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Journal Club
The first quenched galaxies, when and how?
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Europe/Rome
0/0-3 - Sala Rosino (Dipartimento di Fisica e Astronomia - Edificio ex-Rizzato)
Description
Speakers: Alina Ikhsanova (Università degli Studi di Padova)
Many quenched galaxies discovered in the early Universe by \textit{JWST} raise fundemental question s on when and how these galaxies became quiescent. Making use of the latest version of the semi-analytic model GAEA that provides good agreement with the observed quenched fractions up to z∼3, we make predictions for the expected fractions of quiescent galaxies up to z∼7 and analyze the main quenching mechanism. We find that in a simulated box of 685 Mpc on a side, the first quenched massive (M⋆∼1011M⊙), Milky Way mass, and low mass (M⋆∼109.5M⊙ ) galaxies appear at z∼4.5, z∼6.2, and before z=7. Most quenched galaxies identified at early redshifts remain quenched for more than 1 Gyr. Independently of galaxy stellar mass, the dominant quenching mechanism at high redshift is accretion disk feedback (quasar winds) from a central massive black hole, which is triggered by mergers in massive and Milky Way mass galaxies, and by disk instabilities in low-mass galaxies. Environmental stripping become increasingly more important at lower redshift.
