Investigating the growing population of massive quiescent galaxies at cosmic noon
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ABSTRACTWe explore the build-up of quiescent galaxies using a sample of 28469 massive (M 1011M) galaxies at redshifts 1.5 > $z$ > 3.0, drawn from a 17.5deg2 area (0.33 Gpc3 comoving volume at these redshifts). This allows for a robust study of the quiescent fraction as a function of mass at 1.5 > $z$ > 3.0 with a sample 40times larger at log(M/$ m M_{odot })ge 11.5$ than previous studies. We derive the quiescent fraction using three methods: specific star formation rate, distance from the main sequence, and UVJ colourcolour selection. All three methods give similar values at 1.5 > $z$ > 2.0, however the results differ by up to a factor of 2 at 2.0 > $z$ > 3.0. At redshifts 1.5 > $z$ > 3.0, the quiescent fraction increases as a function of stellar mass. By $z$ = 2, only 3.3Gyr after the big bang, the universe has quenched 25percent of M = 1011M galaxies and 45percent of M = 1012M galaxies. We discuss physical mechanisms across a range of epochs and environments that could explain our results. We compare our results with predictions from hydrodynamical simulations SIMBA and IllustrisTNG and semi-analytic models (SAMs) SAG, SAGE, and Galacticus. The quiescent fraction from IllustrisTNG is higher than our empirical result by a factor of 25, while those from SIMBA and the three SAMs are lower by a factor of 1.510 at 1.5 > $z$ > 3.0.
Sherman, S., Jogee, S., Florez, J., Stevans, M. L., Kawinwanichakij, L., Wold, I., ... Vega-Martinez, C. A.
complete list of authors
Sherman, Sydney||Jogee, Shardha||Florez, Jonathan||Stevans, Matthew L||Kawinwanichakij, Lalitwadee||Wold, Isak||Finkelstein, Steven L||Papovich, Casey||Ciardullo, Robin||Gronwall, Caryl||Cora, Sofia A||Hough, Tomas||Vega-Martinez, Cristian A
