English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The angular momentum of galaxies controls the kinematics of their stars,which in turn drives observable quantities such as the apparent radius, thebulge fraction, and the alignment with other nearby structures. To show howangular momentum of galaxies is determined, we build high (${35}\,\mathrm{pc}$)resolution numerical experiments in which we increase or decrease the angularmomentum of the Lagrangian patches in the early universe. We simulate threegalaxies over their histories from $z=200$ to $z=2$, each with five differentchoices for the angular momentum (fifteen simulations in total). Our resultsshow that altering early-universe angular momentum changes the timing andorbital parameters of mergers, which in turn changes the total stellar angularmomentum within a galaxy's virial radius in a predictable manner. Of our threegalaxies, one has no large satellite at $z=2$; in this case, the specificangular momentum is concentrated in the central galaxy. We modify its stellarangular momentum over $0.7\,\mathrm{dex}$ (from $61$ to$320\,\mathrm{kpc.km.s^{-1}}$) and show that this causes its effective radiusto grow by $40\,\%$, its $v/\sigma$ parameter to grow by a factor $\times 2.6$and its bulge fraction to decrease from $0.72$ to $0.57$. The ability tocontrol angular momentum will allow future studies to probe the causal originof scaling relations between galaxy mass, angular momentum and morphology, andto better understand the origin of galactic intrinsic alignments.

Stellar angular momentum can be controlled from cosmological initial conditions