Dynamics of ringed barred spiral galaxies. I. Surface photometry and kinematics of NGC 1433 and NGC 6300

R. Buta*, Stuart D. Ryder, Gregory J. Madsen, Karen Wesson, D. A. Crocker, F. Combes

*Corresponding author for this work

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

This paper presents new near-infrared images and surface photometry and Hα Fabry-Perot radial velocities for NGC 1433 and NGC 6300, two large and previously well-studied nearby ringed barred spiral galaxies. Stellar absorption-line radial velocities and new optical surface photometry are also presented for NGC 1433. The data are intended to set the stage for dynamical modeling of the two galaxies, with the principal goals being to derive mass distributions, bar mass-to-light ratios, bar pattern speeds, and resonance locations, parameters which have been derived for very few ringed disk galaxies. The presence of strong rings and pseudorings in the two galaxies allows the possibility to link specific orbital resonances with the observed rings. The new data allow us to derive a fairly complete composite rotation curve of NGC 1433, leading us to make some interesting preliminary judgments about the structure of the galaxy. The new data also verify the previous finding that the radial velocity of the Seyfert nucleus in NGC 6300 differs from the actual systemic velocity of the galaxy by nearly 100 km s-1. We demonstrate in this paper that the offset is not an artifact of significant extinction in the inner regions of the galaxy.

Original languageEnglish
Pages (from-to)225-243
Number of pages19
JournalAstronomical Journal
Volume121
Issue number1
DOIs
Publication statusPublished - 1 Jan 2001
Externally publishedYes

Keywords

  • galaxies : individual (NGC 1433, NGC 6300)
  • galaxies : kinematics and dynamics
  • galaxies : structure

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