Avishai Dekel
Avishai Dekel
Avishai Dekelis a professor of physics at The Hebrew University of Jerusalem, Israel, holding the Andre Aisenstadt Chair of Theoretical Physics. He is performing research in astrophysics and cosmology. Prof. Dekel got his Ph.D. from the Hebrew University in 1980, and was a research fellow at Caltech and an assistant professor at Yale University before joining the faculty of The Hebrew University in 1986. He served as the Head of The Racah Institute of Physics, the Dean of the Authority...
case center circular compact galaxies galaxy higher less likely move predict star toward velocity
We predict that other velocity tracers in the same elliptical galaxies will show higher velocities if they are less concentrated toward the galaxy center or if they move on more circular orbits. This is likely to be the case for compact star clusters, which are also observable in the outskirts of elliptical galaxies.
clearly dark disappear massive matter
Massive dark matter halos are clearly detected in disk galaxies, so where did they disappear to during the mergers?
identified main seems solution
It seems that we have identified the main solution to the problem.
almost center distance either large line mostly motion moving star toward
If we see a star at a large distance from the center of the galaxy, that star is going to be mostly moving either away from the center or back toward the center. Almost certainly, most of its motion is perpendicular to our line of sight.
close fairly far highly large merger process produces stars
In the merger process that produces these galaxies, a lot of the stars get flung out to fairly large distances, and they end up in highly elongated orbits that take them far away and then back in close to the center.