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Related papers: The Pionic Contribution to Diffuse Gamma Rays: Upp…

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We perform a composite likelihood analysis of subdivided regions within the central $26^\circ\times20^\circ$ of the Milky Way, with the aim of characterizing the spectrum of the gamma-ray galactic center excess in regions of varying…

High Energy Astrophysical Phenomena · Physics 2018-01-30 Shunsaku Horiuchi , Manoj Kaplinghat , Anna Kwa

Recent Fermi and VERITAS observations of the prototypical Type Ia supernova remnant (SNR) Tycho have discovered gamma-rays with energies E in the range from ~0.4 GeV to 10 TeV. Crucial for the theory of Galactic cosmic-ray origin is whether…

High Energy Astrophysical Phenomena · Physics 2016-08-17 Armen Atoyan , Charles Dermer

The propagation of particles accelerated at supernova remnant shocks and escaping the parent remnants is likely to proceed in a strongly non-linear regime, due to the efficient self-generation of Alfv\'en waves excited through streaming…

High Energy Astrophysical Phenomena · Physics 2017-12-27 M. D'Angelo , G. Morlino , E. Amato , P. Blasi

Gamma rays from TeV blazars have been detected by ground-based experiments for more than two decades. We have collected the most extensive set of archival spectra from these sources in order to constrain the processes affecting gamma-ray…

Cosmology and Nongalactic Astrophysics · Physics 2015-08-26 Jonathan Biteau , David A. Williams

Starburst galaxies are $\gamma$-ray sources. Canonically, their emission is driven by hadronic cosmic rays (CRs) interacting with interstellar gas, forming $\gamma$-rays via the decay of neutral pions. Charged pions are also formed in this…

High Energy Astrophysical Phenomena · Physics 2025-05-06 Ellis R. Owen , Yoshiyuki Inoue , Tatsuki Fujiwara , Albert K. H. Kong

The MAGIC Collaboration has provided new observational data pertaining to the TeV J2032+4130 gamma-ray source (within the Cygnus OB2 region), for energies E_gamma >400 GeV. It is then appropriate to update the impact of these data on…

High Energy Astrophysical Phenomena · Physics 2009-11-27 Luis A. Anchordoqui , Haim Goldberg , Russell D. Moore , Sergio Palomares-Ruiz , Diego F. Torres , Thomas J. Weiler

The flux upper limits of the diffuse gamma rays, from the inner and outer Galactic planes, are revised by factors of 4.0$\sim$3.7 for mode energies 3$\sim$10 TeV, respectively, by using the simulation results of the effective area ratios…

Astrophysics · Physics 2007-05-23 The Tibet AS Gamma Collaboration , M. Amenomori

The intense 0.511 MeV gamma-ray line emission from the Galactic Center observed by INTEGRAL requires a large annihilation rate of nonrelativistic positrons. If these positrons are injected at even mildly relativistic energies, higher-energy…

Astrophysics · Physics 2008-11-26 John F. Beacom , Hasan Yuksel

We introduce a new time-dependent lepto-hadronic model for blazar emission that takes into account the radiation emitted by secondary particles, such as pions and muons, from photo hadronic interactions. Starting from a baseline parameter…

High Energy Astrophysical Phenomena · Physics 2015-06-23 Christopher Diltz , Markus Boettcher , Giovanni Fossati

While star-forming galaxies could be major contributors to the cosmic GeV $\gamma$-ray background, they are expected to be MeV-dim because of the "pion bump" falling off below ~100 MeV. However, there are very few observations of galaxies…

High Energy Astrophysical Phenomena · Physics 2015-06-05 Brian C. Lacki , Shunsaku Horiuchi , John F. Beacom

We study the effects that the diffusion of the cosmic rays in the magnetic field of the Local Supercluster can have on the spectrum of a nearby extragalactic source at ultrahigh energies. We find that the strong enhancement of the flux…

High Energy Astrophysical Phenomena · Physics 2019-05-22 Silvia Mollerach , Esteban Roulet

The ultra high-energy (UHE) Galactic diffuse gamma-ray emission holds important information on the propagation of cosmic rays in the Galaxy. However, its measurements suffer from a contamination from unresolved sources whose contribution…

High Energy Astrophysical Phenomena · Physics 2024-11-04 Samy Kaci , Gwenael Giacinti , Dmitri Semikoz

Applying our recently developed propagation code we review extragalactic neutrino fluxes above 10^{14} eV in various scenarios and how they are constrained by current data. We specifically identify scenarios in which the cosmogenic neutrino…

High Energy Physics - Phenomenology · Physics 2009-11-07 Oleg E. Kalashev , Vadim A. Kuzmin , Dmitry V. Semikoz , Guenter Sigl

We investigate the interactions of energetic hadronic particles with the media in outflows from star-forming protogalaxies. These particles undergo pion-producing interactions which can drive a heating effect in the outflow, while those…

Astrophysics of Galaxies · Physics 2019-02-06 Ellis R. Owen , Xiangyu Jin , Kinwah Wu , Suetyi Chan

Using the fact that the contribution of the states with isospin I=0 in the difference of the amplitudes of the processes \gamma \gamma->\pi^+\pi^- and \gamma\gamma->\pi^0\pi^0 is very small, we have analyzed the dispersion sum rules for the…

Nuclear Theory · Physics 2014-02-11 L. V. Fil'kov

LS I+61 303 has been detected by the Cherenkov telescope MAGIC at very high energies, presenting a variable flux along the orbital motion with a maximum clearly separated from the periastron passage. In the light of the new observational…

Astrophysics · Physics 2008-11-26 M. Orellana , G. E. Romero

The last measurement of the diffuse emission spectrum of the Milky Way in the megaelectronvolt (MeV) photon energy range was performed by CGRO/COMPTEL more than 20 years ago. We report a new analysis with the spectrometer SPI aboard…

High Energy Astrophysical Phenomena · Physics 2022-02-10 Thomas Siegert , Joanna Berteaud , Francesca Calore , Pasquale D. Serpico , Christoph Weinberger

The new Voyager measurements of cosmic ray electrons between 6-60 MeV beyond 122 AU are very sensitive indicators of cosmic ray propagation and acceleration in the galaxy at a very low modulation level. Using a Monte Carlo diffusion model…

Space Physics · Physics 2013-09-02 W. R. Webber , P. R. Higbie

We present a systematic study of the non-thermal electron-proton plasma and its emission processes in starburst galaxies in order to explain the correlation between the luminosity in the radio band and the recently observed gamma…

High Energy Astrophysical Phenomena · Physics 2016-05-04 Björn Eichmann , Julia Becker Tjus

The differential cross section for gamma-deuteron Compton scattering from a tensor polarized deuteron is computed in an effective field theory. The first non-vanishing contributions to this differential cross section are the interference…

Nuclear Theory · Physics 2009-10-31 Jiunn-Wei Chen