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Creating lenticular galaxies with mergers

Published online by Cambridge University Press:  21 March 2017

Miguel Querejeta ,
M. Carmen Eliche-Moral ,
Trinidad Tapia ,
Alejandro Borlaff ,
Glenn van de Ven ,
Mariya Lyubenova ,
Marie Martig ,
Jesús Falcón-Barroso ,
Jairo Méndez-Abreu  and
Jaime Zamorano
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Miguel Querejeta
Affiliation:
Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany
M. Carmen Eliche-Moral
Affiliation:
Departamento de Astrofísica, Universidad Complutense de Madrid, E-28040 Madrid, Spain
Trinidad Tapia
Affiliation:
Instituto de Astronomía, UNAM, BC-22800 Ensenada, Mexico
Alejandro Borlaff
Affiliation:
Instituto de Astrofísica de Canarias, C/ Vía Láctea, E-38200 La Laguna, Tenerife, Spain
Glenn van de Ven
Affiliation:
Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany
Mariya Lyubenova
Affiliation:
Kapteyn Institute, University of Groningen, NL-9700 Groningen, The Netherlands
Marie Martig
Affiliation:
Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany
Jesús Falcón-Barroso
Affiliation:
Instituto de Astrofísica de Canarias, C/ Vía Láctea, E-38200 La Laguna, Tenerife, Spain
Jairo Méndez-Abreu
Affiliation:
School of Physics and Astronomy, University St Andrews, KY16 9SS, St Andrews, UK
Jaime Zamorano
Affiliation:
Departamento de Astrofísica, Universidad Complutense de Madrid, E-28040 Madrid, Spain
Jesús Gallego
Affiliation:
Departamento de Astrofísica, Universidad Complutense de Madrid, E-28040 Madrid, Spain
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Abstract

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Lenticular galaxies (S0s) represent the majority of early-type galaxies in the local Universe, but their formation channels are still poorly understood. While galaxy mergers are obvious pathways to suppress star formation and increase bulge sizes, the marked parallelism between spiral and lenticular galaxies (e.g. photometric bulge–disc coupling) seemed to rule out a potential merger origin. Here, we summarise our recent work in which we have shown, through N-body numerical simulations, that disc-dominated lenticulars can emerge from major mergers of spiral galaxies, in good agreement with observational photometric scaling relations. Moreover, we show that mergers simultaneously increase the light concentration and reduce the angular momentum relative to their spiral progenitors. This explains the mismatch in angular momentum and concentration between spirals and lenticulars recently revealed by CALIFA observations, which is hard to reconcile with simple fading mechanisms (e.g. ram-pressure stripping).

Keywords

galaxies: elliptical and lenticulargalaxies: structuregalaxies: evolutiongalaxies: interactionsgalaxies: kinematics and dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S321: Formation and Evolution of Galaxy Outskirts , March 2016 , pp. 114 - 116
Copyright
Copyright © International Astronomical Union 2017 

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