Search Results - "Vovk, Ievgen"

Evidence for Strong Extragalactic Magnetic Fields from Fermi Observations of TeV Blazars by Neronov, Andrii, Vovk, Ievgen

“…Magnetic fields in galaxies are produced via the amplification of seed magnetic fields of unknown nature. The seed fields, which might exist in their initial…”
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Central engine of a gamma-ray blazar resolved through the magnifying glass of gravitational microlensing by Neronov, Andrii, Vovk, Ievgen, Malyshev, Denys

“…A foreground galaxy cluster is magnifying a more distant blazar by gravitationally bending the emitted radiation. Using such a lens, it is possible to resolve…”
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Extending the observation limits of Imaging Air Cherenkov Telescopes toward horizon by Mirzoyan, Razmik, Vovk, Ievgen, Peresano, Michele, Temnikov, Petar, Zaric, Darko, Godinovic, Nikola, van Scherpenberg, Juliane, Besenrieder, Juergen, Teshima, Masahiro

“…Usually the Imaging Atmospheric Cherenkov Telescopes, used for the ground-based gamma-ray astronomy in the very high energy range 50 GeV–50 TeV, perform air…”
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Broad Band Observations of Gravitationally Lensed Blazar during a Gamma-Ray Outburst by Sitarek, Julian, Gonzalez, Josefa Becerra, Buson, Sara, Prester, Dijana Dominis, Manganaro, Marina, Mazin, Daniel, Nilsson, Kari, Nievas, Mireia, Stamerra, Antonio, Tavecchio, Fabrizio

“…QSO B0218+357 is a gravitationally lensed blazar located at a cosmological redshift of 0.944. In July 2014 a GeV flare was observed by Fermi-LAT, triggering…”
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Search of the pair echo signatures in the high-energy light curve of GRB190114C by Vovk, Ievgen

“…Physical Review D, vol. 107, issue 4, page 043020 (2023) A model of the time delayed electromagnetic cascade "echo" is applied to the bright gamma-ray burst…”
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Probing intergalactic intergalactic magnetic fields with LOFAR LoTSS DR2 data by Bondarenko, Kyrylo, Boyarsky, Alexey, Sokolenko, Anastasia, Vovk, Ievgen

“…We use Faraday rotation measurements from the latest catalog LoTSS DR2 from LOFAR to probe intergalactic magnetic fields. To identify the extragalactic…”
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Microlensing constraint on the size of the gamma-ray emission region in blazar B0218+357 by Vovk, Ievgen, Neronov, Andrii

“…Context. Observations of the effect of microlensing in gravitationally lensed quasars could potentially be used to study the structure of the source on…”
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CTA sensitivity for probing cosmology and fundamental physics with gamma rays by Vovk, Ievgen, Biteau, Jonathan, Martinez-Huerta, Humberto, Meyer, Manuel, Pita, Santiago

“…The Cherenkov Telescopic Array (CTA), the next-generation ground-based gamma-ray observatory, will have unprecedented sensitivity, providing answers to open…”
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Variability of gamma-ray emission from blazars on the black hole timescales by Vovk, Ievgen, Neronov, Andrii

“…ApJ, 767, 103, 2013 We investigate the variability properties of blazars in the GeV band using the data of the Fermi/LAT telescope. We find that blazars…”
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MAGIC observations of Dragonfly Nebula at TeV Energies using the Very Large Zenith Angle Technique by Zarić, Darko, Mirzoyan, Razmik, Vovk, Ievgen, Temnikov, Petar, Peresano, Michele, Godinović, Nikola, van Scherpenberg, Juliane, Besenrieder, Jürgen

“…Proceedings of the 36th International Cosmic Ray Conference (ICRC2019), PoS(ICRC2019)827 One of the brightest regions of diffuse gamma-ray emission in the…”
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Searching for Variability of the Crab Nebula Flux at TeV Energies using MAGIC Very Large Zenith Angle Observations by van Scherpenberg, Juliane, Mirzoyan, Razmik, Vovk, Ievgen, Peresano, Michele, Zarić, Darko, Temnikov, Petar, Godinović, Nikola, Besenrieder, Jürgen

“…The Crab nebula was once considered to be a stable source until strong flares, up to 30 times increase in flux, were observed in the MeV and GeV energy range…”
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The Crab Nebula Spectrum at ~100 TeV Measured with MAGIC under Very Large Zenith Angles by Peresano, Michele, Mirzoyan, Razmik, Vovk, Ievgen, Temnikov, Petar, Zarić, Darko, Godinović, Nikola, van Scherpenberg, Juliane, Besenrieder, Jüergen

“…PoS(ICRC2019)759 The Crab Nebula was discovered as the first very-high-energy gamma-ray source by the Whipple Observatory in 1989. Thirty years after its…”
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Fast variability of gamma-ray emission from supermassive black hole binary OJ 287 by Neronov, Andrii, Vovk, Ievgen

“…We report the discovery of fast variability of gamma-ray flares from blazar OJ 287. This blazar is known to be powered by binary system of supermassive black…”
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Evidence for strong extragalactic magnetic fields from Fermi observations of TeV blazars by Neronov, Andrii, Vovk, Ievgen

“…Science 328:73-75,2010 Magnetic fields in galaxies are produced via the amplification of seed magnetic fields of unknown nature. The seed fields, which might…”
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Extending the observation limits of Imaging Air Cherenkov Telescopes toward horizon by Mirzoyan, Razmik, Vovk, Ievgen, Peresano, Michele, Temnikov, Petar, Zaric, Darko, Godinovic, Nikola, van Scherpenberg, Juliane, Besenrieder, Juergen, Teshima, Masahiro

“…Usually the Imaging Atmospheric Cherenkov Telescopes, used for the ground-based gamma-ray astronomy in the very high energy range 50 GeV - 50 TeV, perform air…”
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Studying cosmological $\gamma$-ray propagation with the Cherenkov Telescope Array by Gaté, Florian, Batista, Rafael Alves, Biteau, Jonathan, Lefaucheur, Julien, Mangano, Salvatore, Meyer, Manuel, Piel, Quentin, Pita, Santiago, Sanchez, David, Vovk, Ievgen

“…The measurement of $\gamma$-rays originating from active galactic nuclei offers the unique opportunity to study the propagation of very-high-energy photons…”
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White paper on EUSO-SPB2 by AdamsJr, James H, Anchordoqui, Luis A, Apple, Jeffrey A, Bertaina, Mario E, Christl, Mark J, Fenu, Francesco, Kuznetsov, Evgeny, Neronov, Andrii, Olinto, Angela V, Parizot, Etienne, Paul, Thomas C, Prevot, Guillaume, Reardon, Patrick, Vovk, Ievgen, Wiencke, Lawrence, Young, Roy M

“…EUSO-SPB2 is a second generation Extreme Universe Space Observatory (EUSO) on a Super-Pressure Balloon (SPB). This document describes the physics capabilities,…”
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Fermi/LAT observations of 1ES 0229+200: implications for extragalactic magnetic fields and background light by Vovk, Ievgen, Taylor, Andrew M, Semikoz, Dmitri, Neronov, Andrii

“…The Astrophysical Journal Letters, vol. 747, L14 (2012) We report the observation in the GeV band of the blazar 1ES 0229+200, which over recent years has…”
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Detection of very-high-energy gamma rays from the most distant and gravitationally lensed blazar QSO B0218+357 using the MAGIC telescope system by Sitarek, Julian, González, J. Becerra, Prester, Dijana Dominis, Lindfors, Elina, Manganaro, Marina, Mazin, Daniel, Rosillo, Miguel Nievas, Stamerra, Antonio, Vovk, Ievgen, Buson, Sara

“…QSO B0218+357 is a blazar located at a cosmological redshift of z=0.944. It is gravitationally lensed by a spiral galaxy at a redshift of z=0.68. The blazar…”
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The blazar TXS 0506+056 associated with a high-energy neutrino: insights into extragalactic jets and cosmic ray acceleration by Ansoldi, S., Antonelli, L. A., Arcaro, Cornelia, Baack, Dominik, Babić, Ana, Bangale, Priyadarshini, Barres De Almeida, Ulisses, Berti, Alessio, Bonnoli, Giacomo, Carosi, Alessandro, Ceribella, Giovanni, Chatterjee, Anshu, Colak, Sidika Merve, Colin, Pierre, Colombo, Eduardo, Contreras, Jose Luis, Covino, Stefano, Cumani, Paolo, Da Vela, Paolo, De Angelis, Alessandro, De Lotto, Barbara, Delfino, Manuel, Delgado, Jordi, Dominis Prester, Dijana, Dorner, Daniela, Doro, Michele, Einecke, Sabrina, Elsaesser, Dominik, Fallah Ramazani, Vandad, Fernández-Barral, Alba, Foffano, Luca, Pfrang, Konstantin, Fonseca, Maria Victoria, Font, Lluis, Fruck, Christian, Gallozzi, Stefano, Garczarczyk, Markus, Gaug, Markus, Godinović, Nikola, Gora, Dariusz, Hadasch, Daniela, Hayashida, Masaaki, Herrera, Javier, Hose, Juergen, Hrupec, Dario, Inoue, Susumu, Ishio, Kazuma, Konno, Yusuke, Kubo, Hidetoshi, Kushida, Junko, Lelas, Damir, Lindfors, Elina, Lombardi, Saverio, Longo, Francesco, López, Marcos, Maggio, Camilla, Majumdar, Pratik, Makariev, Martin, Maneva, Galina, Manganaro, Marina, Mariotti, Mosé, Martínez, Manel, Masuda, Shu, Mazin, Daniel, Moreno, Victoria, Nievas Rosillo, Mireia, Ninci, Daniele, Noda, Koji, Paiano, Simona, Paneque, David, Paoletti, Riccardo, Paredes, Josep M., Pedaletti, Giovanna, Peresano, Michele, Persic, Massimo, Prada Moroni, Pier Giorgio, Rodriguez Garcia, Jezabel, Reichardt, Ignasi, Rhode, Wolfgang, Ribó, Marc, Righi, Chiara, Rugliancich, Andrea, Satalecka, Konstancja, Schweizer, Thomas, Snidarić, Iva, Sobczynska, Dorota, Strzys, Marcel, Surić, Tihomir, Tavecchio, Fabrizio, Teshima, Masahiro, Torres-Albà, Nuria, Treves, Aldo, Tsujimoto, Shimpei, Vanzo, Gaia, Vazquez Acosta, Monica, Vovk, Ievgen, Ward, John E., Will, Martin, Zarić, Darko, Cerruti, Matteo

“…A neutrino with energy ∼290 TeV, IceCube-170922A, was detected in coincidence with the BL Lac object TXS 0506+056 during enhanced gamma-ray activity, with…”
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