D. Glawion
A5072959544- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Dark Matter and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Pulsars and Gravitational Waves Research
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Particle physics theoretical and experimental studies
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Astro and Planetary Science
- Radiation Detection and Scintillator Technologies
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Atomic and Subatomic Physics Research
- Solar and Space Plasma Dynamics
- Astrophysics and Star Formation Studies
- Computational Physics and Python Applications
- Noncommutative and Quantum Gravity Theories
- Nuclear Physics and Applications
- Scientific Research and Discoveries
- Economic, financial, and policy analysis
Friedrich-Alexander-Universität Erlangen-Nürnberg
2021-2024
Institut de Recherche sur les Lois Fondamentales de l'Univers
2021-2023
ETH Zurich
2017-2023
Max Planck Institute for Physics
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2023
Université de Montpellier
2023
University of Würzburg
2015-2023
CEA Paris-Saclay
2021-2023
Université Paris-Saclay
2021-2023
École Polytechnique
2023
We present the first joint analysis of gamma-ray data from MAGIC Cherenkov telescopes and Fermi Large Area Telescope (LAT) to search for signals dark matter annihilation in dwarf satellite galaxies. combine 158 hours Segue 1 observations with 6-year 15 galaxies by -LAT. obtain limits on cross-section particle masses between 10 GeV 100 TeV—the widest mass range ever explored a single analysis. These improve previously published -LAT results up factor two at certain masses. Our new inclusive...
We present the results of most comprehensive survey Galactic plane in very high-energy (VHE) gamma-rays, including a public release sky maps, catalog VHE sources, and discovery 16 new sources gamma-rays. The High Energy Spectroscopic System (H.E.S.S.) (HGPS) was decade-long observation program carried out by H.E.S.S. I array Cherenkov telescopes Namibia from 2004 to 2013. observations amount nearly 2700 h data, covering at longitudes l = 250 deg 65 latitudes |b| < 3 deg. In addition...
Gamma-ray bursts (GRBs), which are bright flashes of gamma rays from extragalactic sources followed by fading afterglow emission, associated with stellar core collapse events. We report the detection very-high-energy (VHE) GRB 190829A, between 4 and 56 hours after trigger, using High Energy Stereoscopic System (H.E.S.S.). The low luminosity redshift 190829A reduce both internal external absorption, allowing determination its intrinsic energy spectrum. Between energies 0.18 3.3 tera-electron...
SS 433 is a microquasar, stellar binary system that launches collimated relativistic jets. We observed in gamma rays using the High Energy Stereoscopic System (H.E.S.S.) and found an energy-dependent shift apparent position of gamma-ray emission from parsec-scale These observations trace energetic electron population indicate inverse Compton scattering mechanism rays. Our modeling morphology constrains location particle acceleration requires abrupt deceleration jet flow. infer presence...
Spectral lines are among the most powerful signatures for dark matter (DM) annihilation searches in very-high-energy $\gamma$-rays. The central region of Milky Way halo is one promising targets given its large amount DM and proximity to Earth. We report on a search monoenergetic spectral line from self-annihilations particles energy range 300 GeV 70 TeV using two-dimensional maximum likelihood method taking advantage both spatial features signal versus background. analysis makes use Galactic...
Aims. We investigate the extension of very high-energy spectral tail Crab Pulsar at energies above 400 GeV.
The flat-spectrum radio quasar PKS 1441+25 at a redshift of z = 0.940 is detected between 40 and 250 GeV with significance 25.5σ using the MAGIC telescopes. Together gravitationally lensed blazar QSO B0218+357 (z 0.944), most distant very high energy (VHE) to date. observations were triggered by an outburst in 2015 April seen energies Large Area Telescope on board Fermi. Multi-wavelength suggest subdivision state into two distinct flux states. In band covered MAGIC, variability timescale...
It is widely believed that the bulk of Galactic cosmic rays are accelerated in supernova remnants (SNRs). However, no observational evidence presence particles PeV energies SNRs has yet been found. The young historical SNR Cassiopeia A (Cas A) appears as one best candidates to study acceleration processes. Between December 2014 and October 2016 we observed Cas with MAGIC telescopes, accumulating 158 hours good-quality data. We derived spectrum source from 100 GeV 10 TeV. also analysed...
The central region of the Milky Way is one foremost locations to look for dark matter (DM) signatures. We report first results on a search DM particle annihilation signals using new observations from an unprecedented gamma-ray survey Galactic Center (GC) region, ${\it i.e.}$, Inner Galaxy Survey, at very high energies ($\gtrsim$ 100 GeV) performed with H.E.S.S. array five ground-based Cherenkov telescopes. No significant excess found in 2014-2020 dataset and profile likelihood ratio analysis...
Recurrent Novae are repeating thermonuclear explosions in the outer layers of white dwarfs, due to accretion fresh material from a binary companion. The shock generated by ejected slamming into companion star's wind, accelerates particles very-high-energies. We report very-high-energy (VHE, $\gtrsim100$\,GeV) gamma rays recurrent nova RS\,Ophiuchi up month after its 2021 outburst, using High Energy Stereoscopic System. VHE emission has similar temporal profile lower-energy GeV emission,...
Magnetic fields in galaxies and galaxy clusters are believed to be the result of amplification intergalactic seed during formation large-scale structures universe. However, origin, strength, morphology this magnetic field (IGMF) remain unknown. Lower limits on (or indirect detection of) IGMF can obtained from observations high-energy gamma rays distant blazars. Gamma interact with extragalactic background light produce electron-positron pairs, which subsequently initiate electromagnetic...
GRB221009A is the brightest gamma-ray burst ever detected. To probe very-high-energy (VHE, $>$\!100 GeV) emission, High Energy Stereoscopic System (H.E.S.S.) began observations 53 hours after triggering event, when brightness of moonlight no longer precluded observations. We derive differential and integral upper limits using H.E.S.S. data from third, fourth, ninth nights initial GRB detection, applying atmospheric corrections. The combined yield an energy flux limit $\Phi_\mathrm{UL}^{95\%}...
Context. QSO B0218+357 is a gravitationally lensed blazar located at redshift of 0.944. The gravitational lensing splits the emitted radiation into two components that are spatially indistinguishable by gamma-ray instruments, but separated 10–12 day delay. In July 2014, experienced violent flare observed Fermi-LAT and followed MAGIC telescopes.
Aims: We present a detailed view of the pulsar wind nebula (PWN) HESS J1825-137. aim to constrain mechanisms dominating particle transport within nebula, accounting for its anomalously large size and spectral characteristics. Methods: The is studied using deep exposure from over 12 years H.E.S.S. I operation, together with data II improving low energy sensitivity. Enhanced energy-dependent morphological spatially-resolved analyses probe Very High Energy (VHE, E > 0.1 TeV) gamma-ray...
The blazar Mrk 501 (z=0.034) was observed at very-high-energy (VHE, $E\gtrsim 100$~GeV) gamma-ray wavelengths during a bright flare on the night of 2014 June 23-24 (MJD 56832) with H.E.S.S. phase-II array Cherenkov telescopes. Data taken that by large zenith angle reveal an exceptional number photons multi-TeV energies, rapid flux variability and energy coverage extending significantly up to 20 TeV. This data set is used constrain Lorentz invariance violation (LIV) using two independent...
Shell-type supernova remnants (SNRs) are considered prime candidates for the acceleration of Galactic cosmic rays (CRs) up to knee CR spectrum at $\mathrm{E} \approx \mathrm{3}\times \mathrm{10}^\mathrm{15}$ eV. Our Milky Way galaxy hosts more than 350 SNRs discovered radio wavelengths and high energies, which 220 fall into H.E.S.S. Plane Survey (HGPS) region. Of those, only 50 coincident with a H.E.S.S source in 8 cases very high-energy (VHE) emission is firmly identified as an SNR. The GPS...
Dwarf spheroidal galaxy satellites of the Milky Way are prime targets for indirect detection dark matter with gamma rays due to their proximity, high content, and absence nonthermal emission processes. Recently, Dark Energy Survey (DES) revealed existence new ultrafaint dwarf galaxies in southern-hemisphere sky, therefore ideally located ground-based observations imaging atmospheric Cherenkov telescope array H.E.S.S. We present a search very-high-energy ($E\ensuremath{\gtrsim}100\text{...
The Crab Nebula is a unique laboratory for studying the acceleration of electrons and positrons through their non-thermal radiation. Observations very-high-energy γ rays from have provided important constraints modelling its broadband emission. We present first fully self-consistent analysis Nebula’s -ray emission between 1 GeV ∼100 TeV, that is, over five orders magnitude in energy. Using open-source software package G AMMAPY , we combined 11.4 yr data Fermi Large Area Telescope 80 h High...
We report on simultaneous broadband observations of the TeV-emitting blazar Markarian 501 between 1 April and 10 August 2013, including first detailed characterization synchrotron peak with Swift NuSTAR. During campaign, nearby BL Lac object was observed in both a quiescent an elevated state. The campaign includes NuSTAR, MAGIC, VERITAS, Fermi Large Area Telescope (LAT), X-ray UV Optical Telescope, various ground-based optical instruments, GASP-WEBT program, as well radio by OVRO,...
Abstract We search for high-energy gamma-ray emission from the binary neutron star merger GW170817 with H.E.S.S. Imaging Air Cherenkov Telescopes. The observations presented here have been obtained starting only 5.3 hr after GW170817. target selection identified regions of high probability to find a counterpart gravitational-wave event. first these contained SSS17a that has in optical range several hours our observations. can therefore present data by ground-based pointing instrument on this...
Dwarf spheroidal galaxies are among the most promising targets for detecting signals of Dark Matter (DM) annihilations. The H.E.S.S. experiment has observed five these systems a total about 130 hours. data re-analyzed here, and, in absence any detected signals, interpreted terms limits on DM annihilation cross section. Two scenarios considered: i) into mono-energetic gamma-rays and ii) form pure WIMP multiplets that, annihilating all electroweak bosons, produce distinctive gamma-ray spectral...