F. Aharonian
A5042972881- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Dark Matter and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Neutrino Physics Research
- Radio Astronomy Observations and Technology
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Solar and Space Plasma Dynamics
- Radiation Detection and Scintillator Technologies
- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Particle physics theoretical and experimental studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Radiation Therapy and Dosimetry
- Geophysics and Gravity Measurements
- Ionosphere and magnetosphere dynamics
- Nuclear Physics and Applications
- High-pressure geophysics and materials
- Atomic and Subatomic Physics Research
Dublin Institute For Advanced Studies
2016-2025
Max Planck Institute for Nuclear Physics
2016-2025
EarthTech International (United States)
2013-2024
Yerevan State University
2023-2024
Gran Sasso Science Institute
2014-2024
University of Science and Technology of China
2021-2024
Purple Mountain Observatory
2024
Chinese Academy of Sciences
2024
Geological Exploration Technology Institute of Jiangsu Province
2024
Campbell Collaboration
2015-2023
Ground-based gamma-ray astronomy has had a major breakthrough with the impressive results obtained using systems of imaging atmospheric Cherenkov telescopes. huge potential in astrophysics, particle physics and cosmology. CTA is an international initiative to build next generation instrument, factor 5-10 improvement sensitivity 100 GeV 10 TeV range extension energies well below above TeV. will consist two arrays (one north, one south) for full sky coverage be operated as open observatory....
We present new parameterizations of energy spectra secondary particles, $\ensuremath{\pi}$ mesons, gamma rays, electrons, and neutrinos produced in inelastic proton-proton collisions. The simple analytical approximations based on simulations interactions using the public available SIBYLL code provide very good accuracy for distributions products range above 100 GeV. Generally, recommended formulas deviate from simulated within a few percent over large $x={E}_{i}/{E}_{p}$---the fraction...
The Crab nebula was observed with the H.E.S.S. stereoscopic Cherenkov-telescope array between October 2003 and January 2005 for a total of 22.9 hours (after data quality selection). Observations were made three operational telescopes in late complete 4 telescope - February 2004 2005. observations are discussed used as an example to detail flux spectral analysis procedures H.E.S.S., evaluate systematic uncertainties measurements. spectrum gamma-rays from source calculated on run-by-run...
The high-frequency peaked BL Lac PKS 2155-304 at redshift z = 0.116 is a well-known VHE (>100 GeV) γ-ray emitter. Since 2002 its flux has been monitored using the H.E.S.S. stereoscopic array of imaging atmospheric Cerenkov telescopes in Namibia. During 2006 July dark period, average was measured to be more than 10 times typical values observed from object. This article focuses solely on an extreme outburst detected early hours 28 (MJD 53,944). during this I(>200 (1.72 ± 0.05stat 0.34syst) ×...
The very large collection area of ground-based gamma-ray telescopes gives them a substantial advantage over balloon or satellite based instruments in the detection very-high-energy (>600 GeV) cosmic-ray electrons. Here we present electron spectrum derived from data taken with High Energy Stereoscopic System (H.E.S.S.) imaging atmospheric Cherenkov telescopes. In this measurement, first type, are able to extend measurement beyond range accessible direct measurements. We find evidence for...
We report on a survey of the inner part Galactic Plane in very high energy gamma-rays, with H.E.S.S. Cherenkov telescope system. The between +-30deg longitude and +-3deg latitude relative to Centre was observed 500 pointings for total 230 hours, reaching an average flux sensitivity 2% Crab Nebula at energies above 200 GeV. Fourteen previously unknown sources were detected significance level greater than 4 sigma after accounting all trials involved search. Initial results eight most...
The measurement of an excess in the cosmic-ray electron spectrum between 300 and 800 GeV by ATIC experiment has - together with PAMELA detection a rise positron fraction up to 100 motivated many interpretations terms dark matter scenarios; alternative explanations assume nearby source like pulsar or supernova remnant. Here we present H.E.S.S. starting at 340 GeV. While overall flux measured is consistent data within statistical systematic errors, exclude pronounced peak as suggested for...
We report the detection of a point-like source very high energy (VHE) gamma-rays coincident within 1' Sgr A*, obtained with H.E.S.S. array Cherenkov telescopes. The exhibit power-law spectrum spectral index -2.2 +/- 0.09 0.15 and flux above 165 GeV threshold (1.82 0.22) * 10^-7 m^-2 s^-1. measured differ substantially from recent results reported in particular by CANGAROO collaboration.
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...
The inner region of the Milky Way halo harbors a large amount dark matter (DM). Given its proximity, it is one most promising targets to look for DM. We report on search annihilations DM particles using γ-ray observations towards 300 pc Way, with H.E.S.S. array ground-based Cherenkov telescopes. analysis based 2D maximum likelihood method Galactic Center (GC) data accumulated by over last 10 years (2004-2014), and does not show any significant signal above background. Assuming Einasto...
Using publicly available Monte Carlo codes as well compilation of published data on p--p interactions for proton kinetic energy below 2 GeV, we parametrize the spectra and production rates $\gamma$-rays by simple but quite accurate ($\leq 20 \%$) analytical expressions in a broad range from kinematic threshold to PeV energies.
A search for a very-high-energy (VHE; ≥100 GeV) γ-ray signal from self-annihilating particle dark matter (DM) is performed towards region of projected distance r∼45-150 pc the Galactic center. The background-subtracted spectrum measured with High Energy Stereoscopic System (H.E.S.S.) instrument in energy range between 300 GeV and 30 TeV shows no hint residual flux. Assuming conventional Navarro-Frenk-White Einasto density profiles, limits are derived on velocity-weighted annihilation cross...
Gamma-ray line signatures can be expected in the very-high-energy (${E}_{\ensuremath{\gamma}}>100\text{ }\text{ }\mathrm{GeV}$) domain due to self-annihilation or decay of dark matter (DM) particles space. Such a signal would readily distinguishable from astrophysical $\ensuremath{\gamma}$-ray sources that most cases produce continuous spectra span over several orders magnitude energy. Using data collected with H.E.S.S. instrument, upper limits on linelike emission are obtained energy range...
High-energy photons from the Crab Nebula The contains a pulsar that excites surrounding gas to emit high-energy radiation. combination of pulsar's youth and nearby location makes nebula brightest gamma-ray source in sky. LHAASO Collaboration report observations this at energies tera– peta–electron volts, extending spectrum prototypical object. They combine these data with lower model physics emission process. multiwave-length can be explained by synchrotron radiation inverse Compton...