Structure and kinematics of edge-on galaxy discs - I. Observations of the stellar kinematics

M. Kregel, P. C. van der Kruit, K. C. Freeman

Research output: Contribution to journalArticleAcademicpeer-review

23 Citations (Scopus)
160 Downloads (Pure)

Abstract

We present deep optical long-slit spectra of 17 edge-on spiral galaxies of intermediate to late morphological type, mostly parallel to their major axes and in a few cases parallel to the minor axes. The line-of-sight stellar kinematics are obtained from the stellar absorption lines using the improved cross-correlation technique. In general, the stellar kinematics are regular and can be traced well into the disc-dominated region. The mean stellar velocity curves are far from solid-body, indicating that the effect of dust extinction is not large. The line-of- sight stellar disc velocity dispersion correlates with the galaxy maximum rotational velocity, but detailed modelling is necessary to establish whether this represents a physical relation. In four spirals with a boxy- or peanut-shaped bulge we are able to detect asymmetric velocity distributions, having a common signature with projected radius in the mean line-of- sight velocity and the h(3) and h(4) curves. In two cases this kinematic asymmetry probably represents the 'figure-of-eight' pattern synonymous with a barred potential. We emphasize, however, that the signatures seen in the h(3) and h(4) curves may also be due to the disc seen in projection.

Original languageEnglish
Pages (from-to)1247-1265
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Volume351
Issue number4
DOIs
Publication statusPublished - 11-Jul-2004

Keywords

  • galaxies : fundamental parameters
  • galaxies : kinematics and dynamics
  • galaxies : spiral
  • galaxies : structure
  • ABSORPTION-LINE SPECTRA
  • SPIRAL GALAXIES
  • SURFACE PHOTOMETRY
  • GALACTIC DISKS
  • 3-DIMENSIONAL DISTRIBUTION
  • VELOCITY DISTRIBUTIONS
  • ELLIPTIC GALAXIES
  • STAR-FORMATION
  • SHAPED BULGES
  • NGC-891

Cite this