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The evolution of quiescent galaxies at high redshifts ( z ≥ 1 . 4 )
| Content Provider | Semantic Scholar |
|---|---|
| Author | Sánchez, H. Pozzi, Francesca Gruppioni, C. Cimatti, Andrea Ilbert, Olivier Pozzetti, Lucia Mccracken, H. J. Capak, Peter Floch, Edith Le Salvato, Mara Zamorani, Giovanni Carollo, C. Marcella Contini, Thierry Kneib, J.-P. Févre, Olivier Le Lilly, Simon J. Mainieri, V. Renzini, Alvio Scodeggio, Marco Bardelli, Sandro Bolzonella, Micol Bongiorno, Angela Caputi, K. Coppa, G. Cucciati, Olga Torre, Sylvain De La Ravel, L. De Franzetti, Paolo Garilli, Bianca Iovino, Angela Kampczyk, P. Knobel, Christian Kovac, Katarina Lamareille, Fabrice Borgne, J.-F. Le Brun, Vincent Le Maier, Christian W. Mignoli, Marco Pello, Roser Peng, Yong Pérez-Montero, Enrique Ricciardelli, Elisabetta Silverman, John D. Tanaka, Masayuki Taşcå, Luminiţa Tresse, Laurence Vergani, Daniela Zucca, Elena |
| Copyright Year | 2011 |
| Abstract | The goal of this work is to study the evolution of high-redshift (z ≥ 1.4) quiescent galaxies over an effective area of ∼1.7 deg2 in the COSMOS field. Galaxies have been divided according to their star formation activity and the evolution of the different populations, in particular of the quiescent galaxies, has been investigated in detail. We have studied an IRAC (mag3.6 μm < 22.0) selected sample of ∼18 000 galaxies at z ≥ 1.4 in the COSMOS field with multiwavelength coverage extending from the U band to the Spitzer 24 μm one. We have derived accurate photometric redshifts (σ z/(1+zs) = 0.06) through a SED-fitting procedure. Other important physical parameters [masses, ages and star formation rates (SFR)] of the galaxies have been obtained using Maraston models. We have divided our sample into actively star-forming, intermediate and quiescent galaxies depending on their specific star formation E-mail: helena.dominguez@oabo.inaf.it C © 2011 The Authors Monthly Notices of the Royal Astronomical Society C © 2011 RAS Quiescent galaxies at high redshifts 901 rate (SSFR = SFR/M). We have computed the galaxy stellar mass function (GSMF) of the total sample and the different populations at z = 1.4–3.0. We have studied the properties of highredshift quiescent galaxies finding that they are old (1–4 Gyr), massive (〈M〉 ∼ 1010.65 M ), weakly star-forming stellar populations with low dust extinction [E(B − V) ≤ 0.15] and small e-folding time-scales (τ ∼ 0.1–0.3 Gyr). We observe a significant evolution of the quiescent stellar mass function from 2.5 < z < 3.0 to 1.4 < z < 1.6, increasing by ∼1 dex in this redshift interval. We find that z ∼ 1.5 is an epoch of transition of the GSMF: while the GSMF at z 1.5 is dominated by the star-forming galaxies at all stellar masses, at z 1.5 the contribution to the total GSMF of the quiescent galaxies is significant and becomes higher than that of the star-forming population for M ≥ 1010.75 M . The fraction of star-forming galaxies decreases from 60–20 per cent from z ∼ 2.5–3.0 to 1.4–1.6 for M ∼ 1011.0 M , while the quiescent population increases from 10–50 per cent at the same redshift and mass intervals. We compare the fraction of quiescent galaxies derived with that predicted by theoretical models and find that the Kitzbichler & White model, implemented on the Millennium Simulation, is the one that better reproduces the shape of the data. Finally, we calculate the stellar mass density of the star-forming and quiescent populations as a function of redshift and find that there is already a significant number of quiescent galaxies at z > 2.5 (logρ [M Mpc−3] ∼ 6), meaning that efficient star formation had to take place before that time. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://authors.library.caltech.edu/28652/1/DominguezSanchez2011p16660Mon_Not_R_Astron_Soc.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Dex Evolution Extinction, Psychological GUCY2C protein, human Galaxy Mail (macOS) Mass Density Occur (action) Photometric stereo Photometry Population Redshift Sed Simulation Star Wars Galaxies Stellar (payment network) |
| Content Type | Text |
| Resource Type | Article |
