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http://hdl.handle.net/20.500.12386/29904
Titolo: | The VANDELS survey: the star-formation histories of massive quiescent galaxies at 1.0 < z < 1.3 | Autori: | Carnall, A. C. McLure, R. J. Dunlop, J. S. Cullen, F. McLeod, D. J. Wild, V. Johnson, B. D. Appleby, S. Davé, R. Amorin, R. BOLZONELLA, MICOL CASTELLANO, MARCO Cimatti, A. CUCCIATI, Olga GARGIULO, ADRIANA GARILLI, BIANCA MARIA ROSA MARCHI, FRANCESCA PENTERICCI, Laura POZZETTI, Lucia Schreiber, C. Talia, M. Zamorani, G. |
Data pubblicazione: | 2019 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 490 | Fascicolo: | 1 | Da pagina:: | 417 | Abstract: | 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 multiwavelength 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 first constrain the stellar mass versus stellar age relationship, finding a steep trend towards earlier average formation time with increasing stellar mass (downsizing) of 1.48^{+0.34}_{-0.39} Gyr per decade in mass, although this shows signs of flattening at M_* > 10^{11} 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 time-scales 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. | URI: | http://hdl.handle.net/20.500.12386/29904 | URL: | https://academic.oup.com/mnras/article/490/1/417/5568380 https://arxiv.org/abs/1903.11082 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stz2544 | Bibcode ADS: | 2019MNRAS.490..417C | Fulltext: | open |
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