Minor axis kinematics of 19 S0-Sbc bulges

Details Minor axis kinematics of 19 S0-Sbc bulges Minor axis kinematics of 19 S0-Sbc bulges

2003-03-31

arxiv.org/abs/astro-ph/0303667v1

Astron.Astrophys. 405 (2003) 455-472

Astronomy and Astrophysics

Astrophysics

18 pages, 28 figures (9 images in main body, 19 low resolution images in appendix A), the preprint with high resolution images

Scientific paper

10.1051/0004-6361:20030470

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 Vazdekis et al. 2003, 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 Cenarro et al. 2001a, 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.

Affiliated with

Also associated with

No associations

Rating

Minor axis kinematics of 19 S0-Sbc bulges does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Minor axis kinematics of 19 S0-Sbc bulges, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Minor axis kinematics of 19 S0-Sbc bulges will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-102345