DISC GALAXIES WITH MULTIPLE TRIAXIAL STRUCTURES .2. JHK SURFACE PHOTOMETRY AND NUMERICAL SIMULATIONS

Citation
D. Friedli et al., DISC GALAXIES WITH MULTIPLE TRIAXIAL STRUCTURES .2. JHK SURFACE PHOTOMETRY AND NUMERICAL SIMULATIONS, Astronomy & Astrophysics. Supplement series, 118(3), 1996, pp. 461-479
Citations number
41
Categorie Soggetti
Astronomy & Astrophysics
ISSN journal
03650138
Volume
118
Issue
3
Year of publication
1996
Pages
461 - 479
Database
ISI
SICI code
0365-0138(1996)118:3<461:DGWMTS>2.0.ZU;2-Q
Abstract
We present detailed JHK surface photometry with ellipse fits of 13 gal axies 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 wit h an additional intermediate structure with twisted isophotes, and 3 g alaxies with a bar and central twisted isophotes. A global analysis of the structural parameter characteristics in the I- and K-bands is pre sented. 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 ex plain this phenomenon is given with emphasis on the most likely ones.