Timing the earliest quenching events with a robust sample of massive quiescent galaxies at 2 < z < 5

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dc.contributor.authorJarvis, M
dc.contributor.authorCarnall, A
dc.contributor.authorWalker, S
dc.date.accessioned2021-02-10T14:37:15Z
dc.date.available2021-02-10T14:37:15Z
dc.date.issued2020-06-04
dc.description.abstractWe present a sample of 151 massive (M∗ > 1010 M) quiescent galaxies at 2 <z< 5, based on a sophisticated Bayesian spectral energy distribution fitting analysis of the CANDELS UDS and GOODS-South fields. Our sample includes a robust sub-sample of 61 objects for which we confidently exclude low-redshift and star-forming solutions. We identify 10 robust objects at z > 3, of which 2 are at z > 4. We report formation redshifts, demonstrating that the oldest objects formed at z > 6; however, individual ages from our photometric data have significant uncertainties, typically ∼0.5 Gyr. We demonstrate that the UVJ colours of the quiescent population evolve with redshift at z > 3, becoming bluer and more similar to post-starburst galaxies at lower redshift. Based upon this, we construct a model for the time evolution of quiescent galaxy UVJ colours, concluding that the oldest objects are consistent with forming the bulk of their stellar mass at z ∼ 6–7 and quenching at z ∼ 5. We report spectroscopic redshifts for two of our objects at z = 3.440 and 3.396, which exhibit extremely weak Ly α emission in ultra-deep VANDELS spectra. We calculate star formation rates based on these line fluxes, finding that these galaxies are consistent with our quiescent selection criteria, provided their Ly α escape fractions are >3 and >10 per cent, respectively. We finally report that our highest redshift robust object exhibits a continuum break at λ ∼ 7000 Å in a spectrum from VUDS, consistent with our photometric redshift of zphot = 4.72+0.06 −0.04. If confirmed as quiescent, this object would be the highest redshift known quiescent galaxy. To obtain stronger constraints on the times of the earliest quenching events, high-SNR spectroscopy must be extended to z 3 quiescent objectsen_US
dc.identifier.citationJarvis, M et al. 2020. Timing the earliest quenching events with a robust sample of massive quiescent galaxies at 2 < z < 5.Monthly Notices of the Royal Astronomical Society.496(1):695-707en_US
dc.identifier.urihttp://doi.org/10.1093/mnras/staa1535
dc.identifier.urihttp://hdl.handle.net/10566/5890
dc.language.isoenen_US
dc.publisherOxford University Pressen_US
dc.subjectmethods: statistical – galaxiesen_US
dc.subjectevolution – galaxiesen_US
dc.subjectstar formation.en_US
dc.titleTiming the earliest quenching events with a robust sample of massive quiescent galaxies at 2 < z < 5en_US

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