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The recent analyses of the Fermi Large Area Telescope data show an extended GeV $\gamma$-ray excess on top of the expected diffuse background in the Galactic center region, which can be explained with annihilating dark matter or a…

高能天体物理现象 · 物理学 2015-04-23 Qiang Yuan , Kunihito Ioka

Gamma rays from young pulsars and milli-second pulsars are expected to contribute to the diffuse gamma-ray emission measured by the {\it Fermi} Large Area Telescope (LAT) at high latitudes. We derive the contribution of the pulsars…

高能天体物理现象 · 物理学 2014-12-17 Francesca Calore , Mattia Di Mauro , Fiorenza Donato

The diffuse gamma-ray emission from the Milky Way serves as a crucial probe for understanding the propagation and interactions of cosmic rays within our galaxy. The Galactic diffuse gamma-ray emission between 10 TeV and 1 PeV has been…

高能天体物理现象 · 物理学 2025-01-07 Jiayin He , Houdun Zeng , Yi Zhang , Qiang Yuan , Rui Zhang , Jun Li

We revisit the association of unidentified Galactic plane EGRET sources with tracers of recent massive star formation and death. Up-to-date catalogs of OB associations, SNRs, young pulsars, HII regions and young open clusters were used in…

天体物理学 · 物理学 2009-10-28 I. -A. Yadigaroglu , Roger W. Romani

The survey of the inner Galaxy with H.E.S.S. was remarkably successful in detecting a wide range of new very-high-energy gamma-ray sources. New TeV gamma-ray emitting source classes were established, although several of the sources remain…

星系天体物理 · 物理学 2015-05-13 S. Funk , J. A. Hinton , G. Hermann , S. Digel

Many star-forming galaxies and those hosting active galactic nuclei (AGN) show evidence of massive outflows of material in a variety of phases including ionized, neutral atomic, and molecular. Molecular outflows in particular have been the…

高能天体物理现象 · 物理学 2023-02-15 Alex McDaniel , Marco Ajello , Chris Karwin

Globular clusters (GCs) are evolved stellar systems containing entire populations of millisecond pulsars (MSPs), which are efficient gamma-ray emitters. Observations of this emission can be used as a powerful tool to explore the dynamical…

高能天体物理现象 · 物理学 2019-04-10 Raniere de Menezes , Fabio Cafardo , Rodrigo Nemmen

Feedback from Young Massive Clusters (YMCs) is an important driver of galaxy evolution. In the first few Myr, mechanical feedback is dominated by collective effects of the massive stellar winds in the YMC. The mass-loss rates and terminal…

星系天体物理 · 物理学 2025-11-19 C. J. K. Larkin , C. Hawcroft , J. Mackey , R. R. Lefever , L. Härer , A. A. C. Sander

If the mysterious Fermi-LAT GeV gamma-ray excess is due to an unresolved population of millisecond pulsars (MSP) in the Galactic bulge, one expects this very same population to shine in X rays. For the first time, we address the question of…

We analyse the population of bright star clusters in the interacting galaxy pair NGC 4038/39 detected with HST WFPC1 by Whitmore & Schweizer (1995) using our spectrophotometric evolutionary synthesis models for various initial…

天体物理学 · 物理学 2007-05-23 Uta Fritze-v. Alvensleben

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

We examine the spatial distribution of star clusters in NGC 628 using the statistical tool INDICATE to quantify clustering tendencies. Our sample, based on HST and JWST observations, is the most complete to date, spanning ages from 1 Myr to…

Measurements of the nearby pulsars Geminga and B0656+14 by the HAWC and Milagro telescopes have revealed the presence of bright TeV-emitting halos surrounding these objects. If young and middle-aged pulsars near the Galactic Center transfer…

高能天体物理现象 · 物理学 2017-12-12 Dan Hooper , Ilias Cholis , Tim Linden

We estimate the contribution of Galactic pulsars, both ordinary and millisecond pulsars (MSPs), to the high-energy (>100 MeV) gamma-ray background. We pay particular attention to the high-latitude part of the background that could be…

高能天体物理现象 · 物理学 2010-01-15 C. -A. Faucher-Giguere , Abraham Loeb

It has been shown that supernova blast waves interacting with winds from massive stars in compact star clusters may be capable of producing cosmic-ray (CR) protons to above $10^{17}$ eV. We give a brief description of the…

高能天体物理现象 · 物理学 2019-12-13 A. M. Bykov , M. E. Kalyashova , D. C. Ellison , S. M. Osipov

Galactic diffuse gamma-ray emission is produced by the interaction of high-energy cosmic rays propagating through the Milky Way with interstellar gas and radiation fields. Its measurement can provide crucial insights into the acceleration…

高能天体物理现象 · 物理学 2025-09-04 Georg Schwefer

This review summarises the main properties of Young Massive Clusters (YMCs), including their population properties, particularly focusing on extragalactic cluster samples. We discuss potential biases and caveats that can affect the…

星系天体物理 · 物理学 2016-11-23 Nate Bastian

We have investigated the properties of a group of $\gamma$-ray emitting globular clusters (GCs) which have recently been uncovered in our Galaxy. By correlating the observed $\gamma$-ray luminosities $L_{\gamma}$ with various cluster…

高能天体物理现象 · 物理学 2015-05-27 C. Y. Hui , K. S. Cheng , Y. Wang , P. H. T. Tam , A. K. H. Kong , D. O. Chernyshov , V. A. Dogiel

Cosmic rays (CRs) generate diffuse emission while interacting with the Galactic magnetic field (B-field), the interstellar gas and the radiation field. This diffuse emission extends from radio, microwaves, through X-rays, to high-energy…

高能天体物理现象 · 物理学 2016-06-22 Elena Orlando

The Galactic gamma-ray flux can be described as the sum of two components: the first is due to the emission from an ensemble of discrete sources, and the second is formed by the photons produced by cosmic rays propagating in interstellar…

高能天体物理现象 · 物理学 2024-12-13 Paolo Lipari , Silvia Vernetto