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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Recent observations have revealed a trove of unexpected morphologicalfeatures in many of the Milky Way's stellar streams. Explanations for suchfeatures include time-dependent deformations of the Galactic gravitationalpotential, local disruptions induced by dark matter substructure, and specialconfigurations of the streams' progenitors. In this paper, we study how thesemorphologies can also arise in certain static, non-spherical gravitationalpotentials that host a subset of resonantly-trapped orbit families. Thetransitions, or separatrices, between these orbit families mark abruptdiscontinuities in the orbital structure of the potential. We develop a novelnumerical approach for measuring the libration frequencies of resonant andnear-resonant orbits, and apply it to study the evolution of stellar streams onthese orbits. We reveal two distinct morphological features that arise instreams on near-resonant orbits: fans, that come about due to a large spread inthe libration frequencies near a separatrix; and bifurcations, that arise whena separatrix splits the orbital distribution of the stellar stream between two(or more) distinct orbit families. We demonstrate that these effects can arisein some Milky Way streams for certain choices of the dark matter halopotential, and discuss how this might be used to probe and constrain the globalshape of the Milky Way's gravitational potential.

Stream Fanning and Bifurcations: Observable Signatures of Resonances in Stellar Stream Morphology