Journal Article/Contribution to a conference proceedings/Contribution to a book PUBDB-2023-05301

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Multiwavelength characterization of two flaring blazars: insight into the emission region of intermediate-synchrotron-peaked BL Lacs

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2023
SISSA Trieste

38th International Cosmic Ray Conference, ICRC2023, NagoyaNagoya, Japan, 26 Jul 2023 - 3 Aug 20232023-07-262023-08-03 Proceedings of Science / International School for Advanced Studies (ICRC2023), 725 () [10.22323/1.444.0725]
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Abstract: The blazars B2 1811+31 and GB6 J1058+2817 were found to be in flaring state during 2020 and 2021, respectively. The high states of the sources were registered by the Fermi-LAT at energiesbelow 100 GeV, triggering observations at higher energies with the MAGIC telescopes, in theUV/X rays with the Swift satellite and with ground-based radio and optical telescopes. Theobservations in the very-high-energy (VHE, 100 GeV < E < 100 TeV) gamma-ray band led tothe first detection of both sources in this energy range. A long-term gamma-ray lightcurve wasderived using Fermi-LAT data, identifying the time intervals in which the two sources persistedin a quiet state. Archival data collected in the radio to X-ray wavelengths showed that the twosources exhibited intermediate-synchrotron-peaked BL Lac behaviors in their low states, ratherrare sources in the TeV sky. The high state of the two sources was deeply investigated thanks to thecoverage provided by multi-wavelength (MWL) observational campaigns. In this contribution,we present the results of the gamma-ray observations which are included in a MWL observationalcampaign organized on these sources during their high-states. We discuss the flare spectralproperties and temporal variability. In the high-energy gamma band, sub-daily-scale variabilityand strong spectral hardening give evidence for compact emission regions responsible for theradiative output at high energies during the flare.

Keyword(s): energy: high ; detector: optical ; gamma ray: emission ; radio wave ; synchrotron ; ultraviolet ; GeV ; blazar ; GLAST ; TeV ; gamma ray: VHE ; gamma ray: energy spectrum ; X-ray ; spectral ; variability ; satellite ; MAGIC

Classification:

Contributing Institute(s):
  1. Experiment MAGIC (Z_MAGIC)
Research Program(s):
  1. 613 - Matter and Radiation from the Universe (POF4-613) (POF4-613)
Experiment(s):
  1. Major Atmospheric Gamma Imaging Cherenkov

Appears in the scientific report 2023
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Medline ; Creative Commons Attribution-NonCommercial-NoDerivs CC BY-NC-ND 4.0 ; DOAJ ; OpenAccess ; DOAJ Seal
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 Record created 2023-08-29, last modified 2025-07-24


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