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Galaxy Mass Assembly with VLT & HST and lessons for E-ELT/MOSAIC

Published online by Cambridge University Press:  09 February 2015

François Hammer ,
Hector Flores  and
Mathieu Puech
François Hammer
Affiliation:
GEPI, Observatoire de Paris5 Place Jules JanssenF-92 195Meudon, France email: francois.hammer@obspm.fr
Hector Flores
Affiliation:
GEPI, Observatoire de Paris5 Place Jules JanssenF-92 195Meudon, France email: francois.hammer@obspm.fr
Mathieu Puech
Affiliation:
GEPI, Observatoire de Paris5 Place Jules JanssenF-92 195Meudon, France email: francois.hammer@obspm.fr
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Abstract

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The fraction of distant disks and mergers is still debated, while 3D-spectroscopy is revolutionizing the field. However its limited spatial resolution imposes a complimentary HST imagery and a robust analysis procedure. When applied to observations of IMAGES galaxies at z = 0.4-0.8, it reveals that half of the spiral progenitors were in a merger phase, 6 billion year ago. The excellent correspondence between methodologically-based classifications of morphologies and kinematics definitively probes a violent origin of disk galaxies as proposed by Hammer et al. (2005). Examination of nearby galaxy outskirts reveals fossil imprints of such ancient merger events, under the form of well organized stellar streams. Perhaps our neighbor, M31, is the best illustration of an ancient merger, which modeling in 2010 leads to predict the gigantic plane of satellites discovered by Ibata et al. (2013). There are still a lot of discoveries to be done until the ELT era, which will open an avenue for detailed and accurate 3D-spectroscopy of galaxies from the earliest epochs to the present.

Keywords

galaxies: spiral - galaxies: evolution - galaxies: formation -galaxies: Local Group
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S309: Galaxies in 3D across the Universe , July 2014 , pp. 273 - 280
Copyright
Copyright © International Astronomical Union 2015 

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