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

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1017/S174392131102285X
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Name affiliation
  1. National Research Council of Canada. NRC Herzberg Institute of Astrophysics
FormatText, Article
Proceedings titleTracing the Ancestry of Galaxies (on the land of our ancestors)
Series titleProceedings of the International Astronomical Union; Volume 6
ConferenceIAUS 277: Tracing the ancestry of galaxies (on the land of our ancestors), December 13-17, 2010, Ouagadougou, Burkina Faso
ISSN1743-9213
1743-9221
Pages238–241
Subjectgalaxies: formation; galaxies: evolution; galaxies: interactions; galaxies: elliptical and lenticular; cD
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.
Publication date
PublisherCambridge University Press
International Astronomical Union
LanguageEnglish
Peer reviewedYes
NPARC number21275860
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Record created2015-07-16
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