59 citations · 198 across the 11 of their papers we have counts for
11 papers
How to Flip a Bar
Angela Collier, Ann-Marie Madigan
Galactic bars, made up of elongated and aligned stellar orbits, can lose angular momentum via resonant torques with dark matter particles in the halo and slow down. Here we show th…
Bar-driven Leading Spiral Arms in a Counter-rotating Dark Matter Halo
Emma Lieb, Angela Collier, Ann-Marie Madigan
An overwhelming majority of galactic spiral arms trail with respect to the rotation of the galaxy, though a small sample of leading spiral arms has been observed. The formation of…
Central Dynamics of Multi-mass Rotating Star Clusters
Maria Tiongco, Angela Collier, Anna Lisa Varri
We investigate the evolutionary nexus between the morphology and internal kinematics of the central regions of collisional, rotating, multi-mass stellar systems, with special atten…
A Lopsided Outer Solar System
Alexander Zderic, Maria Tiongco, Angela Collier +3
Axisymmetric disks of eccentric orbits in near-Keplerian potentials are unstable to an out-of-plane buckling. Recently, Zderic et al. (2020) showed that an idealized disk saturates…
The Coupling of Galactic Dark Matter Halos with Stellar Bars
Angela Collier, Ann-Marie Madigan
Resonant torques couple stellar bars to dark matter halos. Here we use high-resolution numerical simulations to demonstrate long-term angular momentum transfer between stellar bars…
Apsidal Clustering following the Inclination Instability
Alexander Zderic, Angela Collier, Maria Tiongco +1
Disks of low-mass bodies on high-eccentricity orbits in near-Keplerian potentials can be dynamically unstable to buckling out of the plane. In this letter, we present -body simu…