Extreme Blazars Studied With Fermi -Lat And Suzaku : 1es 0347–121 And Blazar Candidate Hess J1943+213

Tanaka, Y. T.; Stawarz, Ł.; Finke, J.; Cheung, C. C.; Dermer, C. D.; Kataoka, J.; Bamba, A.; Dubus, G.; De Naurois, M.; Wagner, S. J.; Fukazawa, Y.; Thompson, D. J.

doi:10.1088/0004-637X/787/2/155

Title: Extreme Blazars Studied With Fermi -Lat And Suzaku : 1es 0347–121 And Blazar Candidate Hess J1943+213

Journal Article · Wed May 14 00:00:00 EDT 2014 · The Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/787/2/155· OSTI ID:1356469

Tanaka, Y. T. ^[1]; Stawarz, Ł. ^[2]; Finke, J. ^[3]; Cheung, C. C. ^[3];

^[3]; Kataoka, J. ^[4]; Bamba, A. ^[5];

^[6]; De Naurois, M. ^[7]; Wagner, S. J. ^[8]; Fukazawa, Y. ^[1]; Thompson, D. J. ^[9]

Hiroshima Univ. (Japan)
Japan Aerospace Exploration Agency, Kanagawa (Japan). Inst. of Space and Astronautical Science; Jagiellonian Univ., Krakow (Poland)
Naval Research Lab. (NRL), Washington, DC (United States)
Waseda Univ., Shinjuku (Japan)
Aoyama Gakuin Univ., Tokyo (Japan)
Inst. de Planetologie et d'Astrophysique de Grenoble (France)
Ecole Polytechnique, Palaiseau (France)
Univ. of Heidelberg (Germany)
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)

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-LAT 2–year Source Catalog. We analyze a 4.5 year 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±0.02 and a moderate absorption in excess of the Galactic value, in agreementwith 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 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 broad-band spectra of the two analyzed sources along with the source model parameters closely resemble each other, and the newly available WISE and UKIDSS data for HESS J1943+213 are consistent with the presence of an elliptical host at the distance of approximatel ~ 600Mpc.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1356469

Journal Information:: The Astrophysical Journal, Vol. 787, Issue 2; ISSN 0004-637X

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 21 works

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A hadronic origin for ultra-high-frequency-peaked BL Lac objects Cerruti, M.; Zech, A.; Boisson, C. arXiv https://doi.org/10.48550/arxiv.1411.5968	text	January 2014
Baryon Loading Efficiency and Particle Acceleration Efficiency of Relativistic Jets: Cases For Low Luminosity BL Lacs Inoue, Yoshiyuki; Tanaka, Yasuyuki T. arXiv https://doi.org/10.48550/arxiv.1603.07623	text	January 2016
HESS J1943+213: An Extreme Blazar Shining Through The Galactic Plane Collaboration, The VERITAS; Archer, A.; Benbow, W. arXiv https://doi.org/10.48550/arxiv.1806.04144	text	January 2018

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Title: Extreme Blazars Studied With Fermi -Lat And Suzaku : 1es 0347–121 And Blazar Candidate Hess J1943+213

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