Heidelberg 2022 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 11: Astroparticles: From the source to the detector (joint session EP/T)
EP 11.2: Vortrag
Donnerstag, 24. März 2022, 16:30–16:45, EP-H1
Multi-messenger characterization of Mrk501 during historically low X-ray and gamma-ray activity — •Lea Heckmann1, David Paneque1, Sargis Gasparyan2, Matteo Cerruti3, Narek Sahakyan2, and Axel Arbet-Engels1 for the Multi-wavelength collaborators and the MAGIC and Fermi-LAT collaboration — 1Max-Planck-Institut für Physik, D-80805 München, Germany — 2ICRANet-Armenia, Marshall Baghramian Avenue 24a, Yerevan 0019, Armenia — 3Institut de Ciències del Cosmos (ICCUB), Universitat de Barcelona (IEEC-UB), Martí i Franquès 1, 8 E08028 Barcelona, Spain
Blazars are the most numerous very-high-energy (>0.2 TeV, VHE) gamma-ray emitters, due to their continuous and very luminous emission; but they are far from being understood.
In this contribution we describe the multi-wavelength behavior of Mrk501, one of our closest and therefore brightest blazars, from 2017 to 2020. Alongside the dense monitoring campaign over this four years, three long observations with NuSTAR were conducted displaying various low-activity flux levels for the hard X-ray emission. This very comprehensive data set reveals a historically low X-ray and VHE gamma-ray emission period lasting two years. Using the low-activity broadband spectral energy distribution (SED) and data published by IceCube, we investigate the nature of the low state. Additionally, we try to explain the evolution of the broadband SED data during the low state to evaluate its potential of being the baseline emission of Mrk501 that is usually outshone by more dominant and variable components.