Ashot Chilingarian | Yerevan Physics Institute (original) (raw)

Address: Yerevan, Yerevan, Armenia

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Papers by Ashot Chilingarian

Research paper thumbnail of Research of the Galactic Cosmic Rays from

Measured intensities of the galactic cosmic rays are described rather satisfactory till energy 10... more Measured intensities of the galactic cosmic rays are described rather satisfactory till energy 1017 eV by the acceleration of protons and nuclei in supernovae explosion blasts in presence of strong magnetic fields. At 1015eV this mechanism faded producing the first "proton" knee; at 1017eV, the iron nuclei also cannot gain additional energy crossing SNR generated shock The energy domain 1017eV 1018eV is an enigmatic region where may be mysterious extragalactic CRs, presumably produced in Active Galactic Nuclei are mixing with fading galactic iron flux. There are different scenarios of mixing of both components and absolutely not enough experimental evidence for comparisons. KASCADE, MAKET-ANI and HighRes data seem to suggest a "bump" after 1017 eV, although error bars are too large for the physical inference. AKENO data suggested rather smooth transition. This important question of transition from galactic to extragalactic component can only be solved by measurin...

Research paper thumbnail of Exploring the Origin of High-Energy Particle Beams in the Atmosphere

Eos, Transactions American Geophysical Union, 2014

Research paper thumbnail of Properties of the Site and Layout of the Pierre Auger Observatory

Research paper thumbnail of Registration of the Solar Activity during Cycle-23 with the ANI Cosmic Ray Observatory facilities

Research paper thumbnail of Investigation of the pseudorapidity and momentum of muons in EAS with the KASCADE muon tracking detector

Nuclear Physics B - Proceedings Supplements, 2006

Research paper thumbnail of Investigation of hadronic interaction models with the KASCADE experiment

Nuclear Physics B - Proceedings Supplements, 2006

Research paper thumbnail of The comparison of Bayesian and neural techniques in problems of classification to multiple categories

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1997

Research paper thumbnail of Composition and energy spectra of elemental groups around the knee: Results from KASCADE

A composition analysis of KASCADE air shower data is performed by means of unfolding the two-dime... more A composition analysis of KASCADE air shower data is performed by means of unfolding the two-dimensional electron-muon number spectrum in energy spectra of 5 elemental groups. The results of the analysis are based on a vast number of Monte Carlo simulations with the two different high-energy hadronic interaction models QGSJet and SIBYLL. For both models the light elemental groups show a distinctive knee feature, causing the knee in the all particle spectrum at around 4 PeV, whereas heavy primaries do not. The relative abundancies of the elemental groups show a large model dependence. Moreover, the description of the data by the simulations shows to be imperfect and sensitive to the characteristics of the interaction model used.

Research paper thumbnail of Flux Upper Limit on Gamma-Ray Emission by GRB 050713a from MAGIC Telescope Observations

The Astrophysical Journal, 2006

Research paper thumbnail of The Primary Proton Spectrum of Cosmic Rays Measured with Single Hadrons at Ground Level

The Astrophysical Journal, 2004

Research paper thumbnail of VHE γ‐Ray Observation of the Crab Nebula and its Pulsar with the MAGIC Telescope

The Astrophysical Journal, 2008

Research paper thumbnail of Discovery of Very High Energy Gamma Rays from 1ES 1218+30.4

The Astrophysical Journal, 2006

Research paper thumbnail of Constraints on the Steady and Pulsed Very High Energy Gamma‐Ray Emission from Observations of PSR B1951 \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usep...

The Astrophysical Journal, 2007

Research paper thumbnail of MAGIC Upper Limits on the Very High Energy Emission from Gamma‐Ray Bursts

The Astrophysical Journal, 2007

Research paper thumbnail of Upper Limit for γ‐Ray Emission above 140 GeV from the Dwarf Spheroidal Galaxy Draco

The Astrophysical Journal, 2008

Research paper thumbnail of Detection of the High-Energy Cosmic Rays from the Monogem Ring

The Astrophysical Journal, 2003

Research paper thumbnail of Very-High-Energy Gamma Rays from a Distant Quasar: How Transparent Is the Universe?

Science, 2008

The atmospheric Cherenkov gamma-ray telescope MAGIC, designed for a low-energy threshold, has det... more The atmospheric Cherenkov gamma-ray telescope MAGIC, designed for a low-energy threshold, has detected very-high-energy gamma rays from a giant flare of the distant Quasi-Stellar Radio Source (in short: radio quasar) 3C 279, at a distance of more than 5 billion light-years (a redshift of 0.536). No quasar has been observed previously in very-high-energy gamma radiation, and this is also the most distant object detected emitting gamma rays above 50 gigaelectron volts. Because high-energy gamma rays may be stopped by interacting with the diffuse background light in the universe, the observations by MAGIC imply a low amount for such light, consistent with that known from galaxy counts.

Research paper thumbnail of Probing quantum gravity using photons from a flare of the active galactic nucleus Markarian 501 observed by the MAGIC telescope

Research paper thumbnail of On the accuracy of the primary energy and nuclei determination at mountain altitudes and sea level

Nuclear Physics B - Proceedings Supplements, 1997

Research paper thumbnail of Determination of primary energy and mass in the PeV region by Bayesian unfolding techniques

Nuclear Physics B - Proceedings Supplements, 2003

Research paper thumbnail of Research of the Galactic Cosmic Rays from

Measured intensities of the galactic cosmic rays are described rather satisfactory till energy 10... more Measured intensities of the galactic cosmic rays are described rather satisfactory till energy 1017 eV by the acceleration of protons and nuclei in supernovae explosion blasts in presence of strong magnetic fields. At 1015eV this mechanism faded producing the first "proton" knee; at 1017eV, the iron nuclei also cannot gain additional energy crossing SNR generated shock The energy domain 1017eV 1018eV is an enigmatic region where may be mysterious extragalactic CRs, presumably produced in Active Galactic Nuclei are mixing with fading galactic iron flux. There are different scenarios of mixing of both components and absolutely not enough experimental evidence for comparisons. KASCADE, MAKET-ANI and HighRes data seem to suggest a "bump" after 1017 eV, although error bars are too large for the physical inference. AKENO data suggested rather smooth transition. This important question of transition from galactic to extragalactic component can only be solved by measurin...

Research paper thumbnail of Exploring the Origin of High-Energy Particle Beams in the Atmosphere

Eos, Transactions American Geophysical Union, 2014

Research paper thumbnail of Properties of the Site and Layout of the Pierre Auger Observatory

Research paper thumbnail of Registration of the Solar Activity during Cycle-23 with the ANI Cosmic Ray Observatory facilities

Research paper thumbnail of Investigation of the pseudorapidity and momentum of muons in EAS with the KASCADE muon tracking detector

Nuclear Physics B - Proceedings Supplements, 2006

Research paper thumbnail of Investigation of hadronic interaction models with the KASCADE experiment

Nuclear Physics B - Proceedings Supplements, 2006

Research paper thumbnail of The comparison of Bayesian and neural techniques in problems of classification to multiple categories

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1997

Research paper thumbnail of Composition and energy spectra of elemental groups around the knee: Results from KASCADE

A composition analysis of KASCADE air shower data is performed by means of unfolding the two-dime... more A composition analysis of KASCADE air shower data is performed by means of unfolding the two-dimensional electron-muon number spectrum in energy spectra of 5 elemental groups. The results of the analysis are based on a vast number of Monte Carlo simulations with the two different high-energy hadronic interaction models QGSJet and SIBYLL. For both models the light elemental groups show a distinctive knee feature, causing the knee in the all particle spectrum at around 4 PeV, whereas heavy primaries do not. The relative abundancies of the elemental groups show a large model dependence. Moreover, the description of the data by the simulations shows to be imperfect and sensitive to the characteristics of the interaction model used.

Research paper thumbnail of Flux Upper Limit on Gamma-Ray Emission by GRB 050713a from MAGIC Telescope Observations

The Astrophysical Journal, 2006

Research paper thumbnail of The Primary Proton Spectrum of Cosmic Rays Measured with Single Hadrons at Ground Level

The Astrophysical Journal, 2004

Research paper thumbnail of VHE γ‐Ray Observation of the Crab Nebula and its Pulsar with the MAGIC Telescope

The Astrophysical Journal, 2008

Research paper thumbnail of Discovery of Very High Energy Gamma Rays from 1ES 1218+30.4

The Astrophysical Journal, 2006

Research paper thumbnail of Constraints on the Steady and Pulsed Very High Energy Gamma‐Ray Emission from Observations of PSR B1951 \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usep...

The Astrophysical Journal, 2007

Research paper thumbnail of MAGIC Upper Limits on the Very High Energy Emission from Gamma‐Ray Bursts

The Astrophysical Journal, 2007

Research paper thumbnail of Upper Limit for γ‐Ray Emission above 140 GeV from the Dwarf Spheroidal Galaxy Draco

The Astrophysical Journal, 2008

Research paper thumbnail of Detection of the High-Energy Cosmic Rays from the Monogem Ring

The Astrophysical Journal, 2003

Research paper thumbnail of Very-High-Energy Gamma Rays from a Distant Quasar: How Transparent Is the Universe?

Science, 2008

The atmospheric Cherenkov gamma-ray telescope MAGIC, designed for a low-energy threshold, has det... more The atmospheric Cherenkov gamma-ray telescope MAGIC, designed for a low-energy threshold, has detected very-high-energy gamma rays from a giant flare of the distant Quasi-Stellar Radio Source (in short: radio quasar) 3C 279, at a distance of more than 5 billion light-years (a redshift of 0.536). No quasar has been observed previously in very-high-energy gamma radiation, and this is also the most distant object detected emitting gamma rays above 50 gigaelectron volts. Because high-energy gamma rays may be stopped by interacting with the diffuse background light in the universe, the observations by MAGIC imply a low amount for such light, consistent with that known from galaxy counts.

Research paper thumbnail of Probing quantum gravity using photons from a flare of the active galactic nucleus Markarian 501 observed by the MAGIC telescope

Research paper thumbnail of On the accuracy of the primary energy and nuclei determination at mountain altitudes and sea level

Nuclear Physics B - Proceedings Supplements, 1997

Research paper thumbnail of Determination of primary energy and mass in the PeV region by Bayesian unfolding techniques

Nuclear Physics B - Proceedings Supplements, 2003

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