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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/27073
Title: VEGAS: A VST Early-type GAlaxy Survey. II. Photometric study of giant ellipticals and their stellar halos
Authors: SPAVONE, MARILENA 
CAPACCIOLI, Massimo
NAPOLITANO, NICOLA ROSARIO 
IODICE, ENRICHETTA 
GRADO, ANIELLO 
Limatola, Luca
Cooper, Andrew P.
CANTIELLO, Michele 
Forbes, Duncan A.
Paolillo, Maurizio 
SCHIPANI, Pietro 
Issue Date: 2017
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 603
First Page: A38
Abstract: Observations of diffuse starlight in the outskirts of galaxies are thought to be a fundamental source of constraint on the cosmological context of galaxy assembly in the ΛCDM model. Such observations are not trivial because of the extreme faintness of such regions. In this work, we investigated the photometric properties of six massive early-type galaxies (ETGs) in the VEGAS sample (NGC 1399, NGC 3923, NGC 4365, NGC 4472, NGC 5044, and NGC 5846) out to extremely low surface brightness levels with the goal of characterizing the global structure of their light profiles for comparison to state-of-the-art galaxy formation models. We carried out deep and detailed photometric mapping of our ETG sample taking advantage of deep imaging with VST/OmegaCAM in the g and I bands. By fitting the light profiles, and comparing the results to simulations of elliptical galaxy assembly, we have identified signatures of a transition between relaxed and unrelaxed accreted components and can constrain the balance between in situ and accreted stars. The very good agreement of our results with predictions from theoretical simulations demonstrates that the full VEGAS sample of 100 ETGs will allow us to use the distribution of diffuse light as a robust statistical probe of the hierarchical assembly of massive galaxies.
URI: http://hdl.handle.net/20.500.12386/27073
URL: https://www.aanda.org/articles/aa/abs/2017/07/aa29111-16/aa29111-16.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201629111
Bibcode ADS: 2017A&A...603A..38S
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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