Speaker
Description
Local scaling relations of disc galaxies contain key information on the different physical processes that regulate their formation and evolution. While these relations are well established at z=0, their physical origin and evolution across cosmic time remain poorly constrained.
We present a new and unique radially resolved semi-analytic model for the evolution of star-forming disc galaxies, that self-consistently captures the coupled growth of baryons, angular momentum and dark matter. The model incorporates gas accretion, conservation and redistribution of angular momentum, radial flows, star formation, together with an evolving dark matter halo and circumgalactic medium (CGM). With this we can track the evolution of the radial structure, kinematics, and the angular momentum distribution of different components including the disc, CGM and dark matter halo.
To constrain the parameters of model, we use local scaling relations: the baryonic Tully-Fisher relation, the relation between the specific angular momentum, baryonic mass and gas fraction, and the stellar size-mass relation. As a result of this calibration, the model successfully reproduces other key scaling relations of local disc galaxies: the star formation main sequence, the stellar-to-halo mass relation, and the stellar Tully–Fisher relation. Furthermore, the model successfully predicts an inside-out growth of galaxies and extended gas discs relative to stars. It further allows for making predictions on the emergence and evolution of these fundamental scaling relations across cosmic time, representing an important tool for interpreting properties of high-z galaxies that have been obtained in the past years through ALMA observations.
| Talk category | NOVA Network 1 |
|---|---|
| PhD relevance | 1st |
