Volume 655, November 2021
|Number of page(s)||10|
|Published online||25 November 2021|
Long-term multi-band photometric monitoring of Mrk 501⋆
Institute for Particle Physics and Astrophysics, ETH Zurich, Otto Stern Weg 5, 8093 Zurich, Switzerland
2 Fakultät Physik, Technische Universität Dortmund, Otto Hahn Str. 4a, 44227 Dortmund, Germany
3 Department of Astronomy, University of Geneva, Chemin Pegasi 51, 1290 Versoix, Switzerland
e-mail: firstname.lastname@example.org, email@example.com
4 Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Emil Fischer Str. 31, 97074 Würzburg, Germany
5 Physikalisches Institut III A, RWTH Aachen University, Otto Blumenthal Str., 52074 Aachen, Germany
Accepted: 23 August 2021
Aims. Radio-to-TeV observations of the bright nearby (z = 0.034) blazar Markarian 501 (Mrk 501), performed from December 2012 to April 2018, are used to study the emission mechanisms in its relativistic jet.
Methods. We examined the multi-wavelength variability and the correlations of the light curves obtained by eight different instruments, including the First G-APD Cherenkov Telescope (FACT), observing Mrk 501 in very high-energy (VHE) gamma-rays at TeV energies. We identified individual TeV and X-ray flares and found a sub-day lag between variability in these two bands.
Results. Simultaneous TeV and X-ray variations with almost zero lag are consistent with synchrotron self-Compton (SSC) emission, where TeV photons are produced through inverse Compton scattering. The characteristic time interval of 5−25 days between TeV flares is consistent with them being driven by Lense-Thirring precession.
Key words: BL Lacertae objects: individual: Mrk 501 / radiation mechanisms: non-thermal / radiative transfer / galaxies: active
Light curves of Fig. 1 are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (126.96.36.199) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/655/A93
© ESO 2021
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