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Context: The Large Magellanic Cloud (LMC) is to date the only normal external galaxy that has been detected in high-energy gamma rays. High-energy gamma rays trace particle acceleration processes and gamma-ray observations allow the nature…

High Energy Astrophysical Phenomena · Physics 2016-04-13 LAT collaboration , A. A. Abdo

Context: The high quality of the Gaia mission data is allowing to study the internal kinematics of the Large Magellanic Cloud (LMC) in unprecedented detail, providing insights on the non-axisymmetric structure of its disc. Aims: To define…

Astrophysics of Galaxies · Physics 2023-01-18 Ó. Jiménez-Arranz , M. Romero-Gómez , X. Luri , P. J. McMillan , T. Antoja , L. Chemin , S. Roca-Fàbrega , E. Masana , A. Muros

We present a new measurement of the systemic proper motion of the Small Magellanic Cloud (SMC), based on an expanded set of 30 fields containing background quasars and spanning a $\sim$3 year baseline, using the \textit{Hubble Space…

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…

Astrophysics of Galaxies · Physics 2024-03-28 Wolfgang Oehm , Pavel Kroupa

Bound orbits have traditionally been assigned to the Large and Small Magellanic Clouds (LMC and SMC, respectively) in order to provide a formation scenario for the Magellanic Stream (MS) and its Leading Arm (LA), two prominent neutral…

Astrophysics of Galaxies · Physics 2015-05-27 Jonathan Diaz , Kenji Bekki

Dwarf galaxies enable us to study the early phases of galaxy evolution and are key to many open questions about the hierarchical structure of the Universe. The Large and Small Magellanic Cloud (LMC and SMC) are the most luminous dwarf…

Astrophysics of Galaxies · Physics 2019-11-06 Thomas Schmidt , Maria-Rosa Cioni , Florian Niederhofer , Jonathan Diaz , Gal Matijevic

Due to their close proximity, the Large and Small Magellanic Clouds (SMC/LMC) provide natural laboratories for understanding how galaxies form and evolve. With the goal of determining the structure and dynamical state of the SMC, we present…

Astrophysics of Galaxies · Physics 2020-05-06 Michele De Leo , Ricardo Carrera , Noelia E. D. Noel , Justin I. Read , Denis Erkal , Carme Gallart

Using proper motion measurements from Gaia DR2, we probe the origin of 26 previously known hypervelocity stars (HVSs) around the Milky Way. We find that a significant fraction of these stars have a high probability of originating close to…

Astrophysics of Galaxies · Physics 2018-10-17 Denis Erkal , Douglas Boubert , Alessia Gualandris , N. Wyn Evans , Fabio Antonini

The structural parameters of the disk of the Large Magellanic Cloud (LMC) are estimated.We used the red clump stars from the VI photometric data of the Optical Gravitational Lensing Experiment survey and from the Magellanic Cloud…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 Smitha Subramanian , Annapurni Subramaniam

We present a Parkes multibeam \HI survey of the Large Magellanic Cloud (LMC). This survey, which is sensitive to spatial structure in the range 200 pc to 10 kpc, complements the Australia Telescope Compact survey, which is sensitive to…

Astrophysics · Physics 2009-01-01 L. Staveley-Smith , S. Kim , M. R. Calabretta , R. F. Haynes , M. J. Kesteven

We present the first results from a high resolution simulation with a focus on galactic wind driving for an isolated galaxy with a halo mass of $\sim 10^{11}$ M$_{\odot}$ (similar to the Large Magellanic Cloud) and a total gas mass of $\sim…

We report the discovery of 15 stars in the H3 survey that lie, in projection, near the tip of the trailing gaseous Magellanic Stream (MS). The stars have Galactocentric velocities $< -155$ km s$^{-1}$, Galactocentric distances of $\approx…

We combine our Hubble Space Telescope measurement of the proper motion of the Leo I dwarf spheroidal galaxy (presented in a companion paper) with the highest resolution numerical simulations of Galaxy-size dark matter halos in existence to…

Cosmology and Nongalactic Astrophysics · Physics 2014-02-17 Michael Boylan-Kolchin , James S. Bullock , Sangmo Tony Sohn , Gurtina Besla , Roeland P. van der Marel

The simplest interpretation of the microlensing events towards the Large Magellanic Cloud detected by the MACHO and EROS collaborations is that about one third of the halo of our own Milky Way galaxy exists in the form of objects of around…

Astrophysics · Physics 2009-10-30 N. W. Evans , G. Gyuk , M. S. Turner , J. J. Binney

Increasing evidences suggest that the Galactic halo is lumpy on kpc scales due to the accretion of at least a dozen small galaxies (LMC/SMC, Sgr, Fornax etc.). Faint stars in such lumpy structures can significant microlense a background…

Astrophysics · Physics 2009-10-30 HongSheng Zhao

We set new limits on the mass of the Milky Way, making use of the latest kinematic information for Galactic satellites and halo objects. In order to bind these sample objects to the Galaxy, their rest-frame velocities must be lower than…

Astrophysics · Physics 2009-11-07 Tsuyoshi Sakamoto , Masashi Chiba , Timothy C. Beers

We assess the fraction of the Milky Way's circumgalactic medium (CGM) eluding detection due to its velocity being similar to gas in the disk. This is achieved using synthetic observations of the CGM in a simulated MW-mass galaxy that shows…

Astrophysics of Galaxies · Physics 2017-11-02 Y. Zheng , M. E. Putman , J. E. G. Peek , M. R. Joung

We present Milky Way-est, a suite of 20 cosmological cold-dark-matter-only zoom-in simulations of Milky Way (MW)-like host halos. Milky Way-est hosts are selected such that they (i) are consistent with the MW's measured halo mass and…

Astrophysics of Galaxies · Physics 2024-08-09 Deveshi Buch , Ethan O. Nadler , Risa H. Wechsler , Yao-Yuan Mao

The kinematics of 150 carbon stars observed at moderate dispersion on the periphery of the Small Magellanic Cloud are compared with the motions of neutral hydrogen and early type stars in the Inter-Cloud region. The distribution of radial…

Astrophysics · Physics 2009-10-31 William Kunkel , Serge Demers , M. J. Irwin

We present an analysis of the stellar kinematics of the Large Magellanic Cloud based on ~5900 new and existing velocities of massive red supergiants, oxygen-rich and carbon-rich AGB stars, and other giants. After correcting the…

Astrophysics of Galaxies · Physics 2017-01-04 Knut A. G. Olsen , Dennis Zaritsky , Robert D. Blum , Martha L. Boyer , Karl D. Gordon
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