期刊
ASTRONOMY & ASTROPHYSICS
卷 655, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/202141886
关键词
BL Lacertae objects: individual: Mrk 501; radiation mechanisms: non-thermal; radiative transfer; galaxies: active
资金
- ETH Zurich [ETH-10.08-2, ETH-27.12-1]
- Deutsche Forschungsgemeinschaft (DFG) [SFB 876]
- California Insitute of Technology
- Max Planck Institute for Radio Astronomy
- NASA [NNX08AW31G, NNX11A043G, NNX14AQ89G]
- NSF [AST-0808050, AST-1109911]
The study found a sub-day lag between variability in TeV and X-ray emissions, simultaneous variations in TeV and X-ray with almost zero lag are consistent with synchrotron self-Compton emission, and the characteristic time interval between TeV flares of 5-25 days suggests they may be driven by Lense-Thirring precession.
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.
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