Dynamical consequences of CDM merger trees

Details Dynamical consequences of CDM merger trees Dynamical consequences of CDM merger trees

2002-10-23

arxiv.org/abs/astro-ph/0210525v2

Mon.Not.Roy.Astron.Soc.347:1316,2004

Astronomy and Astrophysics

Astrophysics

14 pages including 7 figures, accepted for publication in MNRAS. High resolution figures 2 and 3 can be foun at:http://www.ast

Scientific paper

10.1111/j.1365-2966.2004.07329.x

Within the context of the standard structure formation scenario, massive present day elliptical galaxies are sometimes thought of as the result of a major merger of spiral systems. Through extensive SPH simulations of merging spirals, we have explored these processes with the aim of quantifying their relaxation times. This is important, as it sets a minimum time interval between the onset of a merger, and the appearance of an elliptical galaxy. We then compare this constraint with predictions of the hierarchical scenario, computed through Press-Schechter merger trees. We find evidence for elliptical systems which appear not to have been formed by a major merger of spirals.

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