Bibcode
Falcón-Barroso, J.; Balcells, M.; Peletier, R. F.; Vazdekis, A.
Bibliographical reference
Astronomy and Astrophysics, v.405, p.455-471 (2003)
Advertised on:
7
2003
Journal
Citations
31
Refereed citations
28
Description
We present minor axis kinematic profiles for a well-studied sample of 19
early- to intermediate-type disk galaxies. We introduce, for the first
time, the use of single-burst stellar population (SSP) models to obtain
stellar velocities, velocity dispersions and higher order Gauss-Hermite
moments (h3, h4) from galaxy spectra in the
near-infrared Ca II triplet region. SSP models, which employs the
synthetic spectra of citet{vazdekis03}, provide a means to address the
template-mismatch problem, and are shown to provide as good or better
fits as traditional stellar templates. We anticipate the technique to be
of particular use for high-redshift galaxy kinematics. We give the
measurement of a recently defined CaT* index
citep{cenarro01}, and describe the global properties of the bulge
kinematics as derived from the kinematic profiles. We detect
small-amplitude minor-axis rotation, generally due to inner isophotal
twists as a result of slightly triaxial bulges or misaligned inner
disks; such inner features do not show peculiar colors or distinct
CaT* index values. Velocity dispersion profiles, which extend
well into the disk region, show a wide range of slopes. Flattened bulges
tend to have shallower velocity dispersion profiles. The inferred
similarity of bulge and disk radial velocity dispersions supports the
interpretation of these bulges as thickened disks.
Appendix B is only available in electronic form at
http://www.edpsciences.org