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We predict and compare the distributions and properties of hyper-velocity stars (HVSs) ejected from the centres of the Milky Way (MW) and the Large Magellanic Cloud (LMC). In our model, HVSs are ejected at a constant rate -- equal in both…

Astrophysics of Galaxies · Physics 2021-08-18 Fraser A. Evans , Tommaso Marchetti , Elena Maria Rossi , Josephine F. W. Baggen , Sanne Bloot

We derive general expressions for the LMC velocity field which we fit to kinematical data for 1041 carbon stars. We demonstrate that all previous studies of LMC kinematics have made unnecessary over-simplifications that have led to…

A solution is presented for the past motions of the Magellanic Clouds, the Milky Way galaxy, and M31, fitted to the measured velocities of the Clouds and M31, under some simplifying assumptions. The galaxies are modeled as isolated bodies…

Cosmology and Nongalactic Astrophysics · Physics 2009-07-31 P. J. E. Peebles

The SMC orbits within the LMC's dark matter (DM) halo in a $\sim$1:10 mass-ratio encounter. The LMC:Milky Way (MW) interaction is also $\sim$1:10, and is expected to perturb the MW's DM distribution. However, no framework exists to quantify…

In a companion paper by Koposov et al., RR Lyrae from \textit{Gaia} Data Release 2 are used to demonstrate that stars in the Orphan stream have velocity vectors significantly misaligned with the stream track, suggesting that it has received…

We investigate how the Large Magellanic Cloud (LMC) impacts the predicted signals in near-future direct detection experiments for non-standard dark matter (DM) interactions, using the Auriga cosmological simulations. We extract the local DM…

High Energy Physics - Phenomenology · Physics 2024-09-17 Javier Reynoso-Cordova , Nassim Bozorgnia , Marie-Cécile Piro

We investigate the non-adiabatic effect of time-dependent deformations in the Milky Way (MW) halo potential on stellar streams. Specifically, we consider the MW's response to the infall of the Large Magellanic Cloud (LMC) and how this…

Astrophysics of Galaxies · Physics 2024-06-25 Richard A. N. Brooks , Jason L. Sanders , Sophia Lilleengen , Michael S. Petersen , Andrew Pontzen

We compare the properties of gas flows on both the near and far side of the Large Magellanic Cloud (LMC) disk using Hubble Space Telescope UV absorption-line observations toward an AGN behind (transverse) and a star within (down-the-barrel)…

Astrophysics of Galaxies · Physics 2016-01-27 Kat Barger , Nicolas Lehner , J. Chris Howk

The Milky Way (MW) is a barred spiral galaxy shaped by tidal interactions with its satellites. The Large Magellanic Cloud (LMC) and the Sagittarius Dwarf galaxy (Sgr) are the dominant influences at the present day. This paper presents a…

Astrophysics of Galaxies · Physics 2024-11-15 Ioana A. Stelea , Jason A. S. Hunt , Kathryn V. Johnston

The rotation of the disk of the Large Magellanic Cloud (LMC) is derived from the radial velocities of 422 carbon stars. New aspects of this analysis include the propagation of uncertainties in the LMC proper motion with a Monte Carlo, and a…

Astrophysics · Physics 2014-10-13 David R. Alves , Cailin A. Nelson

We assemble a catalogue of candidate Sagittarius stream members with 5d and 6d phase-space information, using astrometric data from Gaia DR2, distances estimated from RR Lyrae stars, and line-of-sight velocities from various spectroscopic…

Astrophysics of Galaxies · Physics 2021-02-22 Eugene Vasiliev , Vasily Belokurov , Denis Erkal

The hierarchical nature of LCDM suggests that the Magellanic Clouds must have been surrounded by a number of satellites before their infall into the Milky Way. Many of those satellites should still be in close proximity to the Clouds, but…

Astrophysics of Galaxies · Physics 2016-12-21 Laura V. Sales , Julio F. Navarro , Nitya Kallivayalil , Carlos S. Frenk

Recent theoretical and observational analysis of the interaction between the Milky Way (MW) and LMC suggest that it has a significant dynamical impact on the MW's stellar halo. We investigate this effect using simulations from the Latte…

Astrophysics of Galaxies · Physics 2026-02-04 Mia Mansfield , Robyn Sanderson , Daniel Hey , Daniel Huber , Arpit Arora , Emily Cunningham , Nondh Panithanpaisal

The history of the Magellanic Clouds is investigated using N-body hydrodynamic simulations where the initial conditions are set by a genetic algorithm. This technique allows us to identify possible orbits for the Magellanic Clouds around…

Astrophysics of Galaxies · Physics 2015-06-22 Magda Guglielmo , Geraint F. Lewis , Joss Bland-Hawthorn

The 3D observed velocities of the Large and Small Magellanic Clouds(LMC and SMC) provide an opportunity to probe the Galactic potential in the outskirt of the Galactic halo. Based on a canonical NFW model of the Galactic potential, Besla et…

Astrophysics of Galaxies · Physics 2015-06-11 Xiaojia Zhang , Douglas N. C. Lin , Andreas Burkert , Ludwig Oser

The distribution of dark matter in the Milky Way (MW) is expected to exhibit a large-scale dynamical response to the recent infall of the LMC. This event produces a dynamical friction wake and shifts the MW's halo density center. The…

The Large and Small Magellanic Clouds (LMC and SMC) are the Milky Way's nearest interacting galaxy pair, offering a unique laboratory for studying tidal effects on galactic disks. Despite extensive survey efforts, the three-dimensional…

Observational work have shown that the two brightest satellite galaxies of the Milky Way (MW), the Large Magellanic Cloud (LMC) and the Small Magellanic Cloud (SMC), are rare amongst MW analogues. It is then interesting to know whether the…

Astrophysics of Galaxies · Physics 2019-05-21 Dali Zhang , Yu Luo , Xi Kang

We review our understanding of the kinematics of the LMC and the SMC, and their orbit around the Milky Way. The line-of-sight velocity fields of both the LMC and SMC have been mapped with high accuracy using thousands of discrete traces, as…

Astrophysics · Physics 2009-11-13 Roeland P. van der Marel , Nitya Kallivayalil , Gurtina Besla