1. Dissipative dark matter and the Andromeda plane of satellites
- Author
-
Lisa Randall and Jakub Scholtz
- Subjects
Physics ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Dark matter ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Galactic plane ,Galaxy merger ,Astrophysics - Astrophysics of Galaxies ,Galaxy ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,Thin disk ,Astrophysics of Galaxies (astro-ph.GA) ,Satellite galaxy ,Astrophysics::Earth and Planetary Astrophysics ,Mass-to-light ratio ,Astrophysics::Galaxy Astrophysics ,Astrophysics - Cosmology and Nongalactic Astrophysics ,Dwarf galaxy - Abstract
We show that dissipative dark matter can potentially explain the large observed mass to light ratio of the dwarf satellite galaxies that have been observed in the recently identified planar structure around Andromeda, which are thought to result from tidal forces during a galaxy merger. Whereas dwarf galaxies created from ordinary disks would be dark matter poor, dark matter inside the galactic plane not only provides a source of dark matter, but one that is more readily bound due to the dark matter's lower velocity. This initial N-body study shows that with a thin disk of dark matter inside the baryonic disk, mass-to-light ratios as high as O(30) can be generated when tidal forces pull out patches of sizes similar to the scales of Toomre instabilities of the dark disk. A full simulation will be needed to confirm this result., Comment: 13 pages, 12 figures
- Published
- 2015