Stellar angular momentum can be controlled from cosmological initial conditions
arXiv:2206.11913 · doi:10.1093/mnras/stac2858
Abstract
The angular momentum of galaxies controls the kinematics of their stars, which in turn drives observable quantities such as the apparent radius, the bulge fraction, and the alignment with other nearby structures. To show how angular momentum of galaxies is determined, we build high () resolution numerical experiments in which we increase or decrease the angular momentum of the Lagrangian patches in the early universe. We simulate three galaxies over their histories from to , each with five different choices for the angular momentum (fifteen simulations in total). Our results show that altering early-universe angular momentum changes the timing and orbital parameters of mergers, which in turn changes the total stellar angular momentum within a galaxy's virial radius in a predictable manner. Of our three galaxies, one has no large satellite at ; in this case, the specific angular momentum is concentrated in the central galaxy. We modify its stellar angular momentum over (from to ) and show that this causes its effective radius to grow by , its parameter to grow by a factor and its bulge fraction to decrease from to . The ability to control angular momentum will allow future studies to probe the causal origin of scaling relations between galaxy mass, angular momentum and morphology, and to better understand the origin of galactic intrinsic alignments.
8 pages, 3 figures. Submitted to MNRAS. Comments welcome
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