Papers › The VANDELS survey: the star-formation histories of massive quiescent galaxies at 1.0 < z < 1.3
The VANDELS survey: the star-formation histories of massive quiescent galaxies at 1.0 < z < 1.3
A. C. Carnall, R. J. McLure, J. S. Dunlop, F. Cullen, D. J. McLeod, V. Wild, B. D. Johnson, S. Appleby, R. Davé, R. Amorin, M. Bolzonella, M. Castellano, A. Cimatti, O. Cucciati, A. Gargiulo, B. Garilli, F. Marchi, L. Pentericci, L. Pozzetti, C. Schreiber, M. Talia, G. Zamorani
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We present a Bayesian full-spectral-fitting analysis of 75 massive (M_* > 10^(10.3) M_⊙) UVJ-selected galaxies at redshifts of 1.0 < z < 1.3, combining extremely deep rest-frame ultraviolet spectroscopy from VANDELS with multi-wavelength photometry. By the use of a sophisticated physical plus systematic uncertainties model, constructed within the Bagpipes code, we place strong constraints on the star-formation histories (SFHs) of individual objects. We firstly constrain the stellar mass vs stellar age relationship, finding a steep trend towards earlier average formation with increasing stellar mass of 1.48^(+0.34)_(-0.39) Gyr per decade in mass, although this shows signs of flattening at M_* > 10¹¹ M_⊙. We show that this is consistent with other spectroscopic studies from 0 < z < 2. This relationship places strong constraints on the AGN-feedback models used in cosmological simulations. We demonstrate that, although the relationships predicted by Simba and IllustrisTNG agree well with observations at z=0.1, they are too shallow at z=1, predicting an evolution of <0.5 Gyr per decade in mass. Secondly, we consider the connections between green-valley, post-starburst and quiescent galaxies, using our inferred SFH shapes and the distributions of galaxy physical properties on the UVJ diagram. The majority of our lowest-mass galaxies (M_* ∼10^(10.5) M_⊙) are consistent with formation in recent (z<2), intense starburst events, with timescales of ≲500 Myr. A second class of objects experience extended star-formation epochs before rapidly quenching, passing through both green-valley and post-starburst phases. The most massive galaxies in our sample are extreme systems: already old by z=1, they formed at z∼5 and quenched by z=3. However, we find evidence for their continued evolution through both AGN and rejuvenated star-formation activity.
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