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|Title:||The evolving star formation rate: M<SUB>⋆</SUB> relation and sSFR since z ≃ 5 from the VUDS spectroscopic survey||Authors:||Tasca, L. A. M.
Le Fèvre, O.
Hathi, N. P.
Lemaux, B. C.
GARILLI, BIANCA MARIA ROSA
Le Brun, V.
Cassarà, L. P.
de la Torre, S.
Wang, P. W.
|Issue Date:||2015||Journal:||ASTRONOMY & ASTROPHYSICS||Number:||581||First Page:||A54||Abstract:||We study the evolution of the star formation rate (SFR) - stellar mass (M<SUB>⋆</SUB>) relation and specific star formation rate (sSFR) of star-forming galaxies (SFGs) since a redshift z ≃ 5.5 using 2435 (4531) galaxies with highly reliable spectroscopic redshifts in the VIMOS Ultra-Deep Survey (VUDS). It is the first time that these relations can be followed over such a large redshift range from a single homogeneously selected sample of galaxies with spectroscopic redshifts. The log (SFR) - log (M<SUB>⋆</SUB>) relation for SFGs remains roughly linear all the way up to z = 5, but the SFR steadily increases at fixed mass with increasing redshift. We find that for stellar masses M<SUB>⋆</SUB> ≥ 3.2 × 10<SUP>9</SUP>M<SUB>☉</SUB> the SFR increases by a factor of ~13 between z = 0.4 and z = 2.3. Weextend this relation up to z = 5, finding an additional increase in SFR by a factor of 1.7 from z = 2.3 to z = 4.8 for masses M<SUB>⋆</SUB> ≥ 10<SUP>10</SUP>M<SUB>☉</SUB>. We observe a turn-off in the SFR-M<SUB>⋆</SUB> relation at the highest mass end up to a redshift z ~ 3.5. We interpret this turn-off as the signature of a strong on-going quenching mechanism and rapid mass growth. The sSFR increases strongly up to z ~ 2, but it grows much less rapidly in 2 <z< 5. We find that the shape of the sSFR evolution is not well reproduced by cold gas accretion-driven models or the latest hydrodynamical models. Below z ~ 2 these models have a flatter evolution (1 + z)<SUP>Φ</SUP> with Φ = 2 - 2.25 compared to the data which evolves more rapidly with Φ = 2.8 ± 0.2. Above z ~ 2, the reverse is happening with the data evolving more slowly with Φ = 1.2 ± 0.1. The observed sSFR evolution over a large redshift range 0 <z< 5 and our finding of a non-linear main sequence at high mass both indicate that the evolution of SFR and M<SUB>⋆</SUB> is not solely driven by gas accretion. The results presented in this paper emphasize the need to invoke a more complex mix of physical processes including major and minor merging to further understand the co-evolution of the SFR and stellar mass growth. <P />Based on data obtained with the European Southern Observatory Very Large Telescope, Paranal, Chile, under Large Program 185.A-0791.||Acknowledgments:||We thank the ESO staff for their continuous support for the VUDS survey, particularly the Paranal staff conducting the observations and Marina Rejkuba and the ESO user support group in Garching. This work is supported by funding from the European Research Council Advanced Grant ERC-2010-AdG-268107-EARLY and by INAF Grants PRIN 2010, PRIN 2012 and PICS 2013. A.C., O.C., M.T. and V.S. acknowledge the grant MIUR PRIN 2010–2011. This work is based on data products made available at the CESAM data center, Laboratoire d’Astrophysique de Marseille. This work partly uses 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.||URI:||http://hdl.handle.net/20.500.12386/23504||URL:||https://www.aanda.org/articles/aa/abs/2015/09/aa25379-14/aa25379-14.html||ISSN:||0004-6361||DOI:||10.1051/0004-6361/201425379||Bibcode ADS:||2015A&A...581A..54T||Fulltext:||restricted|
|Appears in Collections:||1.01 Articoli in rivista|
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