The Typical Massive Quiescent Galaxy at z ∼ 3 is a Post-starburst

C. D'Eugenio, E. Daddi, RAPHAEL ALEXANDRE SIMON GOBAT, V. Strazzullo, P. Lustig, I. Delvecchio, S. Jin, A. Puglisi, A. Calabró, C. Mancini, M. Dickinson, A. Cimatti, M. Onodera

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

18 Citas (Scopus)


We have obtained spectroscopic confirmation with Hubble Space Telescope WFC3/G141 of a first sizeable sample of nine quiescent galaxies at 2.4 < z < 3.3. Their average near-UV/optical rest-frame spectrum is characterized by low attenuation (AV ∼ 0.6 mag) and a strong Balmer break, larger than the 4000 break, corresponding to a fairly young age of ∼300 Myr. This formally classifies a substantial fraction of classically selected quiescent galaxies at z ∼ 3 as post-starbursts, marking their convergence to the quenching epoch. The rapid spectral evolution with respect to z ∼ 1.5 quiescent galaxies is not matched by an increase of residual star formation, as judged from the weak detection of [O ii]λ3727 emission, pointing to a flattening of the steep increase in gas fractions previously seen from z ∼ 0 to 1.8. However, radio 3 GHz stacked emission implies either much stronger dust-obscured star formation or substantial further evolution in radio-mode AGN activity with respect to z ∼ 1.5.

Idioma originalInglés
Número de artículoL2
PublicaciónAstrophysical Journal Letters
EstadoPublicada - 20 mar. 2020
Publicado de forma externa


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