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Surfing on the bar: the formation of anti-truncated stellar disk profiles

Published online by Cambridge University Press:  21 March 2017

Jakob Herpich ,
Gregory S. Stinson ,
Aaron A. Dutton ,
Rix Hans-Walter  and
Marie Martig
Jakob Herpich
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany email: herpich@mpia.de
Gregory S. Stinson
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany email: herpich@mpia.de
Aaron A. Dutton
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany email: herpich@mpia.de New York University Abu Dhabi, PO Box 129188, Abu Dhabi, UAE
Rix Hans-Walter
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany email: herpich@mpia.de
Marie Martig
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany email: herpich@mpia.de
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Abstract

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The stellar radial profiles of disk galaxies are often observed to be truncated, or anti-truncated in the galaxies’ outskirts. As of now, the literature about galaxy formation lacks a model for the formation of observed anti-truncated stellar disks which is based on secular processes. We present an attempt to fill this gap. We were able to model anti-truncated disks in numerical SPH simulations of the formation of isolated galaxies. We will show that the stars in the outskirts of the simulated galactic disk are on very eccentric orbits but were formed on circular orbits at much smaller radii. We argue that a strong central bar is the main driver of the formation of such a disk configuration. The model predicts that such outer stellar disks should show very slow rotation, but high radial dispersion. If confirmed, their existence would constitute galaxy disks of qualitatively very new kinematic properties.

Keywords

galaxies: evolutiongalaxies: kinematics and dynamicsmethods: n-body simulations
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S321: Formation and Evolution of Galaxy Outskirts , March 2016 , pp. 78 - 80
Copyright
Copyright © International Astronomical Union 2017 

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