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Acciari, V. A.; Ansoldi, S.; Babić, A.; de Almeida, U. Barres; Barrio, J. A.; Bellizzi, L.; Besenrieder, J.; Bhattacharyya, W.; Bigongiari, C.; Biland, A.; Blanch, O.; Bonnoli, G.; Busetto, G.; Carosi, R.; Chai, Y.; Cikota, S.; Colin, U.; Colombo, E.; Cortina, J.; Covino, S.; D’Elia, V.; Vela, P. Da; Dazzi, F.; Angelis, A. De; Lotto, B. De; Delfino, M.; Delgado, J.; Pierro, F. Di; Donini, A.; Fidalgo, D.; Fonseca, M. V.; López, R. J. García; Gasparyan, S.; Gaug, M.; Giglietto, N.; Giordano, F.; Godinović, N.; Guberman, D.; Hahn, A.; Inada, T.; Jouvin, L.; Kerszberg, D.; Kubo, H.; Lamastra, A.; Lelas, D.; Leone, F.; Lindfors, E.; Lombardi, S.; López, M.; Loporchio, S.; Maggio, C.; Mallamaci, M.; Maneva, G.; Mannheim, K.; Maraschi, L.; Mazin, D.; Mićanović, S.; Miceli, D.; Minev, M.; Mirzoyan, R.; Molina, E.; Morcuende, D.; Moreno, V.; Munar-Adrover, P.; Neustroev, V.; Nigro, C.; Noda, K.; Nogués, L.; Nozaki, S.; Paiano, S.; Palatiello, M.; Persic, M.; Prandini, E.; Puljak, I.; Ribó, M.; Rico, J.; Righi, C.; Rugliancich, A.; Sahakyan, N.; Saito, T.; Sakurai, S.; Satalecka, K.; Schmidt, K.; Schweizer, T.; Sitarek, J.; Šnidarić, I.; Sobczynska, D.; Stamerra, A.; Suda, Y.; Surić, T.; Takahashi, M.; Tavecchio, F.; Terzić, T.; Vagelli, V.; Vigorito, C. F.; Vovk, I.; Arcaro, C.; D’Ammando, F.; Tombesi, F.; Lohfink, A.
The Astrophysical journal. Supplement series, 03/2020, Letnik: 247, Številka: 1Journal Article
Abstract Extreme high-frequency-peaked BL Lac objects (EHBLs) are blazars that exhibit extremely energetic synchrotron emission. They also feature nonthermal gamma-ray emission whose peak lies in the very high-energy (VHE, E > 100 GeV) range, and in some sources exceeds 1 TeV: this is the case for hard-TeV EHBLs such as 1ES 0229+200. With the aim of increasing the EHBL population, 10 targets were observed with the MAGIC telescopes from 2010 to 2017, for a total of 265 hr of good-quality data. The data were complemented by coordinated Swift observations. The X-ray data analysis confirms that all but two sources are EHBLs. The sources show only a modest variability and a harder-when-brighter behavior, typical for this class of objects. At VHE gamma-rays, three new sources were detected and a hint of a signal was found for another new source. In each case, the intrinsic spectrum is compatible with the hypothesis of a hard-TeV nature of these EHBLs. The broadband spectral energy distributions (SEDs) of all sources are built and modeled in the framework of a single-zone, purely leptonic model. The VHE gamma-ray-detected sources were also interpreted with a spine–layer model and a proton synchrotron model. The three models provide a good description of the SEDs. However, the resulting parameters differ substantially in the three scenarios, in particular the magnetization parameter. This work presents the first mini catalog of VHE gamma-ray and multiwavelength observations of EHBLs.
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in: SICRIS
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