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  Observations of the Crab Nebula and Pulsar with the Large-Sized Telescope Prototype of the Cherenkov Telescope Array

Project, C.-L., Abe, H., Abe, K., Abe, S., Aguasca-Cabot, A., Agudo, I., et al. (2023). Observations of the Crab Nebula and Pulsar with the Large-Sized Telescope Prototype of the Cherenkov Telescope Array. Astrophysical Journal, 956, 80. doi:10.3847/1538-4357/ace89d.

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Project, CTA-LST1, Autor
Abe, H.1, Autor
Abe, K.1, Autor
Abe, S.1, Autor
Aguasca-Cabot, A.1, Autor
Agudo, I.1, Autor
Alvarez Crespo, N.1, Autor
Antonelli, L.A.1, Autor
Aramo, C.1, Autor
Arbet-Engels, A.1, Autor
Arcaro, C.1, Autor
Artero, M.1, Autor
Asano, K.1, Autor
Aubert, P.1, Autor
Baktash, A.1, Autor
Bamba, A.1, Autor
Baquero Larriva, A.1, Autor
Baroncelli, L.1, Autor
Barres de Almeida, U.1, Autor
Barrio, J.A.1, Autor
Batkovic, I.1, AutorBaxter, J.1, AutorBecerra González, J.1, AutorBernardini, E.1, AutorBernardos, M.I.1, AutorBernete Medrano, J.1, AutorBerti, A.1, AutorBhattacharjee, P.1, AutorBiederbeck, N.1, AutorBigongiari, C.1, AutorBissaldi, E.1, AutorBlanch, O.1, AutorBonnoli, G.1, AutorBordas, P.1, AutorBorghese, A.1, AutorBulgarelli, A.1, AutorBurelli, I.1, AutorBuscemi, M.1, AutorCardillo, M.1, AutorCaroff, S.1, AutorCarosi, A.1, AutorCassol, F.1, AutorCauz, D.1, AutorCeribella, G.1, AutorChai, Y.1, AutorCheng, K.1, AutorChiavassa, A.1, AutorChikawa, M.1, AutorChytka, L.1, AutorCifuentes, A.1, AutorContreras, J.L.1, AutorCortina, J.1, AutorCostantini, H.1, AutorD'Amico, G.1, AutorDalchenko, M.1, AutorDe Angelis, A.1, Autorde Bony de Lavergne, M.1, AutorDe Lotto, B.1, Autorde Menezes, R.1, AutorDeleglise, G.1, AutorDelgado, C.1, AutorDelgado Mengual, J.1, Autordella Volpe, D.1, AutorDellaiera, M.1, AutorDepaoli, D.1, AutorDi Piano, A.1, AutorDi Pierro, F.1, AutorDi Tria, R.1, AutorDi 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1Max Planck Institute for Physics, Max Planck Society and Cooperation Partners, ou_2253650              

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Schlagwörter: CTA
 Zusammenfassung: CTA (Cherenkov Telescope Array) is the next generation ground-based observatory for gamma-ray astronomy at very-high energies. The Large-Sized Telescope prototype (LST-1) is located at the Northern site of CTA, on the Canary Island of La Palma. LSTs are designed to provide optimal performance in the lowest part of the energy range covered by CTA, down to $\simeq 20$ GeV. LST-1 started performing astronomical observations in November 2019, during its commissioning phase, and it has been taking data since then. We present the first LST-1 observations of the Crab Nebula, the standard candle of very-high energy gamma-ray astronomy, and use them, together with simulations, to assess the basic performance parameters of the telescope. The data sample consists of around 36 hours of observations at low zenith angles collected between November 2020 and March 2022. LST-1 has reached the expected performance during its commissioning period - only a minor adjustment of the preexisting simulations was needed to match the telescope behavior. The energy threshold at trigger level is estimated to be around 20 GeV, rising to $\simeq 30$ GeV after data analysis. Performance parameters depend strongly on energy, and on the strength of the gamma-ray selection cuts in the analysis: angular resolution ranges from 0.12 to 0.40 degrees, and energy resolution from 15 to 50%. Flux sensitivity is around 1.1% of the Crab Nebula flux above 250 GeV for a 50-h observation (12% for 30 minutes). The spectral energy distribution (in the 0.03 - 30 TeV range) and the light curve obtained for the Crab Nebula agree with previous measurements, considering statistical and systematic uncertainties. A clear periodic signal is also detected from the pulsar at the center of the Nebula.

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 Datum: 2023
 Publikationsstatus: Erschienen
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Titel: Astrophysical Journal
  Kurztitel : Astrophys.J.
Genre der Quelle: Zeitschrift
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Seiten: - Band / Heft: 956 Artikelnummer: - Start- / Endseite: 80 Identifikator: -