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|Title:||The most massive, passive, and oldest galaxies at 0.5 < z < 2.1: Downsizing signature from galaxies selected from MgUV index||Authors:||Thomas, R.
Le Fèvre, O.
Lemaux, B. C.
CASSARA, LETIZIA PASQUA
|Issue Date:||2019||Journal:||ASTRONOMY & ASTROPHYSICS||Number:||630||First Page:||A145||Abstract:||Aims: We seek is to identify old and massive galaxies at 0.5 < z < 2.1 on the basis of the magnesium index Mg<SUB>UV</SUB> and then study their physical properties. <BR /> Methods: We computed the Mg<SUB>UV</SUB> index based on the best spectral fitting template of ∼3700 galaxies using data from the VLT VIMOS Deep Survey (VVDS) and VIMOS Ultra Deep Survey (VUDS) galaxy redshift surveys. Based on galaxies with the largest signal to noise and the best fit spectra we selected 103 objects with the highest spectral Mg<SUB>UV</SUB> signature. We performed an independent fit of the photometric data of these galaxies and computed their stellar masses, star formation rates, extinction by dust and age, and we related these quantities to the Mg<SUB>UV</SUB> index. <BR /> Results: We find that the Mg<SUB>UV</SUB> index is a suitable tracer of early-type galaxies at an advanced stage of evolution. Selecting galaxies with the highest Mg<SUB>UV</SUB> index allows us to choose the most massive, passive, and oldest galaxies at any epoch. The formation epoch t<SUB>f</SUB> computed from the fitted age as a function of the total mass in stars supports the downsizing formation paradigm in which galaxies with the highest mass formed most of their stars at an earlier epoch. <P />Based on data obtained with the European Southern Observatory Very Large Telescope, Paranal, Chile, under Large Programmes 070.A-9007 and 177.A-0837. Based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/DAPNIA, at the Canada-France-Hawaii Telescope (CFHT) which is operated by the National Research Council (NRC) of Canada, the Institut National des Sciences de l'Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This work is based in part on data products produced at TERAPIX and the Canadian Astronomy Data Centre as part of the CFHT Legacy Survey, a collaborative project of NRC and CNRS.||URI:||http://hdl.handle.net/20.500.12386/30592||URL:||https://www.aanda.org/articles/aa/full_html/2019/10/aa35813-19/aa35813-19.html||ISSN:||0004-6361||DOI:||10.1051/0004-6361/201935813||Bibcode ADS:||2019A&A...630A.145T||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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