Dissecting the long-term emission behaviour of the BL Lac object Mrk 421
Author
Carnerero, M. I.Raiteri, C. M.

Villata, M.
Acosta-Pulido, J. A.
Larionov, V. M.
Smith, P. S.
D'Ammando, F.
Agudo, I.
Arévalo, M. J.
Bachev, R.
Barnes, J.
Boeva, S.
Bozhilov, V.
Carosati, D.
Casadio, C.
Chen, W. P.
Damljanovic, G.
Eswaraiah, E.
Forné, E.
Gantchev, G.
Gómez, J. L.
González-Morales, P. A.
Griñón-Marín, A. B.
Grishina, T. S.
Holden, M.
Ibryamov, S.

Joner, M. D.
Jordan, B.
Jorstad, S. G.
Joshi, M.
Kopatskaya, E. N.
Koptelova, E.
Kurtanidze, O. M.
Kurtanidze, S. O.
Larionova, E. G.
Larionova, L. V.
Latev, G.
Lázaro, C.
Ligustri, R.
Lin, H. C.
Marscher, A. P.
Martínez-Lombilla, C.
McBreen, B.
Mihov, B.
Molina, S. N.
Moody, J. W.
Morozova, D. A.
Nikolashvili, M. G.
Nilsson, K.
Ovcharov, E.
Pace, C.
Panwar, N.
Pastor Yabar, A.
Pearson, R. L.
Pinna, F.
Protasio, C.
Rizzi, N.
Redondo-Lorenzo, F. J.
Rodríguez-Coira, G.
Ros, J. A.
Sadun, A. C.
Savchenko, S. S.
Semkov, E.
Slavcheva-Mihova, L.
Smith, N.
Strigachev, A.
Troitskaya, Yu. V.
Troitsky, I. S.
Vasilyev, A. A.

Vince, O.
Affiliation
Univ Arizona, Steward ObservIssue Date
2017-12Keywords
galaxies: activeBL Lacertae objects: general
BL Lacertae objects: individual: Mrk 421
galaxies: jets
Metadata
Show full item recordPublisher
OXFORD UNIV PRESSCitation
Dissecting the long-term emission behaviour of the BL Lac object Mrk 421 2017, 472 (4):3789 Monthly Notices of the Royal Astronomical SocietyRights
© 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical SocietyCollection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
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 gamma-ray fluxes is very variable. The gamma-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 similar to 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.ISSN
0035-87111365-2966
Version
Final published versionSponsors
NASA through Fermi Guest Investigator grants [NNX08AW56G, NNX09AU10G, NNX12AO93G, NNX15AU81G]; Shota Rustaveli NSF [FR/577/6-320/13]; US National Science Foundation [AST-1615796]; NASA Fermi Guest Investigator grant [NNX14AQ58G]; NASA through the Fermi Guest Investigator Program; NSF; BU; Lowell Observatory; Russian RFBR [15-02-00949]; St. Petersburg University [6.38.335.2015]; Ramon y Cajal grant of the Spanish Ministerio de Economia y Competitividad (MINECO); MINECO [AYA2010-14844, AYA2013-40825-P, AYA2016-80889-P]; Regional Government of Andalucia [P09-FQM-4784]; Scientific Research Fund of the Bulgarian Ministry of Education and Sciences [DO 02-137 (BIn-13/09), DN 08/1]; Institute of Astronomy; Rozhen National Astronomical Observatory; Bulgaria Academy of Sciences, via the bilateral joint research project 'Observations of ICRF radio-sources visible in optical domain'; Ministry of Education, Science and Technological Development of the Republic of Serbia [176011, 176004, 176021]; Shumen University [RD-08-81]Additional Links
http://academic.oup.com/mnras/article/472/4/3789/4094893/Dissecting-the-longterm-emission-behaviour-of-theae974a485f413a2113503eed53cd6c53
10.1093/mnras/stx2185