Dissecting the long-term emission behaviour of the BL Lac object Mrk 421

M. I. Carnerero, C. M. Raiteri, M. Villata, J. A. Acosta-Pulido, V. M. Larionov, P. S. Smith, F. D'Ammando, I. Agudo, M. J. Arévalo, R. Bachev, J. Barnes, S. Boeva, V. Bozhilov, D. Carosati, C. Casadio, W. P. Chen, G. Damljanovic, E. Eswaraiah, E. Forné, G. GantchevJ. L. Gómez, P. A. González-Morales, A. B. Griñón-Marín, T. S. Grishina, M. Holden, S. Ibryamov, M. D. Joner, B. Jordan, S. G. Jorstad, M. Joshi, E. N. Kopatskaya, E. Koptelova, O. M. Kurtanidze, S. O. Kurtanidze, E. G. Larionova, L. V. Larionova, G. Latev, C. Lázaro, R. Ligustri, H. C. Lin, A. P. Marscher, C. Martínez-Lombilla, B. McBreen, B. Mihov, S. N. Molina, J. W. Moody, D. A. Morozova, M. G. Nikolashvili, K. Nilsson, E. Ovcharov, C. Pace, N. Panwar, A. Pastor Yabar, R. L. Pearson, F. Pinna, C. Protasio, N. Rizzi, F. J. Redondo-Lorenzo, G. Rodríguez-Coira, J. A. Ros, A. C. Sadun, S. S. Savchenko, E. Semkov, L. Slavcheva-Mihova, N. Smith, A. Strigachev, Yu V. Troitskaya, I. S. Troitsky, A. A. Vasilyev, O. Vince

研究成果: 雜誌貢獻期刊論文同行評審

28 引文 斯高帕斯(Scopus)


We report on long-term multiwavelength monitoring of blazar Mrk 421 by the GLAST-AGILE Support Program of the Whole Earth Blazar Telescope (GASP-WEBT) collaboration and Steward Observatory, and by the Swift and Fermi satellites. We study the source behaviour in the period 2007-2015, characterized by several extreme flares. The ratio between the optical, X-ray and γ-ray fluxes is very variable. The γ-ray flux variations show a fair correlation with the optical ones starting from 2012. We analyse spectropolarimetric data and find wavelength-dependence of the polarization degree (P), which is compatible with the presence of the host galaxy, and no wavelength dependence of the electric vector polarization angle (EVPA). Optical polarimetry shows a lack of simple correlation between P and flux and wide rotations of the EVPA. We build broad-band spectral energy distributions with simultaneous near-infrared and optical data from the GASP-WEBT and ultraviolet and X-ray data from the Swift satellite. They show strong variability in both flux and X-ray spectral shape and suggest a shift of the synchrotron peak up to a factor of ~50 in frequency. The interpretation of the flux and spectral variability is compatible with jet models including at least two emitting regions that can change their orientation with respect to the line of sight.

頁(從 - 到)3789-3804
期刊Monthly Notices of the Royal Astronomical Society
出版狀態已出版 - 1 12月 2017


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