14.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR1.6k papers
- Institut National de Physique Nucléaire et de Physique des ParticulesFR1.4k papers
- Heidelberg UniversityDE1.3k papers
- Max Planck SocietyDE1.1k papers
- University of ZurichCH1.1k papers
- European Organization for Nuclear ResearchCH1k papers
- Laboratoire de Physique Nucléaire et de Hautes ÉnergiesFR990 papers
- Institute of Nuclear Physics, Polish Academy of SciencesPL973 papers
- University of Maryland, College ParkUS940 papers
- Rutherford Appleton LaboratoryGB939 papers
- Institute for Nuclear ResearchRU922 papers
- Istituto Nazionale di Fisica Nucleare, Sezione di BolognaIT912 papers
15 papers · 2 filters
Very High Energy Photons in Universe
F. A. Aharonian
I discuss the recent exciting results of discovery of TeV photons from several galactic and extragalactic sources, and highlight some objectives of VHE gamma ray astronomy that can…
Characteristics of the Multi-Telescope Coincidence Trigger of the HEGRA IACT System
N. Bulian, A. Daum, G. Hermann +12
The HEGRA--collaboration is operating a system of imaging atmospheric Cherenkov telescopes to search for sources of TeV-gamma-rays. Air showers are observed in stereoscopic mode wi…
Stereo Imaging of VHE Gamma-Ray Sources
F. A. Aharonian, A. K. Konopelko
We describe the features of the stereoscopic approach in the imaging atmospheric Cherenkov technique, and discuss the performance of future low threshold telescope arrays.
Particle Acceleration and Gamma-Ray Production in Shell Remnants
H. J. Volk
A number of nearby Northern Hemisphere shell-type Supernova Remnants (SNRs) has been observed in TeV gamma rays, but none of them could be detected so far. This failure calls for a…
In Situ Measurements of Interstellar Dust
M. Landgraf, E. Gruen
We present the mass distribution of interstellar grains measured in situ by the Galileo and Ulysses spaceprobes as cumulative flux. The derived in situ mass distribution per logari…
Modelling of the nonthermal flares in the galactic microquasar GRS 1915+105
A. M. Atoyan, F. A. Aharonian
We study the temporal and spectral evolution of the radio flares detected from the relativistic ejecta in the microquasar GRS 1915+105, and develop a model which suggests that thes…
Measuring Gamma-Ray Energy Spectra with the HEGRA IACT System
W. Hofmann
The stereoscopic reconstruction of air showers viewed by multiple imaging atmospheric Cherenkov telescopes (IACTs) allows a more precise reconstruction of shower energies and hence…
GRS 1915+105: the flux ratio of twin radio clouds as a measure of asymmetry between counter jets
A. M. Atoyan, F. A. Aharonian
Resolution of both approaching and receding ejecta in the galactic microquasars makes possible to measure the flux ratio S_a/S_r of the twin ejecta, which contains an important inf…
Bifurcation, efficiency, and the role of injection in shock acceleration with the Bohm diffusion
M. A. Malkov
The efficiency and uniqueness of the diffusive shock acceleration is studied on the basis of the novel kinetic solutions. These solutions obtained earlier (paper I, astro-ph/970715…
Particle acceleration at shocks in relativistic jets
J. G. Kirk
The theory of particle acceleration at shock fronts is briefly reviewed, with special emphasis on the production of the particles responsible for the nonthermal emission from blaza…
An improved technique of image analysis for IACTs and IACT Systems
M. Ulrich, A. Daum, G. Hermann +1
In order to better utilize the information contained in the shower images generated by imaging Cherenkov telescopes (IACTs) equipped with cameras with small pixels, images are fit…
Calibration of the Sensitivity of Imaging Atmospheric Cherenkov Telescopes using a Reference Light Source
A. Frass, C. Koehler, G. Hermann +2
The sensitivity of an Imaging Atmospheric Cherenkov telescope is calibrated by shining, from a distant pulsed monochromatic light source, a defined photon flux onto the mirror. The…
Study of the synchrotron and inverse Compton radiations of relativistic jets in GRS 1915+105
A. M. Atoyan, F. A. Aharonian
Comparison of the detailed calculations of the synchrotron radiation of expanding magnetized clouds with the temporal and spectral evolution of radio flares observed from the recen…
X-ray Spectral Formation in a Converging Fluid Flow: Spherical Accretion into Black Holes
L. Titarchuk, A. Mastichiadis, N. D. Kylafis
We study Compton upscattering of low-frequency photons in a converging flow of thermal plasma. The photons escape diffusively and electron scattering is the dominant source of opac…
The HEGRA Experiment - Status and Recent Results
F. A. Aharonian, G. Heinzelmann, :
A report is given on the status and recent results from the HEGRA imaging atmospheric Cherenkov telescopes (IACT) concerning Mrk 501 and GRS 1915+105 and on recent results from the…