A5075075201- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Dark Matter and Cosmic Phenomena
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Neutrino Physics Research
- Sports Performance and Training
- Astronomy and Astrophysical Research
- Radio Astronomy Observations and Technology
- Geophysics and Gravity Measurements
- Medical Imaging Techniques and Applications
- Winter Sports Injuries and Performance
- Particle physics theoretical and experimental studies
- Sports injuries and prevention
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Astronomical Observations and Instrumentation
Universität Innsbruck
2024-2025
Laboratoire Leprince-Ringuet
2016-2017
Centre National de la Recherche Scientifique
2017
École Polytechnique
2017
Max Planck Institute for Nuclear Physics
2013
University of Potsdam
2012
Aims. We study gamma-ray emission from the shell-type supernova remnant (SNR) RX J0852.0$-$4622 to better characterize its spectral properties and distribution over SNR. Methods. The analysis of an extended High Energy Spectroscopic System (H.E.S.S.) data set at very high energies (E > 100 GeV) permits detailed studies, as well spatially resolved spectroscopy, morphology spectrum whole region. H.E.S.S. are combined with archival other wavebands interpreted in framework leptonic hadronic...
Cosmological and astrophysical observations suggest that 85% of the total matter Universe is made Dark Matter (DM). However, its nature remains one most challenging fundamental open questions particle physics. Assuming DM, this exotic form cannot consist Standard Model (SM) particles. Many models have been developed to attempt unraveling DM such as Weakly Interacting Massive Particles (WIMPs), favored candidates. WIMP annihilations decay could produce SM particles which in turn hadronize...
The colliding-wind binary system $\eta$ Carinae has been identified as a source of high-energy (HE, below $\sim$100\,GeV) and very-high-energy (VHE, above gamma rays in the last decade, making it unique among these systems. With its eccentric 5.5-year-long orbit, periastron passage, during which stars are separated by only $1-2$\,au, is an intriguing time interval to probe particle acceleration processes within system. In this work, we report on extensive VHE observation campaign that for...
Purpose : Pacing is crucial in endurance sports such as running, and its importance also prominent trail running due to the unique challenges, including high elevation gains varied terrain. This study aimed explore pacing strategies of elite athletes during 2023 World Mountain Trail Running Championships for Short distance. Methods The participants included 12 runners who provided their race data from sport watches analysis. Results findings indicate a significant decrease grade-adjusted...
The colliding-wind binary system η Carinae has been identified as a source of high-energy (HE, below ∼100,GeV) and very (VHE, above gamma rays in the last decade, making it unique among these systems. With its eccentric 5.5-year-long orbit, periastron passage, during which stars are separated by only $1-2$,au, is an intriguing time interval to probe particle acceleration processes within system. In this work, we report on extensive VHE observation campaign that for first covers full passage...
Very high-energy γ-ray emission from PKS 0447−439 was detected with the H.E.S.S. Cherenkov telescope array in December 2009. This blazar is one of brightest extragalactic objects Fermi bright source list and has a hard spectrum MeV to GeV range. In TeV range, photon index 3.89 ± 0.37 (stat) ±0.22 (sys) flux normalisation at 1 TeV, Φ1 = (3.5 1.1(stat) 0.9(sys)) × 10-13 cm-2 s-1 TeV-1 were found. The detection triggered observations X-ray band Swift RXTE telescopes. Simultaneous UV optical...
We performed a spatially resolved spectral X-ray study of the pulsar wind nebula (PWN) in supernova remnant G0.9+0.1. Furthermore we modeled its nonthermal emission and very high energy (VHE, E > 100 GeV) gamma-ray regime. Using Chandra ACIS-S3 data, investigated east-west dependence properties G0.9+0.1 by calculating hardness ratios. analyzed EPIC-MOS EPIC-pn data two on-axis observations XMM-Newton telescope extracted spectra four annulus-shaped regions, centered on region brightest...
Energetic pulsars power winds of relativistic leptons which produce photon nebulae (so- called pulsar wind nebulae, PWNe). Their spectral energy distribution has a double-humped structure: the first hump lies in X-ray regime, second gamma-ray range. The emission is generally understood as synchrotron radiation by highly energetic leptons, Inverse Compton scattering with ambient fields. evolution influenced time-dependent spin-down and decrease magnetic field strength time. Thus, present...
Observations of the Vela pulsar (PSR B0833−45) with High Energy Stereoscopic System phase II array (H.E.S.S. II) have resulted in a high-significance detection its pulsed emission down to 20 GeV. The very low-energy threshold reconstruction and analysis methods developed specifically for monoscopic mode are presented together detailed comparison results obtained five years Fermi-LAT data. A good agreement is between two instruments, thereby validating overall chain response model largest...
GRB 221009A 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 51.8 hours after triggering event, when brightness of moonlight no longer precluded observations. No significant VHE emission from detected in an analysis with H.E.S.S. data. Differential and integral upper limits are computed using data third, fourth, ninth nights initial detection GRB. The constraints derived...
Since the last H.E.S.S. publication on stellar cluster Westerlund 2 in 2011, dataset this region has increased more than three-fold exposure to $\sim220\,$h of total observation time. By applying a novel approach correct for atmospheric variations IACT data, commonly applied data quality selection criteria can be adapted exploit as much possible. In combination with current analysis techniques, it is furthermore possible disentangle and better characterise complex gamma-ray sky. Applying an...
The binary system Eta Carinae is a unique laboratory to study particle acceleration up very high energies (VHE) under wide range of conditions. Particles are thought be accelerated at shocks forming in the wind collision region. has been firmly established as source energy gamma-rays Fermi-LAT data over several orbits. With its highly eccentric orbit lasting 5.5 years, periastron passage two stars extremely close. This provides an opportunity constrain and absorption mechanisms system. was...
We introduce an alternative method for the calculation of sky maps from data taken with gamma-ray telescopes. In contrast to established smoothing 2D histogram reconstructed event directions a static kernel, we apply Kernel Density Estimation (KDE) where kernel size each candidate is related its estimated direction uncertainty. Exploiting this additional information implies gain in resulting image quality, which validated using both simulations and data. For tested simulation analysis...
We introduce an alternative method for the calculation of sky maps from data taken with gamma-ray telescopes. In contrast to established smoothing 2D histogram reconstructed event directions a static kernel, we apply Kernel Density Estimation (KDE) where kernel size each candidate is related its estimated direction uncertainty. Exploiting this additional information implies gain in resulting image quality, which validated using both simulations and data. For tested simulation analysis...
Gamma-ray bursts (GRBs) are some of the most energetic and exotic events in Universe, however their behaviour at highest energies (>10 GeV) is largely unknown. Although Fermi-LAT space telescope has detected several GRBs this energy range, it limited by relatively small collection area instrument. The H.E.S.S. experiment now entered its second phase adding a fifth 600 m$^{2}$ mirror to centre array. This new increases range array, allowing probe sub-100 GeV while maintaining large ground...
Gamma-ray bursts (GRBs) are some of the Universe's most enigmatic and exotic events. However, at energies above 10 GeV their behaviour remains largely unknown. Although space based telescopes such as Fermi-LAT have been able to detect GRBs in this energy range, photon statistics limited by small detector size. Such limitations not present ground gamma-ray H.E.S.S. experiment, which has now entered its second phase with addition a large 600 m2 telescope centre array. allows access sub 100-GeV...
We present a radially symmetric leptonic model which allows to reproduce the spectral properties of X-ray emission several regions inside young PWN. Using optimized parameter values obtained from analysis, it is possible calculate IC lepton population and compare with data in very high-energy range (E > 100GeV). This method has been applied three PWNe, namely MSH15−52, G0.9+0.1, G21.5−0.9.
Among Galactic VHE (very high energy, E > 100 GeV) γ-ray sources, pulsar wind nebulae (PWNe) form the most abundant class. At same time, there are numerous sources of γ-rays which still unidentified. A firm identification such objects requires a counterpart at other wavelengths. Middle-aged PWNe may account for many these unidentified sources. While leptons that have been injected into PWN long time ago can cause observed flux, present energy output is significantly reduced with respect to...