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Extreme blazars studied with Fermi-LAT and Suzaku : 1ES 0347–121 and blazar candidate HESS J1943+213

Extreme blazars studied with Fermi-LAT and Suzaku : ...

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dc.contributor.author Tanaka, Y. T. pl
dc.contributor.author Stawarz, Łukasz [SAP11018649] pl
dc.contributor.author Finke, J. pl
dc.contributor.author Cheung, C. C. pl
dc.contributor.author Dermer, C. D. pl
dc.contributor.author Kataoka, J. pl
dc.contributor.author Bamba, A. pl
dc.contributor.author Dubus, G. pl
dc.contributor.author DeNaurois, M. pl
dc.contributor.author Wagner, S. J. pl
dc.contributor.author Fukazawa, Y. pl
dc.contributor.author Thompson, D. J. pl
dc.date.accessioned 2015-03-19T15:21:15Z
dc.date.available 2015-03-19T15:21:15Z
dc.date.issued 2014 pl
dc.identifier.issn 0004-637X pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/4003
dc.language eng pl
dc.title Extreme blazars studied with Fermi-LAT and Suzaku : 1ES 0347–121 and blazar candidate HESS J1943+213 pl
dc.type JournalArticle pl
dc.abstract.en We report on our study of high-energy properties of two peculiar TeV emitters: the "extreme blazar" 1ES 0347–121 and the "extreme blazar candidate" HESS J1943+213 located near the Galactic plane. Both objects are characterized by quiescent synchrotron emission with flat spectra extending up to the hard X-ray range, and both were reported to be missing GeV counterparts in the Fermi Large Area Telescope (LAT) two-year Source Catalog. We analyze a 4.5 yr accumulation of the Fermi -LAT data, resulting in the detection of 1ES 0347–121 in the GeV band, as well as in improved upper limits for HESS J1943+213. We also present the analysis results of newly acquired Suzaku data for HESS J1943+213. The X-ray spectrum is well represented by a single power law extending up to 25 keV with photon index 2.00 \pm 0.02 and a moderate absorption in excess of the Galactic value, which is in agreement with previous X-ray observations. No short-term X-ray variability was found over the 80 ks duration of the Suzaku exposure. Under the blazar hypothesis, we modeled the spectral energy distributions of 1ES 0347–121 and HESS J1943+213, and we derived constraints on the intergalactic magnetic field strength and source energetics. We conclude that although the classification of HESS J1943+213 has not yet been determined, the blazar hypothesis remains the most plausible option since, in particular, the broadband spectra of the two analyzed sources along with the source model parameters closely resemble each other, and the newly available Wide-field Infrared Survey Explorer and UKIRT Infrared Deep Sky Survey data for HESS J1943+213 are consistent with the presence of an elliptical host at the distance of approximately ~600 Mpc. pl
dc.subject.en BL Lacertae objects: individual (HESS J1943+213, 1ES 0347-121) pl
dc.subject.en galaxies: active pl
dc.subject.en galaxies: jets pl
dc.subject.en gamma rays: galaxies pl
dc.subject.en radiation mechanisms: non-thermal pl
dc.subject.en X-rays: galaxies pl
dc.description.volume 787 pl
dc.description.number 2 pl
dc.identifier.doi 10.1088/0004-637X/787/2/155 pl
dc.identifier.eissn 1538-4357 pl
dc.title.journal The Astrophysical Journal pl
dc.language.container eng pl
dc.affiliation Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne pl
dc.subtype Article pl
dc.identifier.articleid 155 pl
dc.rights.original OTHER; otwarte czasopismo; ostateczna wersja wydawcy; po opublikowaniu; 12 pl
.pointsMNiSW [2014 A]: 40

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