Erratic flaring of BL LAC in 2012-2013

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dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorWehrle, Ann E.
dc.contributor.authorGrupe, Dirk
dc.contributor.authorJorstad, Svetlana G.
dc.contributor.authorMarscher, Alan P.
dc.contributor.authorGurwell, Mark
dc.contributor.authorBaloković, Mislav
dc.contributor.authorHovatta, Talvikki
dc.contributor.authorMadejski, Grzegorz M.
dc.contributor.authorHarrison, Fiona H.
dc.contributor.authorStern, Daniel
dc.contributor.departmentSpace Science Institute
dc.contributor.departmentMorehead State University
dc.contributor.departmentSt. Petersburg State University
dc.contributor.departmentBoston University
dc.contributor.departmentHarvard-Smithsonian Center for Astrophysics
dc.contributor.departmentCahill Center for Astronomy and Astrophysics
dc.contributor.departmentSLAC National Accelerator Laboratory
dc.contributor.departmentCalifornia Institute of Technology
dc.date.accessioned2016-09-16T10:02:53Z
dc.date.issued2016-01-10
dc.description.abstractBL Lac, the eponymous blazar, flared to historically high levels at millimeter, infrared, X-ray, and gamma-ray wavelengths in 2012. We present observations made with Herschel, Swift, NuSTAR, Fermi, the Submillimeter Array, CARMA, and the VLBA in 2012-2013, including three months with nearly daily sampling at several wavebands. We have also conducted an intensive campaign of 30 hr with every-orbit observations by Swift and NuSTAR, accompanied by Herschel, and Fermi observations. The source was highly variable at all bands. Time lags, correlations between bands, and the changing shapes of the spectral energy distributions can be explained by synchrotron radiation and inverse Compton emission from nonthermal seed photons originating from within the jet. The passage of four new superluminal very long baseline interferometry knots through the core and two stationary knots about 4 pc downstream accompanied the high flaring in 2012-2013. The seed photons for inverse Compton scattering may arise from the stationary knots and from a Mach disk near the core where relatively slow-moving plasma generates intense nonthermal radiation. The 95 spectral energy distributions obtained on consecutive days form the most densely sampled, broad wavelength coverage for any blazar. The observed spectral energy distributions and multi-waveband light curves are similar to simulated spectral energy distributions and light curves generated with a model in which turbulent plasma crosses a conical shock with a Mach disk.en
dc.description.versionPeer revieweden
dc.format.extent26
dc.format.mimetypeapplication/pdf
dc.identifier.citationWehrle , A E , Grupe , D , Jorstad , S G , Marscher , A P , Gurwell , M , Baloković , M , Hovatta , T , Madejski , G M , Harrison , F H & Stern , D 2016 , ' Erratic flaring of BL LAC in 2012-2013 : Multiwavelength observations ' , The Astrophysical Journal , vol. 816 , no. 2 , 53 . https://doi.org/10.3847/0004-637X/816/2/53en
dc.identifier.doi10.3847/0004-637X/816/2/53
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357
dc.identifier.otherPURE UUID: 86761b6a-bd03-453c-b4ec-958eb14adfe0
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/86761b6a-bd03-453c-b4ec-958eb14adfe0
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=84954472090&partnerID=8YFLogxK
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/6554482/Erratic_flaring_of_BL_LAC.pdf
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/22039
dc.identifier.urnURN:NBN:fi:aalto-201609163921
dc.language.isoenen
dc.relation.ispartofseriesASTROPHYSICAL JOURNALen
dc.relation.ispartofseriesVolume 816, issue 2en
dc.rightsopenAccessen
dc.subject.keywordBL Lacertae objects: individual (BL Lacertae)
dc.subject.keywordgalaxies: active
dc.subject.keywordgalaxies: individual (BL Lacertae)
dc.subject.keywordgalaxies: jets
dc.titleErratic flaring of BL LAC in 2012-2013en
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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