A note on shock wave in the dark matter medium
Mofazzal Azam, M Sami, Farook Rahaman
TL;DR
This paper estimates the sound velocity in dark matter medium using galaxy rotation data, revealing that satellite galaxies move supersonically, which could generate shock waves in dark matter.
Contribution
It introduces a method to determine dark matter sound speed from galaxy rotation velocities and predicts shock wave formation due to satellite galaxy motion.
Findings
Sound velocity in dark matter is much lower than satellite galaxy velocities.
Satellite galaxies move supersonically in the dark matter medium.
Potential formation of shock waves in dark matter caused by satellite galaxy motion.
Abstract
Employing Newton's stellar balance equation and using the flat rotation velocity of satellite galaxies, we have found the velocity of sound in the dark matter medium. What is interesting is that the velocity of satellite galaxies is very much larger than the velocity of sound in the dark matter medium. This indicates that there will be shock wave in the dark matter medium due to the supersonic movement of satellite galaxies.
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Scientific Research and Discoveries · Stellar, planetary, and galactic studies