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We introduce a novel theoretical model to explain the long-standing puzzle of the nature of the microlensing events reported towards the Large Magellanic Cloud (LMC) by the MACHO and OGLE collaborations. We propose that a population of…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-05 Gurtina Besla , Lars Hernquist , Abraham Loeb

The ongoing interaction between the Milky Way (MW) and its largest satellite - the Large Magellanic Cloud (LMC) - creates a significant perturbation in the distribution and kinematics of distant halo stars, globular clusters and satellite…

Astrophysics of Galaxies · Physics 2022-02-25 Lilia Correa Magnus , Eugene Vasiliev

When a subhalo interacts with a cold stellar stream it perturbs its otherwise nearly smooth distribution of stars, and this leads to the creation of a gap. The properties of such gaps depend on the parameters of the interaction. Their…

Astrophysics of Galaxies · Physics 2021-05-19 Helmer H. Koppelman , Amina Helmi

The Magellanic Stream is sculpted by its infall through the Milky Way's circumgalactic medium, but the rates and directions of mass, momentum, and energy exchange through the Stream-halo interface are relative unknowns critical for…

Astrophysics of Galaxies · Physics 2022-07-20 Chad Bustard , Max Gronke

Perturbations from the Large Magellanic Cloud (LMC) of the Milky Way's stellar and dark matter haloes are well-established. However, studies have generally not considered haloes with high radial anisotropy, like debris from the Gaia…

Astrophysics of Galaxies · Physics 2026-03-13 Adam M. Dillamore , Jason L. Sanders , Richard A. N. Brooks

We develop a framework for modelling the Milky Way using stellar streams and a wide range of photometric and kinematic observations. Through the use of mock data we demonstrate that a standard suite of Galactic observations leads to…

Astrophysics of Galaxies · Physics 2014-03-05 Nathan Deg , Lawrence Widrow

The interaction between the supersonic motion of the Large Magellanic Cloud (LMC) and the Circumgalactic Medium (CGM) is expected to result in a bow shock that leads the LMC's gaseous disk. In this letter, we use hydrodynamic simulations of…

Astrophysics of Galaxies · Physics 2023-11-20 David J. Setton , Gurtina Besla , Ekta Patel , Cameron Hummels , Yong Zheng , Evan Schneider

The formation of the Magellanic Stream has puzzled astronomers for decades. In this review, we outline the history of our understanding of the Magellanic System highlighting key observations that have revolutionized thinking of its…

Astrophysics of Galaxies · Physics 2024-11-19 Scott Lucchini

Mergers and tidal interactions between massive galaxies and their dwarf satellites are a fundamental prediction of the Lambda-Cold Dark Matter cosmology. These events are thought to influence galaxy evolution throughout cosmic history and…

Astrophysics of Galaxies · Physics 2018-12-03 David Martinez-Delgado

The infall of the Large Magellanic Cloud (LMC) into the Milky Way (MW) has displaced the MW's centre of mass, manifesting as an observed reflex motion in the velocities of outer halo stars. We use a Simulation Based Inference framework to…

The dynamics of the Magellanic Stream (MS) as a series of clouds extending from the Magellanic Clouds (MCs) to the south Galactic pole is affected by the distribution and the amount of matter in the Milky Way. We calculate the gravitational…

Astrophysics · Physics 2011-02-11 Hossein Haghi , Sohrab Rahvar , Akram Hasani-Zonooz

Narrow stellar streams in the Milky Way halo are uniquely sensitive to dark-matter subhalos, but many of these subhalos may be tidally disrupted. I calculate the interaction between stellar and dark-matter streams using analytical and…

Astrophysics of Galaxies · Physics 2016-03-30 Jo Bovy

Stellar streams, long, thin streams of stars, have been used as sensitive probes of dark matter substructure for over two decades. Gravitational interactions between dark matter substructures and streams lead to the formation of low-density…

Astrophysics of Galaxies · Physics 2026-03-26 Paul Menker , Andrew Benson

We present new simulations of the formation of the Magellanic Stream based on an updated first-passage interaction history for the Magellanic Clouds, including both the Galactic and Magellanic Coronae and a live dark matter halo for the…

Astrophysics of Galaxies · Physics 2021-11-24 Scott Lucchini , Elena D'Onghia , Andrew J. Fox

The unique dynamics of the tidal disruption of satellite galaxies is an extremely sensitive probe of long-range interactions between dark-matter particles. Dark-matter forces that are several percent the strength of gravity will lead to…

Cosmology and Nongalactic Astrophysics · Physics 2009-11-17 Michael Kesden

We present a novel pair of numerical models of the interaction history between the Large and Small Magellanic Clouds (LMC and SMC, respectively) and our Milky Way (MW) in light of recent high precision proper motions (Kallivayalil et al.…

Astrophysics of Galaxies · Physics 2015-06-03 Gurtina Besla , Nitya Kallivayalil , Lars Hernquist , Roeland P. van der Marel , T. J. Cox , Dusan Keres

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

Characterizing the predicted environments of dwarf galaxies like the Large Magellanic Cloud (LMC) is becoming increasingly important as next generation surveys push sensitivity limits into this low-mass regime at cosmological distances. We…

Modelling perturbations of the Milky Way (MW) halo induced by the infall of the Large Magellanic Cloud (LMC) offers new avenues to constrain the dark matter (DM) distribution in our Galaxy. A key observable is the reflex motion of the MW…

Astrophysics of Galaxies · Physics 2025-08-08 Rashid Yaaqib , Michael Petersen , Jorge Peñarrubia

The Milky Way (MW) and M31 both harbor massive satellite galaxies, the Large Magellanic Cloud (LMC) and M33, which may comprise up to 10 per cent of their host's total mass. Massive satellites can change the orbital barycentre of the…

Astrophysics of Galaxies · Physics 2016-12-07 Ekta Patel , Gurtina Besla , Tony Sohn