http://arxiv.org/abs/1910.07544
Massive quiescent galaxies at high redshift can shed light on the processes of galaxy mass assembly and quenching of the star formation at early epochs. We present observer-frame color-color diagrams designed to identify candidate quiescent galaxies from z=2.5 up to the highest redshifts, that can be then be selected for spectroscopic follow-up observations. The application to the COSMOS2015 catalog shows that, after refining the selection with SED fitting, the number of massive old quiescent galaxies exceeds the forecast of state-of-the-art semi-analytic models, pointing out the need of an improvement of the implemented quenching mechanisms at high redshifts.
G. Girelli, M. Bolzonella and A. Cimatti
Fri, 18 Oct 19
45/77
Comments: Astronomy & Astrophysics, accepted; 21 pages, 13 figures
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