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Because cosmic rays are charged particles scrambled by magnetic fields, combining direct measurements with other observations is crucial to understanding their origin and propagation. As energetic particles traverse matter and…

高能天体物理现象 · 物理学 2019-08-13 L. Tibaldo

We have modelled the high-energy astrophysics of the inner 200 pc of the Galaxy with a view to explaining the diffuse, broad-band (radio continuum to TeV gamma-ray), non-thermal signal detected from this region. Our modelling pins down the…

高能天体物理现象 · 物理学 2011-03-29 Roland M. Crocker

We derive structural parameters and evidence for extended tidal debris from star count and preliminary standard candle analyses of the Large Magellanic Cloud based on Two Micron All Sky Survey (2MASS) data. The full-sky coverage and low…

天体物理学 · 物理学 2010-01-07 Martin D. Weinberg , Sergei Nikolaev

The Large Magellanic Cloud (LMC) is home to many HII regions, which may lead to significant outflows. We examine the LMC's multiphase gas ($T\sim10^{4-5}$ K) in HI, SII, SiIV, and CIV using 110 stellar sight lines from the HST's Ultraviolet…

In this paper we report the Fermi Large Area Telescope (LAT) detection of the gamma-ray emission toward the young star forming region W43. Using the latest source catalog and diffuse background models, the extended gamma-ray excess is…

高能天体物理现象 · 物理学 2020-08-19 Rui-zhi Yang , Yuan Wang

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…

天体物理学 · 物理学 2009-01-01 L. Staveley-Smith , S. Kim , M. R. Calabretta , R. F. Haynes , M. J. Kesteven

We report the detection of high-energy gamma-ray emission from two starburst galaxies using data obtained with the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. Steady point-like emission above 200 MeV has been detected…

高能天体物理现象 · 物理学 2014-11-20 Fermi LAT Collaboration , A. A. Abdo

Galaxy clusters are the most massive gravitationally bound structures in the Universe. Even if clusters are nearly virialized structures, they undergo merging processes, creating merging shocks, and suffer from feedback from galaxies and…

高能天体物理现象 · 物理学 2025-09-22 Judit Pérez-Romero , Mattia di Mauro , Rémi Adam , Miguel Á. Sánchez-Conde , Gabrijela Zaharijas

Star-forming and starburst galaxies, which are well-known cosmic-rays reservoirs, are expected to emit gamma-rays and neutrinos predominantly via hadronic collisions. In this Letter, we analyze the 10-year Fermi-LAT spectral energy…

高能天体物理现象 · 物理学 2021-10-07 Antonio Ambrosone , Marco Chianese , Damiano F. G. Fiorillo , Antonio Marinelli , Gennaro Miele

We present an overview of, and first science results from, the Magellanic Edges Survey (MagES), an ongoing spectroscopic survey mapping the kinematics of red clump and red giant branch stars in the highly substructured periphery of the…

星系天体物理 · 物理学 2020-07-22 L. R. Cullinane , A. D. Mackey , G. S. Da Costa , S. E. Koposov , V. Belokurov , D. Erkal , A. Koch , A. Kunder , D. M. Nataf

We report the results of our study of the energy spectra and absolute fluxes of cosmic rays (CRs) in the Local Galaxy based on a five-year $\gamma$-ray observation with the Fermi Large Area Telescope (LAT) of eight nearby giant molecular…

高能天体物理现象 · 物理学 2014-07-03 Rui-zhi Yang , Emma de Oña Wilhelmi , Felix Aharonian

The Large Magellanic Cloud (LMC) experiences disruption from tidal and ram-pressure forces as it travels through the halo of the Milky Way. In this project, we combine radio emission-line observations from the GASS and GASKAP surveys with…

We present V- and I-equivalent HST/WFPC2 stellar photometry of an area in the Large Magellanic Cloud (LMC), located on the western edge of the bar of the galaxy, which accounts for the general background field of its inner disk. The WFPC2…

天体物理学 · 物理学 2009-11-13 D. Gouliermis , W. Brandner , Th. Henning

Despite their close proximity, the complex interplay between the two Magellanic Clouds, the Milky Way, and the resulting tidal features, is still poorly understood. Recent studies have shown that the Large Magellanic Cloud (LMC) has a very…

The Large and Small Magellanic Clouds (LMC/SMC) are the closest major satellite galaxies of the Milky Way. They are likely on their first passage on an infalling orbit towards our Galaxy (Besla et al. 2007) and trace the ongoing dynamics of…

A 20 arcmin \times 20 arcmin region around 30 Doradus in the Large Magellanic Cloud (LMC) is observed and analyzed in the near-infrared. We obtain polarimetry data in the J, H, and K_s bands using the SIRIUS polarimeter SIRPOL at the…

宇宙学与河外天体物理 · 物理学 2011-10-21 Kim Jaeyeong , Pak Soojong , Choi Minho , Kang Wonseok , Kandori Ryo , Tamura Motohide , Nagata Tetsuya , Kwon Jungmi , Kato Daisuke , Daniel T Jaffe

We present a multi-wavelength study of three star forming regions, spanning the age range 1-14 Myr, located between the 30 Doradus complex and supernova SN1987A in the Large Magellanic Cloud (LMC). We reliably identify about 1000 pre-main…

太阳与恒星天体物理 · 物理学 2015-06-03 L. Spezzi , G. De Marchi , N. Panagia , A. Sicilia-Aguilar , B. Ercolano

We have used high-resolution spectra obtained with the multifiber facility FLAMES at the Very Large Telescope of the European Southern Observatory to derive kinematic properties and chemical abundances of Fe, O, Mg and Si for 89 stars in…

星系天体物理 · 物理学 2012-11-26 Emilio Lapenna , Alessio Mucciarelli , Livia Origlia , Francesco R. Ferraro

We study the high latitude (|b|>10) diffuse gamma-ray emission in the Galaxy in light of the recently published data from the Fermi collaboration at energies between 100 MeV and 100 GeV. The unprecedented accuracy in these measurements…

高能天体物理现象 · 物理学 2013-04-16 I. Cholis , M. Tavakoli , C. Evoli , L. Maccione , P. Ullio

High-energy gamma-ray emission from the Galactic plane above ~100 MeV is composed of three main contributions: diffuse emission from cosmic ray interactions in the interstellar medium, emission from extended sources, such as supernova…

高能天体物理现象 · 物理学 2015-06-05 A. Neronov , D. Malyshev , M. Chernyakova , A. Lutovinov