaxies: fundamental parameters
  • Galaxies: nuclei galaxies: evolution
  • Galaxies: photometry
  • Galaxies: structure

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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