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Investigation of the correlation patterns and the Compton dominance variability of Mrk 421 in 2017

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dc.contributor.author Acciari V.A.
dc.contributor.author Ansoldi S.
dc.contributor.author Antonelli L.A.
dc.contributor.author Arbet Engels A.
dc.contributor.author Artero M.
dc.contributor.author Asano K.
dc.contributor.author Babić A.
dc.contributor.author Baquero A.
dc.contributor.author Barres De Almeida U.
dc.contributor.author Barrio J.A.
dc.contributor.author Batković I.
dc.contributor.author Becerra González J.
dc.contributor.author Bednarek W.
dc.contributor.author Bellizzi L.
dc.contributor.author Bernardini E.
dc.contributor.author Bernardos M.
dc.contributor.author Berti A.
dc.contributor.author Besenrieder J.
dc.contributor.author Bhattacharyya W.
dc.contributor.author Bigongiari C.
dc.contributor.author Blanch O.
dc.contributor.author Bošnjak A.
dc.contributor.author Busetto G.
dc.contributor.author Carosi R.
dc.contributor.author Ceribella G.
dc.contributor.author Cerruti M.
dc.contributor.author Chai Y.
dc.contributor.author Chilingarian A.
dc.contributor.author Cikota S.
dc.contributor.author Colak S.M.
dc.contributor.author Colombo E.
dc.contributor.author Contreras J.L.
dc.contributor.author Cortina J.
dc.contributor.author Covino S.
dc.contributor.author D'Amico G.
dc.contributor.author D'Elia V.
dc.contributor.author Da Vela P.
dc.contributor.author Dazzi F.
dc.contributor.author De Angelis A.
dc.contributor.author De Lotto B.
dc.contributor.author Delfino M.
dc.contributor.author Delgado J.
dc.contributor.author Delgado Mendez C.
dc.contributor.author Depaoli D.
dc.contributor.author Di Pierro F.
dc.contributor.author Di Venere L.
dc.contributor.author Do Souto Espiñeira E.
dc.contributor.author Dominis Prester D.
dc.contributor.author Donini A.
dc.contributor.author Doro M.
dc.contributor.author Fallah Ramazani V.
dc.contributor.author Fattorini A.
dc.contributor.author Ferrara G.
dc.contributor.author Fonseca M.V.
dc.contributor.author Font L.
dc.contributor.author Fruck C.
dc.contributor.author Fukami S.
dc.contributor.author García López R.J.
dc.contributor.author Garczarczyk M.
dc.contributor.author Gasparyan S.
dc.contributor.author Gaug M.
dc.contributor.author Giglietto N.
dc.contributor.author Giordano F.
dc.contributor.author Gliwny P.
dc.contributor.author Godinović N.
dc.contributor.author Green J.G.
dc.contributor.author Green D.
dc.contributor.author Hadasch D.
dc.contributor.author Hahn A.
dc.contributor.author Heckmann L.
dc.contributor.author Herrera J.
dc.contributor.author Hoang J.
dc.contributor.author Hrupec D.
dc.contributor.author Hütten M.
dc.contributor.author Inada T.
dc.contributor.author Inoue S.
dc.contributor.author Ishio K.
dc.contributor.author Iwamura Y.
dc.contributor.author Jiménez I.
dc.contributor.author Jormanainen J.
dc.contributor.author Jouvin L.
dc.contributor.author Kajiwara Y.
dc.contributor.author Karjalainen M.
dc.contributor.author Kerszberg D.
dc.contributor.author Kobayashi Y.
dc.contributor.author Kubo H.
dc.contributor.author Kushida J.
dc.contributor.author Lamastra A.
dc.contributor.author Lelas D.
dc.contributor.author Leone F.
dc.contributor.author Lindfors E.
dc.contributor.author Lombardi S.
dc.contributor.author Longo F.
dc.contributor.author López-Coto R.
dc.contributor.author López-Moya M.
dc.contributor.author López-Oramas A.
dc.contributor.author Loporchio S.
dc.contributor.author Machado De Oliveira Fraga B.
dc.contributor.author Maggio C.
dc.contributor.author Majumdar P.
dc.date.accessioned 2022-02-09T20:30:35Z
dc.date.available 2022-02-09T20:30:35Z
dc.date.issued 2021
dc.identifier.issn 0004-6361
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/168638
dc.description.abstract Aims. We present a detailed characterisation and theoretical interpretation of the broadband emission of the paradigmatic TeV blazar Mrk 421, with a special focus on the multi-band flux correlations. Methods. The dataset has been collected through an extensive multi-wavelength campaign organised between 2016 December and 2017 June. The instruments involved are MAGIC, FACT, Fermi-LAT, Swift, GASP-WEBT, OVRO, Medicina, and Metsahovi. Additionally, four deep exposures (several hours long) with simultaneous MAGIC and NuSTAR observations allowed a precise measurement of the falling segments of the two spectral components. Results. The very-high-energy (VHE; E 100 GeV) gamma rays and X-rays are positively correlated at zero time lag, but the strength and characteristics of the correlation change substantially across the various energy bands probed. The VHE versus X-ray fluxes follow dierent patterns, partly due to substantial changes in the Compton dominance for a few days without a simultaneous increase in the X-ray flux (i.e., orphan gamma-ray activity). Studying the broadband spectral energy distribution (SED) during the days including NuSTAR observations, we show that these changes can be explained within a one-zone leptonic model with a blob that increases its size over time. The peak frequency of the synchrotron bump varies by two orders of magnitude throughout the campaign. Our multi-band correlation study also hints at an anti-correlation between UV-optical and X-ray at a significance higher than 3. A VHE flare observed on MJD 57788 (2017 February 4) shows gamma-ray variability on multi-hour timescales, with a factor ten increase in the TeV flux but only a moderate increase in the keV flux. The related broadband SED is better described by a two-zone leptonic scenario rather than by a one-zone scenario.We find that the flare can be produced by the appearance of a compact second blob populated by high energetic electrons spanning a narrow range of Lorentz factors, from 0 min = 2104 to 0 max = 6105.
dc.relation.ispartofseries Astronomy and Astrophysics
dc.subject BL Lacertae objects: individual: Mrk 421
dc.subject Galaxies: active
dc.subject Radiation mechanisms: non-thermal
dc.title Investigation of the correlation patterns and the Compton dominance variability of Mrk 421 in 2017
dc.type Article
dc.relation.ispartofseries-volume 655
dc.collection Публикации сотрудников КФУ
dc.source.id SCOPUS00046361-2021-655-SID85121042376


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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