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Communication Dans Un Congrès Année : 2011

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

Maxime Bois
  • Fonction : Auteur
M. Bureau
  • Fonction : Auteur
Lisa M. Young
  • Fonction : Auteur

Résumé

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.

Dates et versions

hal-03744026 , version 1 (02-08-2022)

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Pierre-Alain Duc, Jean-Charles Cuillandre, Katherine Alatalo, Leo Blitz, Maxime Bois, et al.. Investigating the Merger Origin of Early-type Galaxies using Ultra-deep Optical Images. Tracing the ancestry of galaxies (on the land of our ancestors), IAU Symposium 277, Dec 2010, Ouagadougou, Burkina Faso, Burkina Faso. pp.238-241, ⟨10.1017/S174392131102285X⟩. ⟨hal-03744026⟩

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