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The effect of non-sphericity on mass and anisotropy measurements in dSph galaxies with Schwarzschild method
Klaudia Kowalczyk, Ewa L. Lokas, Monica Valluri
In our previous work we confirmed the reliability of the spherically symmetric Schwarzschild orbit-superposition method to recover the mass and velocity anisotropy profiles of sphe…
Theia: Faint objects in motion or the new astrometry frontier
The Theia Collaboration, Celine Boehm, Alberto Krone-Martins +96
In the context of the ESA M5 (medium mission) call we proposed a new satellite mission, Theia, based on relative astrometry and extreme precision to study the motion of very faint…
Reliability of the measured velocity anisotropy of the Milky Way stellar halo
Kohei Hattori, Monica Valluri, Sarah R. Loebman +1
Determining the velocity distribution of halo stars is essential for estimating the mass of the Milky Way and for inferring its formation history. Since the stellar halo is a dynam…
Beta Dips in the Gaia Era: Simulation Predictions of the Galactic Velocity Anisotropy Parameter for Stellar Halos
Sarah R. Loebman, Monica Valluri, Kohei Hattori +7
The velocity anisotropy parameter, beta, is a measure of the kinematic state of orbits in the stellar halo which holds promise for constraining the merger history of the Milky Way…
On the orbits that generate the X-shape in the Milky Way bulge
Caleb Abbott, Monica Valluri, Juntai Shen +1
The Milky Way bulge shows a box/peanut or X-shaped bulge (hereafter BP/X) when viewed in infrared or microwave bands. We examine orbits in an N-body model of a barred disk galaxy t…
Recovering the mass profile and orbit anisotropy of mock dwarf galaxies with Schwarzschild modelling
Klaudia Kowalczyk, Ewa L. Lokas, Monica Valluri
We present a new study concerning the application of the Schwarzschild orbit superposition method to model spherical galaxies. The method aims to recover the mass and the orbit ani…