Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-11-05
Astronomy and Astrophysics
Astrophysics
8 pages LaTeX, 5 figures (style file paspconf.sty). To appear in ``Dark and Visible Matter in Galaxies and Cosmological Implic
Scientific paper
A Tully-Fisher (TF) relation from H-alpha rotation curves of 19 luminous, star-forming galaxies reveals there is little evidence for evolution in the mass-to-light ratio (M/L) of these galaxies to z~0.3. The near-infrared Tolman surface-brightness test for other luminous galaxies indicates their luminosity also is little changed to z~0.3. In this redshift regime, internal velocity -- luminosity relations like Tully-Fisher may provide a way to measure q0. Discrepant results from several intermediate redshift Tully-Fisher surveys, however, must be understood first. One possibility is that different surveys sample different galaxy types and TF relations. Alternatively, M/L of some spiral galaxies may evolve rapidly with look-back time. Larger surveys are needed to resolve this issue. A different approach is to determine disk and halo M/L separately. Such measurements, even at low redshift, would be sensitive to the star formation histories of disks. We outline plans for lambda/dlambda ~ 10000 integral-field spectroscopy of relatively face-on spirals using the 9m Hobby-Eberly Telescope. Rotation curves and disk stellar velocity dispersions can provide statistical information about the M/L of dark halos as well as luminous disks.
No associations
LandOfFree
Spatially Resolved Kinematics of Distant Galaxies 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 Spatially Resolved Kinematics of Distant Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spatially Resolved Kinematics of Distant Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-55963