On possible systematic redshift across the disks of galaxies.
Abstract
Velocity observations in 25 galaxies have been examined for possible systematic redshifts across their disks: a possible origin for the redshifts could be the radiation fields. Velocities increase towards the far side in most cases. This is so for the ionized gas, for the neutral hydrogen, and in some cases also for the stars. The effect is seen as velocity gradients along the minor axes, as well as in velocity fields of neutral hydrogen in other parts of the galaxies. Deviation of the kinematic major axis from the optical axis is found for 10 galaxies and in 9 of these the largest velocities occur in the far side. In the central regions of four galaxies are found large velocity gradients in the same direction. While expanding motions provide an explanation for some of these features, it remains difficult to thereby explain all the peculiarities found. Faintness of the data available in this preliminary study should be noticed. Observations specially programmed for this subject would be necessary.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- May 1975
- Bibcode:
- 1975A&A....40..257J
- Keywords:
-
- Galactic Radiation;
- Red Shift;
- Velocity Distribution;
- Galactic Rotation;
- Galactic Structure;
- Hydrogen;
- Ionized Gases;
- Radial Velocity;
- Stellar Motions;
- Astronomy