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The Dark Halo – Spheroid Conspiracy Reloaded: Evolution with Redshift

Published online by Cambridge University Press:  10 April 2015

Rhea-Silvia Remus ,
Klaus Dolag  and
Andreas Burkert
Rhea-Silvia Remus
Affiliation:
Universitäts-Sternwarte München, Scheinerstr. 1, D-81679 München, Germany
Klaus Dolag
Affiliation:
Universitäts-Sternwarte München, Scheinerstr. 1, D-81679 München, Germany MPI for Astrophysics, Karl-Schwarzschild Strasse 1, D-85748 Garching, Germany
Andreas Burkert
Affiliation:
Universitäts-Sternwarte München, Scheinerstr. 1, D-81679 München, Germany MPI for Extraterrestrial Physics, Giessenbachstrasse 1, D-85748 Garching, Germany email: rhea@usm.lmu.de
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Abstract

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The total density profiles of elliptical galaxies can be fit by a single power law, i.e., ρtot ∝ rγ with γ ≈ −2. While strong lensing observations show a tendency for the slopes to become flatter with increasing redshift, simulations indicate an opposite trend. To understand this discrepancy, we study a set of simulated spheroids formed within the cosmological framework. From our simulations we find that the steepness of the total density slope correlates with the compactness of the stellar component within the half-mass radius, and that spheroidal galaxies tend to be more compact at high redshifts than their present-day counterparts. While both these results are in agreement with observations, the observed trend of the total density slope with redshift remains in contradiction to the results from simulations.

Keywords

galaxies: elliptical – galaxies: evolution – galaxies: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S311: Galaxy Masses as Constraints of Formation Models , July 2014 , pp. 116 - 119
Copyright
Copyright © International Astronomical Union 2015 

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