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http://hdl.handle.net/20.500.12386/26552
Title: | The VIMOS Public Extragalactic Redshift Survey (VIPERS). The distinct build-up of dense and normal massive passive galaxies | Authors: | GARGIULO, ADRIANA BOLZONELLA, MICOL SCODEGGIO, MARCO Krywult, J. DE LUCIA, GABRIELLA Guzzo, L. GARILLI, BIANCA MARIA ROSA Granett, B. R. de la Torre, S. ABBAS, Ummi Adami, C. Arnouts, S. BOTTINI, DARIO CAPPI, Alberto CUCCIATI, Olga Davidzon, I. FRANZETTI, PAOLO Fritz, A. Haines, C. Hawken, A. J. IOVINO, Angela Le Brun, V. Le Fèvre, O. Maccagni, D. Małek, K. Marulli, F. Moutard, T. POLLETTA, MARIA DEL CARMEN Pollo, A. Tasca, L. A. M. Tojeiro, R. VERGANI, DANIELA ZANICHELLI, Alessandra Zamorani, G. Bel, J. Branchini, E. Coupon, J. Ilbert, O. Moscardini, L. Peacock, J. A. |
Issue Date: | 2017 | Journal: | ASTRONOMY & ASTROPHYSICS | Number: | 606 | First Page: | A113 | Abstract: | We have used the final data from the VIPERS redshift survey to extract an unparalleled sample of more than 2000 massive ℳ≥10<SUP>11</SUP> M<SUB>☉</SUB> passive galaxies (MPGs) at redshift 0.5≤z≤1.0, based on their NUVrK colours. This has enabled us to investigate how the population of these objects was built up over cosmic time. We find that the evolution of the number density depends on the galaxy mean surface stellar mass density, Σ. In particular, dense (Σ≥2000 M<SUB>☉</SUB> pc<SUP>-2</SUP>) MPGs show a constant comoving number density over this redshift range, whilst this increases by a factor of approximately four for the least dense objects, defined as having Σ < 1000 M<SUB>☉</SUB> pc<SUP>-2</SUP>. We estimated stellar ages for the MPG population both fitting the spectral energy distribution (SED) and through the D4000<SUB>n</SUB> index, obtaining results in good agreement. Our findings are consistent with passive ageing of the stellar content of dense MPGs. We show that at any redshift the less dense MPGs are younger than dense ones and that their stellar populations evolve at a slower rate than predicted by passive evolution. This points to a scenario in which the overall population of MPGs was built up over the cosmic time by continuous addition of less dense galaxies: on top of an initial population of dense objects that passively evolves, new, larger, and younger MPGs continuously join the population at later epochs. Finally, we demonstrate that the observed increase in the number density of MPGs is totally accounted for by the observed decrease in the number density of correspondingly massive star forming galaxies (I.e. all the non-passive ℳ≥10<SUP>11</SUP> M<SUB>☉</SUB> objects). Such systems observed at z ≃ 1 in VIPERS, therefore, represent the most plausible progenitors of the subsequent emerging class of larger MPGs. <P />Based on observations collected at the European Southern Observatory, Cerro Paranal, Chile, using the Very Large Telescope under programs 182.A-0886 and partly 070.A-9007. Also 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 Canada-France-Hawaii Telescope Legacy Survey, a collaborative project of NRC and CNRS. The VIPERS web site is <A href="http://www.vipers.inaf.it/">http://www.vipers.inaf.it/</A> | URI: | http://hdl.handle.net/20.500.12386/26552 | URL: | https://www.aanda.org/articles/aa/abs/2017/10/aa30112-16/aa30112-16.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201630112 | Bibcode ADS: | 2017A&A...606A.113G | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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