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The formation and build-up of the red-sequence over the past 9 Gyr in VIPERS

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2015

Publication Year

2020-03-27T13:39:59Z

Acceptance in OA@INAF

The formation and build-up of the red-sequence over the past 9 Gyr in VIPERS

Title

Fritz, Alexander; ABBAS, Ummi; Adami, C.; Arnouts, S.; Bel, J.; et al.

Authors

10.1017/S1743921314010096

DOI

http://hdl.handle.net/20.500.12386/23642

Handle

PROCEEDINGS OF THE INTERNATIONAL ASTRONOMICAL UNION

Series

vol. 10, S309

Number

(2)

Galaxies in 3D across the Universe Proceedings IAU Symposium No. 309, 2014

B. L. Ziegler, F. Combes, H. Dannerbauer, M. Verdugo, eds.

c

 International Astronomical Union 2015

doi:10.1017/S1743921314010096

The formation and build-up of the

red-sequence over the past 9 Gyr in VIPERS

Alexander Fritz

1

and the VIPERS Team

2

1

INAF - IASF Milano, Via E. Bassini 15, 20133 Milano, Italy email: afritz@iasf-milano.inaf.it

2

The VIPERS Team: U. Abbas, C. Adami, S. Arnouts, J. Bel, M. Bolzonella, D. Bottini, E. Branchini, A. Burden, A. Cappi, J. Coupon, O. Cucciati, I. Davidzon, G. De Lucia, S. de la Torre, C. Di Porto, P. Franzetti, M. Fumana, B. Garilli, B. R. Granett, L. Guzzo, O. Ilbert, A.

Iovino, J. Krywult, V. Le Brun, O. Le F`evre, D. Maccagni, K. Malek, A. Marchetti, C. Marinoni, F. Marulli, H. J. McCracken, Y. Mellier, L. Moscardini, R. C. Nichol, L. Paioro, J. A. Peacock, W. J. Percival, M. Polletta, A. Pollo, M. Scodeggio, L. A. M. Tasca, R. Tojeiro,

D. Vergani, G. Zamorani and A. Zanichelli; Web address: http://vipers.inaf.it

Abstract. We present the Luminosity Function (LF) and Colour-Magnitude Relation (CMR)

using∼45000 galaxies drawn from the VIMOS Public Extragalactic Redshift Survey (VIPERS). Using different selection criteria, we define several samples of early-type galaxies and explore their impact on the evolution of the red-sequence (RS) and the effects of dust. Our results suggest a rapid build-up of the RS within a short time scale. We find a rise in the number density of early-type galaxies and a strong evolution in LF and CMR. Massive galaxies exist already 9 Gyr ago and experience an efficient quenching of their star formation at z = 1, followed by a passive evolution with only limited merging activity. In contrast, low-mass galaxies indicate a different mass assembly history and cause a slow build-up of the CMR over cosmic time.

Keywords. Galaxy Surveys - Galaxies: evolution - Galaxies: formation - Galaxies: statistics

1. The Evolution of Early-Type Galaxies Since z = 1.3

The VIMOS Public Extragalactic Redshift Survey (VIPERS) is mapping out the Uni-verse at 0.5<z<1.2 using spectroscopic redshifts of 100k galaxies with IA B < 22.5 in two sky regions over 24 deg2. Based on complementary precise UV to IR photometry, this

unique dataset provides unprecedented detail on the statistical properties of galaxies and evolution of structure at intermediate redshifts (Guzzo et al. 2014; Garilli et al. 2014).

We examine the evolution of the Colour-Magnitude Relation (CMR) and Luminosity Function (LF) in VIPERS using ∼45000 galaxies between 0.4  z  1.3 over 10.32 deg2 (Fritz et al. 2014). Independent from the selection criteria to define early-type galaxies, we find a rise in the number density and a strong evolution in the LF and CMR since z = 1.3. Dusty red galaxies show a mild evolution up to z = 1 and the effects of dust obscuration become more prominent at z > 1.3. Stellar population properties and their modelling favour a rapid build-up of the red-sequence within ∼1.5 Gyr. Massive galaxies are already assembled at z = 1 and experience a rapid star formation (SF) quenching without significant subsequent dry mergers. Low-massive galaxies indicate a more complex mass assembly with a combination of SF quenching and minor mergers that slowly build-up of the faint- and intermediate-luminosity end of the CMR.

References

Fritz, A., Scodeggio, M., Ilbert, O., et al. 2014, A&A, 563, A92 Garilli, B., Guzzo, L., Scodeggio, M., et al. 2014, A&A, 562, A23 Guzzo, L., Scodeggio, M., Garilli, B., et al. 2014, A&A, 566, A108

313

https://www.cambridge.org/core/terms. https://doi.org/10.1017/S1743921314010096

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