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Investigating the Merger Origin of Early-type Galaxies using Ultra-deep Optical Images

Published online by Cambridge University Press:  05 December 2011

P.-A. Duc
Affiliation:
AIM Paris-Saclay, France
J.-C. Cuillandre
Affiliation:
CFHT, USA
K. Alatalo
Affiliation:
University of California, Berkeley, USA
L. Blitz
Affiliation:
University of California, Berkeley, USA
M. Bois
Affiliation:
Observatoire de Lyon, France
F. Bournaud
Affiliation:
AIM Paris-Saclay, France
M. Bureau
Affiliation:
University of Oxford, UK
M. Cappellari
Affiliation:
University of Oxford, UK
P. Côté
Affiliation:
Herzberg Institute of Astrophysics, Victoria, Canada
R. L. Davies
Affiliation:
University of Oxford, UK
T. A. Davis
Affiliation:
University of Oxford, UK
P. T. de Zeeuw
Affiliation:
ESO, Garching, Germany Leiden University, The Netherlands
E. Emsellem
Affiliation:
Observatoire de Lyon, France ESO, Garching, Germany
L. Ferrarese
Affiliation:
Herzberg Institute of Astrophysics, Victoria, Canada
E. Ferriere
Affiliation:
AIM Paris-Saclay, France
S. Gwyn
Affiliation:
Herzberg Institute of Astrophysics, Victoria, Canada
S. Khochfar
Affiliation:
MPE, Garching, Germany
D. Krajnovic
Affiliation:
ESO, Garching, Germany
H. Kuntschner
Affiliation:
ESO, Garching, Germany
P.-Y. Lablanche
Affiliation:
Observatoire de Lyon, France
L. MacArthur
Affiliation:
Herzberg Institute of Astrophysics, Victoria, Canada
R. M. McDermid
Affiliation:
Gemini Observatory, Hilo, USA
L. Michel-Dansac
Affiliation:
Observatoire de Lyon, France
R. Morganti
Affiliation:
ASTRON, Dwingeloo, The Netherlands
T. Naab
Affiliation:
MPI, Garching, Germany
T. Oosterloo
Affiliation:
ASTRON, Dwingeloo, The Netherlands
M. Sarzi
Affiliation:
University of Hertfordshire, Hatfield, UK
N. Scott
Affiliation:
University of Oxford, UK
P. Serra
Affiliation:
ASTRON, Dwingeloo, The Netherlands
A. Weijmans
Affiliation:
Dunlap Institute for Astronomy & Astrophysics, University of Toronto, Canada
L. M. Young
Affiliation:
New Mexico Tech, Socorro, USA
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Abstract

The mass assembly of galaxies leaves various imprints on their surroundings, such as shells, streams and tidal tails. The frequency and properties of these fine structures depend on the mechanism driving the mass assembly: e.g. a monolithic collapse, rapid cold-gas accretion followed by violent disk instabilities, minor mergers or major dry/wet mergers. Therefore, by studying the outskirts of galaxies, one can learn about their main formation mechanism. I present here our on-going work to characterize the outskirts of Early-Type Galaxies (ETGs), which are powerful probes at low redshift of the hierarchical mass assembly of galaxies. This work relies on ultra–deep optical images obtained at CFHT with the wide-field of view MegaCam camera of field and cluster ETGs obtained as part of the ATLAS3D and NGVS projects. State of the art numerical simulations are used to interpret the data. The images reveal a wealth of unknown faint structures at levels as faint as 29 mag arcsec−2 in the g-band. Initial results for two galaxies are presented here.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2011

References

Bournaud, F., Duc, P.-A., & Emsellem, E. 2008, MNRAS, 389, L8CrossRefGoogle Scholar
Cappellari, M. et al. 2011, MNRAS, in press (arXiv:1012.1551)Google Scholar
Duc, P-A., et al. 2011, MNRAS, submittedGoogle Scholar
Elmegreen, B. G., & Bournaud, F. and Elmegreen, D. M. 2008, ApJ, 688, 67CrossRefGoogle Scholar
Emsellem, E., et al. , 2011, MNRAS, submittedGoogle Scholar
Martig, M. et al. 2009, ApJ, 707, 250CrossRefGoogle Scholar
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