Naslov
An intermittent extreme BL Lac: MWL study of 1ES 2344+514 in an enhanced state
(An intermittent extreme BL Lac: MWL study of 1ES 2344+514 in an enhanced state)

Autori
Acciari, V. A. ; ... Babić, Ana ; ... Bošnjak, Željka ; ... Cikota, Stefan ; ... Dominis Prester, Dijana ; ... Godinović, Nikola ; ... Hrupec, Dario ; ... Manganaro, Marina ; ... Mićanović, Saša ; ... Pavletić, Lovor ; ... Puljak, Ivica ; ... Šnidarić, Iva ; ... Surić, Tihomir ; ... Terzić, Tomislav ; ... Zarić, D ; ; FACT Collaboration: Baack, D ; .... MWL Collaborators: J Acosta ; ... Šegon, M ; et al.

Kolaboracija
MAGIC Collaboration ; FACT Collaboration ; MWL Collaborators

Izvornik
Monthly notices of the Royal Astronomical Society (0035-8711) 496 (2020), 3; 3912-3928

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
BL Lacertae objects: individual: 1ES 2344+514 – galaxies: active –gamma-rays: galaxies

Sažetak
Extreme High-frequency BL~Lacs (EHBL) feature their synchrotron peak of the broadband spectral energy distribution (SED) at νs≥1017\, Hz. The BL~Lac object 1ES~2344+514 was included in the EHBL family because of its impressive shift of the synchrotron peak in 1996. During the following years, the source appeared to be in a low state without showing any extreme behaviours. In August 2016, 1ES~2344+514 was detected with the ground-based γ-ray telescope FACT during a high γ-ray state, triggering multi-wavelength (MWL) observations. We studied the MWL light curves of 1ES~2344+514 during the 2016 flaring state, using data from radio to VHE γ rays taken with OVRO, KAIT, KVA, NOT, some telescopes of the GASP-WEBT collaboration at the Teide, Crimean, and St. Petersburg observatories, \textit{; ; ; ; ; ; ; Swift}; ; ; ; ; ; ; -UVOT, \textit{; ; ; ; ; ; ; Swift}; ; ; ; ; ; ; -XRT, \textit{; ; ; ; ; ; ; Fermi}; ; ; ; ; ; ; -LAT, FACT and MAGIC. With simultaneous observations of the flare, we built the broadband SED and studied it in the framework of a leptonic and an hadronic model. The VHE γ-ray observations show a flux level of 55\% of the Crab Nebula flux above 300\, GeV, similar to the historical maximum of 1995. The combination of MAGIC and \textit{; ; ; ; ; ; ; Fermi}; ; ; ; ; ; ; -LAT spectra provides an unprecedented characterization of the inverse-Compton peak for this object during a flaring episode. The Γ index of the intrinsic spectrum in the VHE γ-ray band is 2.04±0.12stat±0.15sys. We find the source in an extreme state with a shift of the position of the synchrotron peak to frequencies above or equal to 1018\, Hz

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
Leading author: Manganaro M.

POVEZANOST RADA