The Density Profile of Local Ellipticals as Violently Relaxed, Collisionless, Dissipationless Systems

Details The Density Profile of Local Ellipticals as Violently Relaxed, Collisionless, Dissipationless Systems The Density Profile of Local Ellipticals as Violently Relaxed, Collisionless, Dissipationless Systems

2007-04-17

arxiv.org/abs/0704.2228v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures

Scientific paper

In a series of recent papers, a new formalism has been developed that explains the inner structure of dark matter halos as collisionless, dissipationless systems assembled through mergers and accretion at the typical cosmological rate. Nearby ellipticals are also collisionless, dissipationless systems assembling their mass through mergers, but contrarily to the former structures they do not continuously accrete external matter because they are shielded by their host halos. Here we explore the idea that the infall of their own matter ejected within the halo on the occasion of a violent merger can play a role similar to external accretion in halos. The predicted stellar mass density profile fits the observed one, and the empirical total mass density profile is also recovered.

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