ABSTRACTS OF ORAL PRESENTATIONS

    WITNESSING GALAXIES FATE SINCE THE END OF COSMIC DAWN: A STAR-FORMATION QUENCHING STORY - THIBAUD MOUTARD

    Well documented over ≥12 billion years (e.g. Davidson et al 2017), the continuous increase of the fraction of quiescent galaxies (where star formation has stopped) is the statistic expression of the quenching —i.e. the permanent shutdown— of star formation in galaxies. Such permanent quenching of the star formation requires, however, mechanisms able to suppress and prevent the cold-gas infall, which one may expect to vary depending on galaxies properties and environment.
    The diversity of quiescent galaxies (e.g. in terms of stellar mass and morphology) pleads indeed for the coexistence of different quenching channels since cosmic noon (Faber et al. 2007, Peng et al. 2010, Schawinski et al. 2014, Moutard et al. 2016b). At higher redshift, the physical processes which were at play in the early quenching of the very first quiescent galaxies a few 100Myrs after their formation (e.g. Chworowsky et al. 2023) are expected to be different again.
    I will present unprecedented analysis of the connection between the star formation quenching and the morphological transformation of galaxies since z ~ 7, drawing on the deepest, sharpest near- and mid-infrared observations ever conducted (even) with JWST (respectively, ~29 and 31mag at 3.6 and 5.6µm), as part of JADES (NIRCam & NIRSpec GTOs) and MIDIS (MIRI GTO), combined with ultra-deep HST imaging over the HUDF. I will characterise the co-evolution between galaxies sSFR and morphology through the green valley, depending on their stellar mass, and discuss the different quenching scenarii that our results support across cosmic time over the last ~13 billion years.

     

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