New Hard-TeV Extreme Blazars Detected with the MAGIC Telescopes*
- Authors: Acciari, VA; Ansoldi, S; Antonelli, LA; Engels, AA; Asano, K; Baack, D; Babic, A; Banerjee, B; de Almeida, UB; Barrio, JA; González, JB; Bednarek, W; Bellizzi, L; Bernardini, E; Berti, A; Besenrieder, J; Bhattacharyya, W; Bigongiari, C; Biland, A; Blanch, O; Bonnoli, G; Bosnjak, Z; Busetto, G; Carosi, R; Ceribella, G; Cerruti, M; Chai, Y; Chilingaryan, A; Cikota, S; Colak, SM; Colin, U; Colombo, E; Contreras, JL; Cortina, J; Covino, S; D'Elia, V; Da Vela, P; Dazzi, F; De Angelis, A; De Lotto, B; Delfino, M; Delgado, J; Depaoli, D; Di Pierro, F; Di Venere, L; Espiñeira, ED; Prester, DD; Donini, A; Dorner, D; Doro, M; Elsaesser, D; Ramazani, VF; Fattorini, A; Ferrara, G; Fidalgo, D; Foffano, L; Fonseca, MV; Font, L; Fruck, C; Fukami, S; López, RJG; Garczarczyk, M; Gasparyan, S; Gaug, M; Giglietto, N; Giordano, F; Godinovic, N; Green, D; Guberman, D; Hadasch, D; Hahn, A; Herrera, J; Hoang, J; Hrupec, D; Hütten, M; Inada, T; Inoue, S; Ishio, K; Iwamura, Y; Jouvin, L; Kerszberg, D; Kubo, H; Kushida, J; Lamastra, A; Lelas, D; Leone, F; Lindfors, E; Lombardi, S; Longo, F; López, M; López-Coto, R; López-Oramas, A; Loporchio, S; Fraga, BMD; Maggio, C; Majumdar, P; Makariev, M; Mallamaci, M; Maneva, G; Manganaro, M; Mannheim, K; Maraschi, L; Mariotti, M; MartÃnez, M; Mazin, D; Micanovic, S; Miceli, D; Minev, M; Miranda, JM; Mirzoyan, R; Molina, E; Moralejo, A; Morcuende, D; Moreno, V; Moretti, E; Munar-Adrover, P; Neustroev, V; Nigro, C; Nilsson, K; Ninci, D; Nishijima, K; Noda, K; Nogués, L; Nozaki, S; Paiano, S; Palatiello, M; Paneque, D; Paoletti, R; Paredes, JM; Peñil, P; Peresano, M; Persic, M; Moroni, PGP; Prandini, E; Puljak, I; Rhode, W; Ribó, M; Rico, J; Righi, C; Rugliancich, A; Saha, L; Sahakyan, N; Saito, T; Sakurai, S; Satalecka, K; Schmidt, K; Schweizer, T; Sitarek, J; Snidaric, I; Sobczynska, D; Somero, A; Stamerra, A; Strom, D; Strzys, M; Suda, Y; Suric, T; Takahashi, M; Tavecchio, F; Temnikov, P; Terzic, T; Teshima, M; Torres-Albà , N; Tosti, L; Vagelli, V; van Scherpenberg, J; Vanzo, G; Acosta, MV; Vigorito, CF; Vitale, V; Vovk, I; Will, M; Zaric, D; Arcaro, C; Carosi, A; D'Ammando, F; Tombesi, F; Lohfink, A
- Publication year: 2020
- Type: Articolo in rivista
- Key words: Blazars; Active galactic nuclei; Relativistic jets; BL Lacertae objects; X-ray active galactic nuclei; Catalogs; Non-thermal radiation sources; Gamma-ray sources
- OA Link: http://hdl.handle.net/10447/639219
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.