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Title: Insights into the emission of the blazar 1ES 1011+496 through unprecedented broadband observations during 2011 and 2012

1ES 1011+496 (z = 0.212) was discovered in very high-energy (VHE, E> 100 GeV) γ rays with MAGIC in 2007. The absence of simultaneous data at lower energies led to an incomplete characterization of the broadband spectral energy distribution (SED). In this paper, we study the source properties and the emission mechanisms, probing whether a simple one-zone synchrotron self-Compton (SSC) scenario is able to explain the observed broadband spectrum. We analyzed data in the range from VHE to radio data from 2011 and 2012 collected by MAGIC, Fermi-LAT, Swift, KVA, OVRO, and Metsähovi in addition to optical polarimetry data and radio maps from the Liverpool Telescope and MOJAVE. The VHE spectrum was fit with a simple power law with a photon index of 3.69 ± 0.22 and a flux above 150 GeV of (1.46 ± 0.16) x 10 -11 ph cm -2s -1. The source 1ES 1011+496 was found to be in a generally quiescent state at all observed wavelengths, showing only moderate variability from radio to X-rays. A low degree of polarization of less than 10% was measured in optical, while some bright features polarized up to 60% were observed in the radio jet. A similar trend in themore » rotation of the electric vector position angle was found in optical and radio. The radio maps indicated a superluminal motion of 1.8 ± 0.4 c, which is the highest speed statistically significant measured so far in a high-frequency-peaked BL Lac. For the first time, the high-energy bump in the broadband SED of 1ES 1011+496 could be fully characterized from 0.1 GeV to 1 TeV, which permitted a more reliable interpretation within the one-zone SSC scenario. Finally, the polarimetry data suggest that at least part of the optical emission has its origin in some of the bright radio features, while the low polarization in optical might be due to the contribution of parts of the radio jet with different orientations of the magnetic field with respect to the optical emission.« less
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Publication Date:
Grant/Contract Number:
AC02-76SF00515; NNX08AW31G; NNX11A043G; AST-0808050; AST-1109911; FPA2012-39502; NNX12A087; 745/N-HESS-MAGIC/2010/0; SFB823/C4; SFB876/C3; 268740; SEV-2012-0234; CPAN CSD2007-00042; CSD2009-00064
Type:
Accepted Manuscript
Journal Name:
Astronomy and Astrophysics
Additional Journal Information:
Journal Volume: 591; Journal ID: ISSN 0004-6361
Publisher:
EDP Sciences
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE; National Aeronautic and Space Administration (NASA); German Federal Ministry of Education and Research (BMBF); Max Planck Society (MPG) (Germany); National Institute for Nuclear Physics (INFN) (Italy); National Institute for Astrophysics (INAF) (Italy); Swiss National Science Foundation (SNSF); Ministry of Economy, Industry and Competitiveness (MINECO) (Spain); Japan Society for the Promotion of Science (JSPS) (Japan); Ministry of Education, Culture, Sports, Science and Technology (MEXT) (Japan); Academy of Finland; Croatian Science Foundation (HrZZ) (Croatia); Univ. of Rijeka (Croatia); German Research Foundation (DFG); Ministry of Science and Higher Education (MNiSzW) (Poland)
Contributing Orgs:
Fermi LAT Collaboration
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; BL Lacertae objects: individual: 1ES 1011+496; galaxies: active; galaxies: jets; radiation mechanisms: non-thermal; gamma rays: galaxies
OSTI Identifier:
1355701