Affiliation: Instituto de Astrofísica de Canarias (IAC)

Contribution: Oral

Title: The emergence of the Hubble Sequence as seen by COSMOS-Web

Abstract: JWST has provided a new window into the rest-frame optical emission of the first galaxies. A variety of works have shown that Hubble type morphologies seem to emerge in massive galaxies very early in the history of the universe including the presence of tracers of cold stellar disks such as stellar bars as early as z ∼ 3. This is somehow surprising given the expected high gas fractions and merger rates at these very early epochs. Although the exact nature of these galaxies is difficult to establish without kinematics measurements, these purely morphological measurements seem to suggest a very rapid mass assembly at cosmic dawn, also in agreement with over abundance of UV bright galaxies. In this work we take advantage of the wide area coverage of the COSMOS-Web survey to quantify the stellar mass functions of different morphological types from z ∼ 0.5 to z ∼ 7 with the best statistics up to date and put robust new constraints on the epoch of emergence of the Hubble sequence at different stellar mass scales. In a second step we use large foundation neural network models to statistically constrain the abundance of stellar bars as a function of time and constrain the abundance of stellar disks at cosmic dawn.

This contribution can be found here (pdf).