Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/96037
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dc.contributor.authorNuSTAR Team-
dc.contributor.authorMAGIC Collaboration-
dc.contributor.authorVERITAS Collaboration-
dc.contributor.authorF-Gamma Consortium-
dc.contributor.authorGalindo Fernández, Daniel-
dc.contributor.authorMarcote Martin, Benito-
dc.contributor.authorParedes i Poy, Josep Maria-
dc.contributor.authorParedes Fortuny, Xavier-
dc.contributor.authorRibó Gomis, Marc-
dc.contributor.authorZanin, Roberta-
dc.date.accessioned2016-03-02T08:54:48Z-
dc.date.available2016-03-02T08:54:48Z-
dc.date.issued2015-10-22-
dc.identifier.issn0004-637X-
dc.identifier.urihttps://hdl.handle.net/2445/96037-
dc.description.abstractWe report on simultaneous broadband observations of the TeV-emitting blazar Markarian 501 between 2013 April 1 and August 10, including the first detailed characterization of the synchrotron peak with Swift and NuSTAR. During the campaign, the nearby BL Lac object was observed in both a quiescent and an elevated state. The broadband campaign includes observations with NuSTAR, MAGIC, VERITAS, the Fermi Large Area Telescope, Swift X-ray Telescope and UV Optical Telescope, various ground-based optical instruments, including the GASP-WEBT program, as well as radio observations by OVRO, Metsähovi, and the F-Gamma consortium. Some of the MAGIC observations were affected by a sand layer from the Saharan desert, and had to be corrected using event-by-event corrections derived with a Light Detection and Ranging (LIDAR) facility. This is the first time that LIDAR information is used to produce a physics result with Cherenkov Telescope data taken during adverse atmospheric conditions, and hence sets a precedent for the current and future ground-based gamma-ray instruments. The NuSTAR instrument provides unprecedented sensitivity in hard X-rays, showing the source to display a spectral energy distribution (SED) between 3 and 79 keV consistent with a log-parabolic spectrum and hard X-ray variability on hour timescales. None (of the four extended NuSTAR observations) show evidence of the onset of inverse-Compton emission at hard X-ray energies. We apply a single-zone equilibrium synchrotron self-Compton (SSC) model to five simultaneous broadband SEDs. We find that the SSC model can reproduce the observed broadband states through a decrease in the magnetic field strength coinciding with an increase in the luminosity and hardness of the relativistic leptons responsible for the high-energy emission.-
dc.format.extent22 p.-
dc.format.mimetypeapplication/pdf-
dc.language.isoeng-
dc.publisherInstitute of Physics (IOP)-
dc.relation.isformatofReproducció del document publicat a: http://dx.doi.org/10.1088/0004-637X/812/1/65-
dc.relation.ispartofAstrophysical Journal, 2015, vol. 812, num. 1-
dc.relation.urihttp://dx.doi.org/10.1088/0004-637X/812/1/65-
dc.rights(c) American Astronomical Society, 2015-
dc.sourceArticles publicats en revistes (Física Quàntica i Astrofísica)-
dc.subject.classificationGalàxies-
dc.subject.classificationRaigs X-
dc.subject.otherGalaxies-
dc.subject.otherX-rays-
dc.titleFirst NuSTAR Observations of Mrk 501 within a Radio to TeV Multi-Instrument Campaign-
dc.typeinfo:eu-repo/semantics/article-
dc.typeinfo:eu-repo/semantics/publishedVersion-
dc.identifier.idgrec657261-
dc.date.updated2016-03-02T08:54:53Z-
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess-
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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