O. 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: 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: 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: 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: Cosmic-ray propagation under consideration of a spatially resolved source distribution
Cosmic-ray propagation under consideration of a spatially resolved source distribution Open
The different elements of the interstellar medium have been continuously sampled through direct and indirect measurements of various messengers, such as cosmic rays (CRs). In addition to observations, numerical simulations of CR propagatio…
View article: The 2020 periastron of Eta Carinae at high-energies
The 2020 periastron of Eta Carinae at high-energies Open
Colliding-wind binaries are massive stellar systems featuring strong, interacting stellar winds. The resulting shocks may act as effective particle accelerators, making them good candidates for detection at high energies. However, only the…
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…
View article: The Fermi-LAT Light Curve Repository
The Fermi-LAT Light Curve Repository Open
The Fermi Large Area Telescope (LAT) light curve repository (LCR) is a\npublicly available, continually updated library of gamma-ray light curves of\nvariable Fermi-LAT sources generated over multiple timescales. The Fermi-LAT\nLCR aims to…
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 dis…
View article: The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope: Data Release 3
The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope: Data Release 3 Open
An incremental version of the fourth catalog of active galactic nuclei (AGNs) detected by the Fermi Large Area Telescope is presented. This version (4LAC-DR3) derives from the third data release of the 4FGL catalog based on 12 yr of E > 50…
View article: The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope -- Data Release 3
The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope -- Data Release 3 Open
An incremental version of the fourth catalog of active galactic nuclei (AGNs) detected by the Fermi-Large Area Telescope is presented. This version (4LAC-DR3) derives from the third data release of the 4FGL catalog based on 12 years of E>5…
View article: Cosmic-ray propagation under consideration of a spatially resolved source distribution
Cosmic-ray propagation under consideration of a spatially resolved source distribution Open
Cosmic rays (CRs) are an integral component of the interstellar medium, producing broadband emission while interacting with other Galactic matter components like the interstellar gas or magnetic fields. In addition to observations, numeric…
View article: Search for Dark Matter Annihilation Signals in the H.E.S.S. Inner Galaxy Survey
Search for Dark Matter Annihilation Signals in the H.E.S.S. Inner Galaxy Survey Open
The central region of the Milky Way is one of the foremost locations to look for dark matter (DM) signatures. We report the first results on a search for DM particle annihilation signals using new observations from an unprecedented $γ$-ray…
View article: Cosmic-ray propagation under consideration of a spatially resolved source distribution
Cosmic-ray propagation under consideration of a spatially resolved source distribution Open
Cosmic rays (CRs) are an integral component of the interstellar medium, producing broadband emission while interacting with other Galactic matter components like the interstellar gas or magnetic fields. In addition to observations, numeric…
View article: Search for New Cosmic-Ray Acceleration Sites within the 4FGL Catalog Galactic Plane Sources
Search for New Cosmic-Ray Acceleration Sites within the 4FGL Catalog Galactic Plane Sources Open
Cosmic rays are mostly composed of protons accelerated to relativistic speeds. When those protons encounter interstellar material, they produce neutral pions, which in turn decay into gamma-rays. This offers a compelling way to identify th…
View article: Gamma Rays from Fast Black-hole Winds
Gamma Rays from Fast Black-hole Winds Open
Massive black holes at the centers of galaxies can launch powerful wide-angle winds that, if sustained over time, can unbind the gas from the stellar bulges of galaxies. These winds may be responsible for the observed scaling relation betw…
View article: Catalog of Long-term Transient Sources in the First 10 yr of Fermi-LAT Data
Catalog of Long-term Transient Sources in the First 10 yr of Fermi-LAT Data Open
We present the first Fermi Large Area Telescope (LAT) catalog of long-term γ -ray transient sources (1FLT). This comprises sources that were detected on monthly time intervals during the first decade of Fermi-LAT operations. The monthly ti…
View article: Performance of the new FlashCam-based camera in the 28m telescope of H.E.S.S.
Performance of the new FlashCam-based camera in the 28m telescope of H.E.S.S. Open
In October 2019, the central 28 m telescope of the H.E.S.S. experiment has\nbeen upgraded with a new camera. The camera is based on the FlashCam design\nwhich has been developed in view of a possible future implementation in the\nMedium-Si…
View article: Probing Dark Matter and Fundamental Physics with the Cherenkov Telescope Array
Probing Dark Matter and Fundamental Physics with the Cherenkov Telescope Array Open
Astrophysical observations provide strong evidence that more than 80% of all matter in the Universe is in the form of dark matter (DM). Two leading candidates of particles beyond the Standard Model that could constitute all or a fraction o…
View article: Origin and role of relativistic cosmic particles
Origin and role of relativistic cosmic particles Open
This white paper briefly summarizes the importance of the study of relativistic cosmic rays, both as a constituent of our Universe, and through their impact on stellar and galactic evolution. The focus is on what can be learned over the co…
View article: Relativistic fluid modelling of gamma-ray binaries
Relativistic fluid modelling of gamma-ray binaries Open
Context. In the first paper of this series, we presented a numerical model for the non-thermal emission of gamma-ray binaries in a pulsar-wind-driven scenario. Aims. We apply this model to one of the best-observed gamma-ray binaries, the L…
View article: The First Fermi-LAT Solar Flare Catalog Appendix
The First Fermi-LAT Solar Flare Catalog Appendix Open
We present the appendix of the First Fermi-Large Area Telescope (LAT) Solar flare catalog covering the 24thSolar cycle. The catalog (published in ApJS) contains 45 Fermi-LAT Solar flares (FLSFs) with emission in theγ-ray energy band (30 Me…
View article: The First Fermi-LAT Solar Flare Catalog Appendix
The First Fermi-LAT Solar Flare Catalog Appendix Open
We present the appendix of the First Fermi-Large Area Telescope (LAT) Solar flare catalog covering the 24thSolar cycle. The catalog (published in ApJS) contains 45 Fermi-LAT Solar flares (FLSFs) with emission in theγ-ray energy band (30 Me…
View article: Galactic cosmic ray propagation models using Picard
Galactic cosmic ray propagation models using Picard Open
We will give an overview of recent developments in numerical modelling of CR transport in our Galaxy with the PICARD code. Corresponding numerical models aim at reproducing CR spectra and also diffuse gamma-ray emission from the Galaxy by …