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Galaxies 2015, 3(4), 202-211; doi:10.3390/galaxies3040202

Creating S0s with Major Mergers: A 3D View

1
Max Planck Institute for Astronomy, Königstuhl 17, Heidelberg D-69117, Germany
2
Departamento de Astrofísica y Ciencias de la Atmósfera, Universidad Complutense de Madrid, Madrid E-28040, Spain
3
Instituto de Astronomía, Universidad Nacional Autónoma de México, Ensenada BC-22800, Mexico
4
Instituto de Astrofísica de Canarias, C/ Vía Láctea, La Laguna E-38200, Tenerife, Spain
5
Kapteyn Astronomical Institute, University of Groningen, Postbus 800, Groningen NL-9700, The Netherlands
6
School of Physics and Astronomy, University St Andrews, North Haugh, St Andrews KY16 9SS, UK
*
Author to whom correspondence should be addressed.
Academic Editors: José Alfonso López Aguerri, Enrichetta Iodice and Alexei Moiseev
Received: 15 October 2015 / Revised: 23 November 2015 / Accepted: 25 November 2015 / Published: 3 December 2015
View Full-Text   |   Download PDF [3731 KB, uploaded 3 December 2015]   |  

Abstract

A number of simulators have argued that major mergers can sometimes preserve discs, but the possibility that they could explain the emergence of lenticular galaxies (S0s) has been generally neglected. In fact, observations of S0s reveal a strong structural coupling between their bulges and discs, which seems difficult to reconcile with the idea that they come from major mergers. However, in our recent papers we have used N-body simulations of binary mergers to show that, under favourable conditions, discs are first destroyed but soon regrow out of the leftover debris, matching observational photometric scaling relations. Additionally, we have shown how the merger scenario agrees with the recent discovery that S0s and most spirals are not compatible in an angular momentum–concentration plane. This important result from CALIFA constitutes a serious objection to the idea that spirals transform into S0s mainly by fading (e.g., via ram-pressure stripping, as that would not explain the observed simultaneous change in λ Re and concentration), but our simulations of major mergers do explain that mismatch. From such a 3D comparison we conclude that mergers must be a relevant process in the build-up of the current population of S0s. View Full-Text
Keywords: galaxies; lenticular; kinematics and dynamics; structure; evolution; interactions galaxies; lenticular; kinematics and dynamics; structure; evolution; interactions
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Querejeta, M.; Eliche-Moral, M.C.; Tapia, T.; Borlaff, A.; van de Ven, G.; Lyubenova, M.; Martig, M.; Falcón-Barroso, J.; Méndez-Abreu, J.; Zamorano, J.; Gallego, J. Creating S0s with Major Mergers: A 3D View. Galaxies 2015, 3, 202-211.

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