A. Reimer
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View article: Puzzling Variation of Gamma Rays from the Sun over the Solar Cycle Revealed with Fermi-LAT
Puzzling Variation of Gamma Rays from the Sun over the Solar Cycle Revealed with Fermi-LAT Open
The steady-state gamma-ray emission from the Sun is thought to consist of two emission components due to interactions with Galactic cosmic rays: (1) a hadronic disk component, and (2) a leptonic extended component peaking at the solar edge…
View article: A Systematic Search for MeV–GeV Pulsar Wind Nebulae without Gamma-Ray Detected Pulsars
A Systematic Search for MeV–GeV Pulsar Wind Nebulae without Gamma-Ray Detected Pulsars Open
An increasing number of pulsar wind nebulae (PWNe) are being identified in the TeV band by ground-based Imaging Air Cherenkov Telescopes such that they constitute the dominant source class of Galactic TeV emitters. However, MeV–GeV PWN cou…
View article: The H.E.S.S. extragalactic sky survey with the first decade of observations
The H.E.S.S. extragalactic sky survey with the first decade of observations Open
The results of the first extragalactic gamma-ray survey by the High Energy Stereoscopic System (H.E.S.S.) are presented. The survey comprises 2720 hours of very high-energy gamma-ray observations of the extragalactic sky, recorded with H.E…
View article: Fermi detection of gamma-ray Emission from the Hot Coronae of Radio-quiet Active Galactic Nuclei
Fermi detection of gamma-ray Emission from the Hot Coronae of Radio-quiet Active Galactic Nuclei Open
Relativistic jets around supermassive black holes (SMBHs) are well-known powerful $γ$-ray emitters. In absence of the jets in radio-quiet active galactic nuclei (AGNs), how the SMBHs work in $γ$-ray bands is still unknown despite of great …
View article: Exploring NGC 3603 non-thermal emission through a realistic modelling of its environment
Exploring NGC 3603 non-thermal emission through a realistic modelling of its environment Open
We study the young and compact star-forming region NGC 3603, a well known γ-ray emitter. We build a novel non-thermal emission model by creating realistic 3D distributions of the gas and the radiation field in the region. We introduce thes…
View article: Combined Fit of Spectrum and Composition for FR0 Radio-galaxy-emitted Ultra–high energy Cosmic Rays with Resulting Secondary Photons and Neutrinos
Combined Fit of Spectrum and Composition for FR0 Radio-galaxy-emitted Ultra–high energy Cosmic Rays with Resulting Secondary Photons and Neutrinos Open
This study comprehensively investigates the gamma-ray dim population of Fanaroff–Riley Type 0 (FR0) radio galaxies as potentially significant sources of ultra–high energy cosmic rays (UHECRs, E > 10 18 eV) detected on Earth. While individu…
View article: Periodic Gamma-Ray Modulation of the Blazar PG 1553+113 Confirmed by Fermi-LAT and Multiwavelength Observations
Periodic Gamma-Ray Modulation of the Blazar PG 1553+113 Confirmed by Fermi-LAT and Multiwavelength Observations Open
A 2.1 yr periodic oscillation of the gamma-ray flux from the blazar PG 1553+113 has previously been tentatively identified in ∼7 yr of data from the Fermi Large Area Telescope. After 15 yr of Fermi sky-survey observations, doubling the tot…
View article: A Comprehensive Hadronic Code Comparison for Active Galactic Nuclei
A Comprehensive Hadronic Code Comparison for Active Galactic Nuclei Open
We perform the first dedicated comparison of five hadronic codes (AM$^3$, ATHE$ν$A, B13, LeHa-Paris, and LeHaMoC) that have been extensively used in modeling of the spectral energy distribution (SED) of jetted active galactic nuclei. The p…
View article: Search for Extended GeV Sources in the Inner Galactic Plane
Search for Extended GeV Sources in the Inner Galactic Plane Open
The recent detection of extended $γ$-ray emission around middle-aged pulsars is interpreted as inverse-Compton scattering of ambient photons by electron-positron pairs escaping the pulsar wind nebula, which are confined near the system by …
View article: Exploring non-thermal emission from the star-forming region NGC 3603 through a realistic modelling of its environment
Exploring non-thermal emission from the star-forming region NGC 3603 through a realistic modelling of its environment Open
Context. Star-forming regions are gaining considerable interest in the high-energy astrophysics community as possible Galactic particle accelerators. In general, the role of electrons has not been fully considered in this kind of cosmic-ra…
View article: Characterizing the γ-Ray Emission from FR0 Radio Galaxies
Characterizing the γ-Ray Emission from FR0 Radio Galaxies Open
FR0 galaxies constitute the most abundant jet population in the local Universe. With their compact jet structure, they are broadband photon emitters and have been proposed as multimessenger sources. Recently, these sources have been detect…
View article: Combined Fit of Spectrum and Composition for FR0 Radio-galaxy-emitted Ultra-high-energy Cosmic Rays with Resulting Secondary Photons and Neutrinos
Combined Fit of Spectrum and Composition for FR0 Radio-galaxy-emitted Ultra-high-energy Cosmic Rays with Resulting Secondary Photons and Neutrinos Open
This study comprehensively investigates the gamma-ray dim population of Fanaroff-Riley Type 0 (FR0) radio galaxies as potentially significant sources of ultra-high-energy cosmic rays (UHECRs, E $>$ 10$^{18}$ eV) detected on Earth. While in…
View article: Very-high-energy γ-Ray Emission from Young Massive Star Clusters in the Large Magellanic Cloud
Very-high-energy γ-Ray Emission from Young Massive Star Clusters in the Large Magellanic Cloud Open
The Tarantula Nebula in the Large Magellanic Cloud is known for its high star formation activity. At its center lies the young massive star cluster R136, providing a significant amount of the energy that makes the nebula shine so brightly …
View article: Curvature in the very-high energy gamma-ray spectrum of M 87
Curvature in the very-high energy gamma-ray spectrum of M 87 Open
The radio galaxy M 87 is a variable very-high energy (VHE) gamma-ray source, exhibiting three major flares, which were reported in 2005, 2008, and 2010. Despite extensive studies, the origin of the VHE gamma-ray emission is not yet fully u…
View article: Investigation of Multi-Messenger Properties of FR0 Radio Galaxy Emitted Ultra-High Energy Cosmic Rays
Investigation of Multi-Messenger Properties of FR0 Radio Galaxy Emitted Ultra-High Energy Cosmic Rays Open
The low luminosity Fanaroff-Riley type 0 (FR0) radio galaxies are amongst potential contributors to the observed flux of ultra-high energy cosmic rays (UHECRs). Due to their much higher abundance in the local universe with respect to more …
View article: Low-luminosity jetted AGN as particle multi-messenger sources
Low-luminosity jetted AGN as particle multi-messenger sources Open
Gamma rays, high-energy neutrinos and cosmic rays (CRs) impinging on Earth signal the existence of environments in the Universe that allow acceleration of particle populations into the extremely energetic regime. In order to understand the…
View article: Characterizing the $γ$-ray Emission from FR0 Radio Galaxies
Characterizing the $γ$-ray Emission from FR0 Radio Galaxies Open
FR0 galaxies constitute the most abundant jet population in the local Universe. With their compact jet structure, they are broadband photon emitters and have been proposed as multi-messenger sources. Recently, these sources have been detec…
View article: ExHaLe-jet: Modeling blazar jets with an extended hadro-leptonic radiation code
ExHaLe-jet: Modeling blazar jets with an extended hadro-leptonic radiation code Open
International audience
View article: On the Subparsec-scale Core Composition of FR 0 Radio Galaxies
On the Subparsec-scale Core Composition of FR 0 Radio Galaxies Open
Although Fanaroff–Riley type 0 (FR 0) radio galaxies are known to be the most numerous jet population in the local Universe, they are much less explored than the well-established class of FR type I (FR I) and FR type II galaxies due to the…
View article: Spine-sheath jet model for low-luminosity AGNs
Spine-sheath jet model for low-luminosity AGNs Open
In several jetted AGNs, structured jets have been observed. In particular spine-sheath configurations where the jet is radially divided into two or more zones of different flow velocities.\n\nWe present a model based on the particle and ra…
View article: A novel approach to identify blazar emission states using clustering algorithms
A novel approach to identify blazar emission states using clustering algorithms Open
Even after decades of multi-wavelength (MWL) observations, blazars still\nremain mysterious objects. Their extreme variability and variety of emission\ncharacteristics observed during different time periods make it hard to\nunderstand the …
View article: CR-ENTREES -- Cosmic-Ray ENergy TRansport in timE-Evolving astrophysical Settings
CR-ENTREES -- Cosmic-Ray ENergy TRansport in timE-Evolving astrophysical Settings Open
In order to understand observable signatures from putative cosmic-ray (CR) sources in-source acceleration of particles, their energy and time-dependent transport including interactions in an evolving environment and their escape from sourc…
View article: Efficient Modeling of Heavy Cosmic Rays Propagation in Evolving Astrophysical Environments
Efficient Modeling of Heavy Cosmic Rays Propagation in Evolving Astrophysical Environments Open
We present a new energy transport code that models the time dependent and non-linear evolution of spectra of cosmic-ray nuclei, their secondaries, and photon target fields. The software can inject an arbitrary chemical composition includin…
View article: Investigation of Multi-Messenger Properties of FR0 Radio Galaxy Emitted Ultra-High Energy Cosmic Rays
Investigation of Multi-Messenger Properties of FR0 Radio Galaxy Emitted Ultra-High Energy Cosmic Rays Open
This study investigates low luminosity Fanaroff-Riley Type 0 (FR0) radio galaxies as a potentially significant source of ultra-high energy cosmic rays (UHECRs). Due to their much higher prevalence in the local universe compared to more pow…
View article: ExHaLe-jet: Modeling blazar jets with an extended hadro-leptonic radiation code
ExHaLe-jet: Modeling blazar jets with an extended hadro-leptonic radiation code Open
Blazars emit across all electromagnetic wavelengths. While the so-called one-zone model has described well both quiescent and flaring states, it cannot explain the radio emission and fails in more complex data sets, such as AP Librae. In o…
View article: Constraints on the Intergalactic Magnetic Field Using Fermi-LAT and H.E.S.S. Blazar Observations
Constraints on the Intergalactic Magnetic Field Using Fermi-LAT and H.E.S.S. Blazar Observations Open
Magnetic fields in galaxies and galaxy clusters are believed to be the result of the amplification of intergalactic seed fields during the formation of large-scale structures in the universe. However, the origin, strength, and morphology o…
View article: The Fermi-LAT Lightcurve Repository*
The Fermi-LAT Lightcurve Repository* Open
The Fermi Large Area Telescope (LAT) lightcurve repository (LCR) is a publicly available, continually updated library of gamma-ray lightcurves of variable Fermi-LAT sources generated over multiple timescales. The Fermi-LAT LCR aims to prov…
View article: Limits on the non-thermal emission of the WR–WR system Apep
Limits on the non-thermal emission of the WR–WR system Apep Open
Colliding-wind binaries (CWBs) constitute an emerging class of γ -ray sources powered by strong, dense winds in massive stellar systems. The most powerful of them are those binaries hosting a Wolf-Rayet (WR) star. Following the recent disc…