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Your search keyword '"Lidvansky, A. S."' showing total 5 results
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5 results on '"Lidvansky, A. S."'

1. Upper Limits on the Isotropic Diffuse Flux of Cosmic PeV Photons from Carpet-2 Observations.

Author

Dzhappuev, D. D., Afashokov, Yu. Z., Dzaparova, I. M., Dzhatdoev, T. A., Gorbacheva, E. A., Karpikov, I. S., Khadzhiev, M. M., Klimenko, N. F., Kudzhaev, A. U., Kurenya, A. N., Lidvansky, A. S., Mikhailova, O. I., Petkov, V. B., Podlesnyi, E. I., Pozdnukhov, N. A., Romanenko, V. S., Rubtsov, G. I., Troitsky, S. V., Unatlokov, I. B., and Vaiman, I. A.

Subjects
GAMMA rays, PHOTONS, ENERGY bands, NEUTRINOS
Abstract

Isotropic diffuse gamma-ray flux in the PeV energy band is an important tool for multimessenger tests of models of the origin of high-energy astrophysical neutrinos and for new-physics searches. So far, this flux has not yet been observed. Carpet-2 is an air-shower experiment capable of detecting astrophysical gamma rays with energies above 0.1 PeV. Here we report the upper limits on the isotropic gamma-ray flux from Carpet-2 data obtained in 1999–2011 and 2018–2022. These results, obtained with the new statistical method based on the shape of the muon-number distribution, summarize Carpet-2 observations as the upgraded installation, Carpet-3, starts its operation. [ABSTRACT FROM AUTHOR]

Published
2023
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2. Carpet—2 Search for Gamma Rays above 100 TeV in Coincidence with HAWC and IceCube Alerts.

Author

Dzhappuev, D. D., Afashokov, Yu. Z., Dzaparova, I. M., Gorbacheva, E. A., Karpikov, I. S., Khadzhiev, M. M., Klimenko, N. F., Kudzhaev, A. U., Kurenya, A. N., Lidvansky, A. S., Mikhailova, O. I., Petkov, V. B., Romanenko, V. S., Rubtsov, G. I., Troitsky, S. V., Unatlokov, I. B., Yanin, A. F., Zhezher, Ya. V., and Zhuravleva, K. V.

Subjects
GAMMA rays, NEUTRINO detectors, COINCIDENCE, COSMIC rays, CARPETS, PHOTONS, NEUTRINOS
Abstract

We report on the search of astrophysical gamma rays with energies in the 100 TeV to several PeV range arriving in directional and temporal coincidence with public alerts from HAWC (TeV gamma rays) and IceCube (neutrinos above ∼ 100TeV). The observations have been performed with the Carpet-2 air-shower detector at the Baksan Neutrino Observatory, working in the "photon-friendly" mode since 2018. Photon candidate showers are selected by their low muon content. No significant excess of the photon candidates have been observed, and upper limits on gamma-ray fluences associated with the alerts are obtained. For events with good viewing conditions, the Carpet-2 effective area for photons is of the order of the IceCube effective area for neutrinos of the same energy, so the constraints start to probe the production of neutrinos in fast flares of Galactic sources. [ABSTRACT FROM AUTHOR]

Published
2020
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3. Baksan Air Shower Array: new prospects for old facility.

Author

Lidvansky, Alexander S., Pattison, B., Itow, Y., Sako, T., and Menjo, H.

Subjects
*COSMIC ray showers, *NEUTRINOS, *PARTICLE detectors, *PARTICLE physics, *MUONS, *GAMMA ray astronomy
Abstract

The Carpet air shower array of the Baksan Neutrino Observatory is in operation for a long time, and it was modernized more than once. A short review of important results obtained with this array is given, as well as future prospects, since at the moment the new project called Carpet-3 is in progress, using the old array as its basis. The purpose of the new project is to substantially increase the muon detector area (quite soon up to 400 m2 and later up to 600 m2). This improvement will allow one to reach a very good sensitivity to diffuse cosmic photons by selecting muon-poor showers. The energy range where the new experiment will be competitive with other experiments of gamma-ray astronomy is near and below 100 TeV. [ABSTRACT FROM AUTHOR]

Published
2019
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4. Search for astrophysical PeV gamma rays from point sources with Carpet-2.

Author

Dzhappuev, D. D., Dzaparova, I. M., Gorbacheva, E. A., Karpikov, I. S., Khadzhiev, M. M., Klimenko, N. F., Kudzhaev, A. U., Kurenya, A. N., Lidvansky, A. S., Mikhailova, O. I., Petkov, V. B., Ptitsyna, K. V., Romanenko, V. S., Rubtsov, G. I., Troitsky, S. V., Yanin, A. F., Zhezher, Ya. V., and Spiering, C.

Subjects
GAMMA rays, PHOTONS, MUON detection, FLUX (Energy), NEUTRINOS
Abstract

Early results of the search for Eγ > 1 PeV cosmic photons from point sources with the data of Carpet–2, an air-shower array equipped with a 175 m2 muon detector, are presented. They include 95% CL upper limits on PeV photon fluxes from stacked directions of high-energy IceCube neutrino events and from four predefined sources, Crab, Cyg X-3, Mrk 421 and Mrk 501. An insignificant excess of events from Mrk 421 will be further monitored. Prospects of the use of the upgraded installation, Carpet–3 (410 m2 muon detector), scheduled to start data taking in 2019, for searches of Eγ > 100 TeV photons, are briefly discussed. [ABSTRACT FROM AUTHOR]

Published
2019
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5. Carpet-2 Search for PeV Gamma Rays Associated with IceCube High-Energy Neutrino Events.

Author

Dzhappuev, D. D., Dzaparova, I. M., Gorbacheva, E. A., Karpikov, I. S., Khadzhiev, M. M., Klimenko, N. F., Kudzhaev, A. U., Kurenya, A. N., Lidvansky, A. S., Mikhailova, O. I., Petkov, V. B., Ptitsyna, K. V., Romanenko, V. S., Rubtsov, G. I., Troitsky, S. V., Yanin, A. F., and Zhezher, Ya. V.

Subjects
GAMMA rays, NEUTRINOS, MUONS, NEUTRINO detectors, HADRONS, PHOTONS
Abstract

Carpet-2 is an air-shower array at Baksan Valley, Russia, equipped with a large-area (175 m2) muon detector, which makes it possible to separate primary photons from hadrons. We report the first results of the search for primary photons with energies Eγ > 1 PeV, directionally associated with IceCube high-energy neutrino events, in the data obtained in 3080 days of Carpet-2 live time. [ABSTRACT FROM AUTHOR]

Published
2019
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