University of Hertfordshire

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Investigating the merger origin of early-type galaxies using ultra-deep optical images

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  • 906062

    Accepted author manuscript, 185 KB, PDF document

  • P.-A. Duc
  • F. Bournaud
  • E. Ferriere
  • J.-C. Cuillandre
  • K. Alatalo
  • L. Blitz
  • M. Bois
  • E. Emsellem
  • P.-Y. Lablanche
  • L. Michel-Dansac
  • M. Bureau
  • M. Cappellari
  • R.L. Davies
  • T.A. Davis
  • N. Scott
  • P. Côté
  • L. Ferrarese
  • S. Gwyn
  • L. MacArthur
  • P.T. De Zeeuw
  • And 11 others
  • D. Krajnovic
  • H. Kuntschner
  • S. Khochfar
  • R.M. McDermid
  • R. Morganti
  • T. Oosterloo
  • P. Serra
  • T. Naab
  • M. Sarzi
  • A. Weijmans
  • L.M. Young
View graph of relations
Original languageEnglish
Pages (from-to)238-241
Number of pages4
JournalProceedings of the International Astronomical Union
Publication statusPublished - 1 Dec 2010


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 ATLAS 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 in the g-band. Initial results for two galaxies are presented here.


Tracing the Ancestry of Galaxies (on the land of our ancestors) Proceedings IAU Symposium No. 277, 2010 C. Carignan, F. Combes & K.C. Freeman, eds.

ID: 555807