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Galactic bulges: the importance of early formation scenarios vs. secular evolution

Published online by Cambridge University Press:  09 February 2015

Marja K. Seidel ,
R. Cacho ,
T. Ruiz-Lara ,
J. Falcón-Barroso ,
I. Pérez ,
P. Sánchez-Blázquez ,
F. P. A. Vogt ,
M. Ness ,
K. Freeman  and
S. Aniyan
Marja K. Seidel
Affiliation:
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain email: [email protected]
R. Cacho
Affiliation:
Dpto. de Astrofísica y CC. de la Atmósfera, Universidad Complutense de Madrid, Spain
T. Ruiz-Lara
Affiliation:
Dpto. de Física Teórica y del Cosmos, Universidad de Granada, Facultad de Ciencias (Edificio Mecenas), 18071 Granada, Spain Instituto Universitario Carlos I de Física Teórica y Computacional, Universidad de Granada, 18071 Granada, Spain
J. Falcón-Barroso
Affiliation:
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain email: [email protected]
I. Pérez
Affiliation:
Dpto. de Física Teórica y del Cosmos, Universidad de Granada, Facultad de Ciencias (Edificio Mecenas), 18071 Granada, Spain Instituto Universitario Carlos I de Física Teórica y Computacional, Universidad de Granada, 18071 Granada, Spain
P. Sánchez-Blázquez
Affiliation:
Dpto. de Física Teórica, Universidad Autónoma de Madrid, E-28049 Cantoblanco, Spain
F. P. A. Vogt
Affiliation:
Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia
M. Ness
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
K. Freeman
Affiliation:
Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia
S. Aniyan
Affiliation:
Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany
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Abstract

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We study the stellar content of three galactic bulges with the high resolution gratings (R=7000) of the WiFeS integral field unit in order to better understand their formation and evolution. In all cases we find that at least 50% of the stellar mass already existed 12 Gyrs ago, more than currently predicted by simulations. A younger component (age between ∼1 to ∼8 Gyrs) is also prominent and its present day distribution seems to be much more affected by morphological structures, especially bars, than the older one. This in-depth analysis supports the notion of increasing complexity in bulges which cannot be achieved by mergers alone, but requires a non-negligible contribution from secular evolution.

Keywords

galaxies: individual (NGC 5701, NGC 6753, NGC 7552)galaxies: bulgesgalaxies: evolutiongalaxies: kinematics and dynamicsgalaxies: stellar contenttechniques: spectroscopic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S309: Galaxies in 3D across the Universe , July 2014 , pp. 163 - 164
Copyright
Copyright © International Astronomical Union 2015 

References

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