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Counter-rotating disks in galaxies: dissecting kinematics and stellar populations with 3D spectroscopy

Published online by Cambridge University Press:  09 February 2015

Lodovico Coccato ,
Lorenzo Morelli ,
Alessandro Pizzella ,
Enrico Maria Corsini ,
Elena Dalla Bontà  and
Maximilian Fabricius
Lodovico Coccato
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Straβe 2, D-85748, Garching bei München, Germany
Lorenzo Morelli
Affiliation:
Dipartimento di Fisica ed Astronomia “Galileo Galilei“, Università di Padova, vicolo dell'Osservatorio 3, 35122 Padova, Italy. INAF-Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, 35122 Padova, Italy.
Alessandro Pizzella
Affiliation:
Dipartimento di Fisica ed Astronomia “Galileo Galilei“, Università di Padova, vicolo dell'Osservatorio 3, 35122 Padova, Italy. INAF-Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, 35122 Padova, Italy.
Enrico Maria Corsini
Affiliation:
Dipartimento di Fisica ed Astronomia “Galileo Galilei“, Università di Padova, vicolo dell'Osservatorio 3, 35122 Padova, Italy. INAF-Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, 35122 Padova, Italy.
Elena Dalla Bontà
Affiliation:
Dipartimento di Fisica ed Astronomia “Galileo Galilei“, Università di Padova, vicolo dell'Osservatorio 3, 35122 Padova, Italy. INAF-Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, 35122 Padova, Italy.
Maximilian Fabricius
Affiliation:
Max Planck Institute for Extraterrestrial Physics, Giessenbachstraβe, D-85748 Garching, Germany. University Observatory Munich, Scheinerstraβe 1, 81679 Munich, Germany. email: lcoccato@eso.org
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Abstract

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We present a spectral decomposition technique that separates the contribution of different kinematic components in galaxies from the observed spectrum. This allows to study the kinematics and properties of the stellar populations of the individual components (e.g., bulge, disk, counter-rotating cores, orthogonal structures). Here, we discuss the results of this technique for galaxies that host counter-rotating stellar disks of comparable size. In all the studied cases, the counter-rotating stellar disk is the less massive, the youngest and has different chemical content (metallicity and α-elements abundance ratio) than the main galaxy disk. Further applications of the spectral decomposition technique are also discussed.

Keywords

galaxies: elliptical and lenticular - galaxies: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S309: Galaxies in 3D across the Universe , July 2014 , pp. 133 - 136
Copyright
Copyright © International Astronomical Union 2015 

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