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MULTIWAVELENGTH STUDY OF QUIESCENT STATES OF MRK 421 WITH UNPRECEDENTED HARD X-RAY COVERAGE PROVIDED BY NuSTAR IN 2013

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dc.contributor.author Baloković M.
dc.contributor.author Paneque D.
dc.contributor.author Madejski G.
dc.contributor.author Furniss A.
dc.contributor.author Chiang J.
dc.contributor.author Ajello M.
dc.contributor.author Alexander D.
dc.contributor.author Barret D.
dc.contributor.author Blandford R.
dc.contributor.author Boggs S.
dc.contributor.author Christensen F.
dc.contributor.author Craig W.
dc.contributor.author Forster K.
dc.contributor.author Giommi P.
dc.contributor.author Grefenstette B.
dc.contributor.author Hailey C.
dc.contributor.author Harrison F.
dc.contributor.author Hornstrup A.
dc.contributor.author Kitaguchi T.
dc.contributor.author Koglin J.
dc.contributor.author Madsen K.
dc.contributor.author Mao P.
dc.contributor.author Miyasaka H.
dc.contributor.author Mori K.
dc.contributor.author Perri M.
dc.contributor.author Pivovaroff M.
dc.contributor.author Puccetti S.
dc.contributor.author Rana V.
dc.contributor.author Stern D.
dc.contributor.author Tagliaferri G.
dc.contributor.author Urry C.
dc.contributor.author Westergaard N.
dc.contributor.author Zhang W.
dc.contributor.author Zoglauer A.
dc.contributor.author Archambault S.
dc.contributor.author Archer A.
dc.contributor.author Barnacka A.
dc.contributor.author Benbow W.
dc.contributor.author Bird R.
dc.contributor.author Buckley J.
dc.contributor.author Bugaev V.
dc.contributor.author Cerruti M.
dc.contributor.author Chen X.
dc.contributor.author Ciupik L.
dc.contributor.author Connolly M.
dc.contributor.author Cui W.
dc.contributor.author Dickinson H.
dc.contributor.author Dumm J.
dc.contributor.author Eisch J.
dc.contributor.author Falcone A.
dc.contributor.author Feng Q.
dc.contributor.author Finley J.
dc.contributor.author Fleischhack H.
dc.contributor.author Fortson L.
dc.contributor.author Griffin S.
dc.contributor.author Griffiths S.
dc.contributor.author Grube J.
dc.contributor.author Gyuk G.
dc.contributor.author Huetten M.
dc.contributor.author Håkansson N.
dc.contributor.author Holder J.
dc.contributor.author Humensky T.
dc.contributor.author Johnson C.
dc.contributor.author Kaaret P.
dc.contributor.author Kertzman M.
dc.contributor.author Khassen Y.
dc.contributor.author Kieda D.
dc.contributor.author Krause M.
dc.contributor.author Krennrich F.
dc.contributor.author Lang M.
dc.contributor.author Maier G.
dc.contributor.author McArthur S.
dc.contributor.author Meagher K.
dc.contributor.author Moriarty P.
dc.contributor.author Nelson T.
dc.contributor.author Nieto D.
dc.contributor.author Ong R.
dc.contributor.author Park N.
dc.contributor.author Pohl M.
dc.contributor.author Popkow A.
dc.contributor.author Pueschel E.
dc.contributor.author Reynolds P.
dc.contributor.author Richards G.
dc.contributor.author Roache E.
dc.contributor.author Santander M.
dc.contributor.author Sembroski G.
dc.contributor.author Shahinyan K.
dc.contributor.author Smith A.
dc.contributor.author Staszak D.
dc.contributor.author Telezhinsky I.
dc.contributor.author Todd N.
dc.date.accessioned 2018-09-19T20:06:16Z
dc.date.available 2018-09-19T20:06:16Z
dc.date.issued 2016
dc.identifier.issn 0004-637X
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/142559
dc.description.abstract © 2016. The American Astronomical Society. All rights reserved.We present coordinated multiwavelength observations of the bright, nearby BL Lacertae object Mrk 421 taken in 2013 January-March, involving GASP-WEBT, Swift, NuSTAR, Fermi-LAT, MAGIC, VERITAS, and other collaborations and instruments, providing data from radio to very high energy (VHE) γ-ray bands. NuSTAR yielded previously unattainable sensitivity in the 3-79 keV range, revealing that the spectrum softens when the source is dimmer until the X-ray spectral shape saturates into a steep Γ ≈ 3 power law, with no evidence for an exponential cutoff or additional hard components up to ∼80 keV. For the first time, we observed both the synchrotron and the inverse-Compton peaks of the spectral energy distribution (SED) simultaneously shifted to frequencies below the typical quiescent state by an order of magnitude. The fractional variability as a function of photon energy shows a double-bump structure that relates to the two bumps of the broadband SED. In each bump, the variability increases with energy, which, in the framework of the synchrotron self-Compton model, implies that the electrons with higher energies are more variable. The measured multi band variability, the significant X-ray-to-VHE correlation down to some of the lowest fluxes ever observed in both bands, the lack of correlation between optical/UV and X-ray flux, the low degree of polarization and its significant (random) variations, the short estimated electron cooling time, and the significantly longer variability timescale observed in the NuSTAR light curves point toward in situ electron acceleration and suggest that there are multiple compact regions contributing to the broadband emission of Mrk 421 during low-activity states.
dc.relation.ispartofseries Astrophysical Journal
dc.subject BL Lacertae objects: individual (Markarian 421)
dc.subject galaxies: active
dc.subject gamma rays: general
dc.subject radiation mechanisms: nonthermal
dc.subject X-rays: galaxies
dc.title MULTIWAVELENGTH STUDY OF QUIESCENT STATES OF MRK 421 WITH UNPRECEDENTED HARD X-RAY COVERAGE PROVIDED BY NuSTAR IN 2013
dc.type Article
dc.relation.ispartofseries-issue 2
dc.relation.ispartofseries-volume 819
dc.collection Публикации сотрудников КФУ
dc.source.id SCOPUS0004637X-2016-819-2-SID84961655196


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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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