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A combination of analytic models and n-body simulations implies that the structural evolution of the Large Magellanic Cloud (LMC) is dominated by its dynamical interaction with the Milky Way. Although expected at some level, the scope of…

天体物理学 · 物理学 2009-10-31 Martin D. Weinberg

We use FIRE-2 zoom simulations of Milky Way size disk galaxies to derive easy-to-use relationships between the observed circular speed of the Galaxy at the Solar location, $v_\mathrm{c}$, and dark matter properties of relevance for direct…

星系天体物理 · 物理学 2024-08-15 Patrick G. Staudt , James S. Bullock , Michael Boylan-Kolchin , David Kirkby , Andrew Wetzel , Xiaowei Ou

The Large Magellanic Cloud is the most massive satellite galaxy of the Milky Way, with an estimated mass exceeding a tenth of the mass of the Milky Way. Just past its closest approach of about 50 kpc, and flying by the Milky Way at an…

星系天体物理 · 物理学 2020-11-24 Michael S. Petersen , Jorge Peñarrubia

High-velocity particles ( $v>v_\mathrm{esc}$) in the Milky Way are rare but nonetheless important to characterize due to their impact on dark matter (DM) direct detection experiments. We select halos similar in mass to the Milky Way in a…

星系天体物理 · 物理学 2025-02-26 Aidan DeBrae , Peter Behroozi , Nicolas Garavito-Camargo

The Large and Small Magellanic Clouds (LMC and SMC, respectively) are the largest satellite galaxies of the Milky Way (MW) and their interactions with each other have given rise to multiple stellar substructures in their periphery as well…

星系天体物理 · 物理学 2026-02-06 Bethany Garver , David Nidever , Victor Debattista , Nathan Deg

We studied the spatial distribution of young and old stellar populations along the western half part of the minor axis of the Large Magellanic Cloud (LMC) using Washington MT1 photometry of selected fields, which span a deprojected distance…

星系天体物理 · 物理学 2017-12-06 Andrés E. Piatti

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…

星系天体物理 · 物理学 2015-06-11 Xiaojia Zhang , Douglas N. C. Lin , Andreas Burkert , Ludwig Oser

We estimate the mass of the Large Magellanic Cloud (LMC) using the kinematics of 30 LMC globular clusters (GCs). We combine proper motions (PMs) measured with HST, Gaia, or a combination of the two, from a recent study by Bennet et al.…

星系天体物理 · 物理学 2024-01-29 Laura L. Watkins , Roeland P. van der Marel , Paul Bennet

The infall of the Large Magellanic Cloud (LMC) is predicted to displace the inner Milky Way (MW), imprinting an apparent 'reflex motion' on the observed velocities of distant halo stars. We construct the largest all-sky spectroscopic…

Given recent developments in our understanding of the Large Magellanic Cloud's (LMC) impact on the Milky Way's (MW) dark matter subhalo population, we compare the signatures of dark matter and baryonic physics on subhalos in MW systems with…

宇宙学与河外天体物理 · 物理学 2021-10-13 Ethan O. Nadler , Arka Banerjee , Susmita Adhikari , Yao-Yuan Mao , Risa H. Wechsler

At a distance of 50 kpc and with a dark matter mass of $\sim10^{10}$ M$_{\odot}$, the Large Magellanic Cloud (LMC) is a natural target for indirect dark matter searches. We use five years of data from the Fermi Large Area Telescope (LAT)…

We model the response of spherical, non-rotating Milky Way (MW) dark matter and stellar halos to the Large Magellanic Cloud (LMC) using the matrix method of linear response theory. Our computations reproduce the main features of the dark…

星系天体物理 · 物理学 2022-07-20 Simon Rozier , Benoit Famaey , Arnaud Siebert , Giacomo Monari , Christophe Pichon , Rodrigo Ibata

The differential event rate in Weakly Interacting Massive Particle (WIMP) direct detection experiments depends on the local dark matter density and velocity distribution. Accurate modelling of the local dark matter distribution is therefore…

宇宙学与河外天体物理 · 物理学 2017-08-02 Anne M Green

We study the local dark matter velocity distribution in simulated Milky Way-mass galaxies, generated at high resolution with both dark matter and baryons. We find that the dark matter in the Solar neighborhood is influenced appreciably by…

星系天体物理 · 物理学 2016-11-09 Jonathan D. Sloane , Matthew R. Buckley , Alyson M. Brooks , Fabio Governato

We have determined the proper motion (PM) of the Large Magellanic Cloud (LMC) relative to four background quasi-stellar objects, combining data from two previous studies made by our group, and new observations carried out in four epochs not…

天体物理学 · 物理学 2008-11-26 Mario H. Pedreros , Edgardo Costa , Rene A. Mendez

Our goal is to study the gravitational effects caused by the passage of the Large Magellanic Cloud (LMC) in its orbit on the stellar halo of the Milky Way (MW). We employed the Gaia Data Release 3 to construct a halo tracers data set…

星系天体物理 · 物理学 2024-08-21 K. J. Fushimi , M. E. Mosquera , M. Dominguez

Simulations of structure formation in the standard cold dark matter cosmological model quantify the dark matter halos of galaxies. Taking into account dynamical friction between the dark matter halos, we investigate the past orbital…

星系天体物理 · 物理学 2024-03-28 Wolfgang Oehm , Pavel Kroupa

We investigate how the Large Magellanic Cloud (LMC) influences the evolution of the Galaxy after the LMC enters into the virial radius of the dark matter halo of the Galaxy for the first time. Both the Galaxy and the LMC are modeled as…

星系天体物理 · 物理学 2015-06-04 Kenji Bekki

We present a study illustrating the effects of the passage of a Large Magellanic Cloud (LMC) mass satellite on the distance and velocity distributions of satellites in $\Lambda+$Cold Dark Matter simulations of Milky Way (MW) sized halos. In…

星系天体物理 · 物理学 2024-06-24 Andrey Kravtsov , Sophia Winney

This paper explores the effect of the LMC on the mass estimates obtained from the timing argument. We show that accounting for the presence of the LMC systematically lowers the Local Group mass ($M_{\rm LG}$) derived from the relative…

星系天体物理 · 物理学 2015-12-02 Jorge Peñarrubia , Facundo A. Gómez , Gurtina Besla , Denis Erkal , Yin-Zhe Ma