The VANDELS survey: the star-formation histories of massive quiescent galaxies at 1.0 < z < 1.3
arXiv:1903.11082 · doi:10.1093/mnras/stz2544
Abstract
We present a Bayesian full-spectral-fitting analysis of 75 massive () UVJ-selected galaxies at redshifts of , 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 Gyr per decade in mass, although this shows signs of flattening at . We show that this is consistent with other spectroscopic studies from . 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 , they are too shallow at , predicting an evolution of 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 () are consistent with formation in recent (), intense starburst events, with timescales of 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 , they formed at and quenched by . However, we find evidence for their continued evolution through both AGN and rejuvenated star-formation activity.
arXiv comment25 pages, 13 figures, MNRAS accepted
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