A5015743451- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Radio Astronomy Observations and Technology
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- Radioactivity and Radon Measurements
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Particle Accelerators and Free-Electron Lasers
- Particle physics theoretical and experimental studies
- Radiation Detection and Scintillator Technologies
Institute for Nuclear Research
2012-2019
Lomonosov Moscow State University
2010-2016
University of Geneva
2016
We review basic constraints on the acceleration of ultra-high-energy (UHE) cosmic rays (CRs) in astrophysical sources, namely geometrical (Hillas) criterion and restrictions from radiation losses different regimes.Using latest available data, we redraw Hillas plot figure out potential UHECR accelerators.For central engines active galactic nuclei, constrain maximal energy for a given black-hole mass.Among galaxies, only most powerful ones, radio galaxies blazars, are able to accelerate...
High-energy emission from blazars is produced by electrons which are either accelerated directly (the assumption of leptonic models blazar activity) or in interactions protons with matter and radiation fields hadronic models). The predict that gamma-ray accompanied neutrino comparable energy flux but a different spectrum. We derive constraints on the activity imposed non-detection population emitting blazars. stack muon 749 situated declination strip above -5 degrees. Non-detection stacked...
We discuss the physics case for and concept of a medium-scale axion helioscope with sensitivities in axion-photon coupling few times better than CERN Axion Solar Telescope (CAST). Search an axion-like particle these couplings is motivated by several persistent astrophysical anomalies. present early conceptual design, existing infrastructure, projected sensitivity timeline such (Troitsk Experiment, TASTE) to be constructed Institute Nuclear Research, Troitsk, Russia. The proposed instrument...
We consider particle acceleration in vacuum gaps magnetospheres of black holes powered through Blandford-Znajek mechanism and embedded into radiatively-inefficient accretion flow (RIAF) environment. In such situation the gap height is limited by onset gamma-gamma pair production on infrared photons originating from RIAF. numerically calculate propagation charged particles taking account detailed structure electric magnetic field entire hole magnetosphere, radiative energy losses interactions...
Физические условия в потенциальных ускорителях космических лучей сверхвысоких энергий: обновлённая диаграмма Хилласа и ограничения из потерь на излучение, Птицына К.В., Троицкий С.В.
We construct and discuss a toy model of the population numerous non-identical extragalactic sources ultra-high-energy cosmic rays. In model, cosmic-ray particles are accelerated in magnetospheres supermassive black holes galactic nuclei, key parameter acceleration being black-hole mass. use astrophysical data on redshift-dependent mass function to describe these accelerators, from weak powerful, confront with data.
Early results of the search for E_\gamma>1 PeV cosmic photons from point sources with data Carpet-2, an air-shower array equipped a 175 m^2 muon detector, are presented. They include 95% CL upper limits on photon fluxes stacked directions high-energy IceCube neutrino events and four predefined sources, Crab, Cyg X-3, Mrk 421 501. An insignificant excess will be further monitored. Prospects use upgraded installation, Carpet-3 (410 detector), scheduled to start taking in 2019, searches...
An experiment for measuring the flux of gamma rays cosmic origin with energy above 100 TeV is currently being prepared at Baksan Neutrino Observatory (the Carpet-3 experiment). The performance will be accomplished after radical modernization existing array by substantially increasing areas both muon detector and ground level shower array. In this work some results calculations efficiency showers from primary are presented different configurations It demonstrated that area up to 615 m2...
Abstract An experiment for measuring the flux of cosmic gamma rays with energy above 100 TeV is currently being prepared at Baksan Neutrino Observatory Institute Nuclear Research, Russian Academy Sciences. At present plastic scintillation counters a total continuous area 410 m 2 are installed in muon detector (MD) underground tunnels, and they totally equipped electronics. Six modules shower detectors have been already placed on surface MD absorber. In each them 9 standard an 1 each. These...
A toy model of the population numerous non-identical extragalactic sources ultra-high-energy cosmic rays is presented. In model, acceleration cosmic-ray particles direct (not diffusive) and takes place in magnetospheres supermassive black holes galactic nuclei, key parameter being black-hole mass. We use astrophysical data to describe these accelerators confront with gamma-ray data.