| Type |
Journal Article |
| Names |
David R. Andersen, Matthew A. Bershady, Linda S. Sparke, John S. Gallagher, Eric M. Wilcots, Wim van Driel, Delphine Monnier-Ragaigne |
| Publication |
The Astrophysical Journal Supplement Series |
| Volume |
166 |
| Issue |
2 |
| Pages |
505-525 |
| Date |
October 1, 2006 |
| URL |
http://adsabs.harvard.edu/abs/2006ApJS..166..505A |
| Library Catalog |
NASA ADS |
| Abstract |
We present a survey of the photometric and kinematic properties of 39
nearby, nearly face-on disk galaxies. Our approach exploits
echelle-resolution integral-field spectroscopy of the Hα regions,
obtained with DensePak on the WIYN 3.5 m telescope Bench Spectrograph.
These data are complemented by H I line profiles observed with the
Nançay radio telescope for 25 of these sample galaxies. Twelve
additional line widths are available for sample galaxies from the
literature. In this paper, we introduce the goals of this survey, define
the sample selection algorithm, and amass the integral field
spectroscopic data and H I line widths. We establish spatially
integrated Hα line widths for the sample. We test the veracity of
these spatially integrated line profiles by convolving narrowband
imaging data with velocity field information for one of the sample
galaxies, PGC 38268, and also by comparing to H I line profiles. We find
H I and Hα line profiles to be similar in width but different in
shape, indicating that we are observing different spatial distributions
of ionized and neutral gas in largely axisymmetric systems with flat
outer rotation curves. We also find vertical velocity dispersions of the
ionized disk gas within several disk scale lengths have a median value
of 18 km s-1 and an 80% range of 12-26 km s-1.
This is only a factor of ~2 larger than what is observed for neutral
atomic and molecular gas. With standard assumptions for intrinsic and
thermal broadening for Hα, this translates into a factor of 3
range in turbulent velocities, between 8 and 25 km s-1. |
| Tags |
GALAXIES: STRUCTURE, galaxies: kinematics and dynamics, galaxies: spiral |