Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-02-19
Phys.Rev.D80:063517,2009
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
14 pages, accepted for publication in PRD
Scientific paper
10.1103/PhysRevD.80.063517
Numerical simulations of the effect of a long-range scalar interaction (LRSI) acting only on nonbaryonic dark matter, with strength comparable to gravity, show patterns of disruption of satellites that can agree with what is seen in the Milky Way. This includes the symmetric Sagittarius stellar stream. The exception presented here to the Kesden and Kamionkowski demonstration that an LRSI tends to produce distinctly asymmetric streams follows if the LRSI is strong enough to separate the stars from the dark matter before tidal disruption of the stellar component, and if stars dominate the mass in the luminous part of the satellite. It requires that the Sgr galaxy now contains little dark matter, which may be consistent with the Sgr stellar velocity dispersion, for in the simulation the dispersion at pericenter exceeds virial. We present other examples of simulations in which a strong LRSI produces satellites with large mass-to-light ratio, as in Draco, or free streams of stars, which might be compared to "orphan" streams.
Keselman Jose Ariel
Nusser Adi
Peebles P. J. E.
No associations
LandOfFree
Galaxy Satellites and the Weak Equivalence Principle 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 Galaxy Satellites and the Weak Equivalence Principle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Galaxy Satellites and the Weak Equivalence Principle will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-669737