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Title: From radio to TeV: the surprising spectral energy distribution of AP Librae

Following the discovery of high-energy (HE; E > 10 MeV) and very-high-energy (VHE; E > 100 GeV) γ-ray emission from the low-frequency-peaked BL Lac (LBL) object AP Librae, its electromagnetic spectrum is studied over 60 octaves in energy. Contemporaneous data in radio, optical and UV together with the (non-simultaneous) γ-ray data are used to construct the most precise spectral energy distribution of this source. We found that the data was modelled with difficulties with single-zone homogeneous leptonic synchrotron self-Compton (SSC) radiative scenarios due to the unprecedented width of the HE component when compared to the lower-energy component. Furthermore, the two other LBL objects also detected at VHE appear to have similar modelling difficulties. Nevertheless, VHE γ-rays produced in the extended jet could account for the VHE flux observed by HESS.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [4] ;  [2] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11]
  1. Univ. of Savoy (France). Annecy-le-Vieux Particle Physics Lab.
  2. Ecole Polytechnique Federale Lausanne (Switzlerland). Leprince-Ringuet Lab.
  3. Harvard-Smithsonian Center for Astrophysics, Amado, AZ (United States). Fred Lawrence Whipple Observatory
  4. Stanford Univ., CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology. Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States)
  5. Stanford Univ., CA (United States); Univ. of Wurzburg (Germany)
  6. US Naval Research Lab., Washington, DC (United States)
  7. Univ. of Wurzburg (Germany)
  8. Astro Space Center of Lebedev Physical Inst., Moscow (Russia); Max Planck Inst. for Radio Astronomy, Bonn (Germany)
  9. Purdue Univ., West Lafayette, IN (United States). Dept. of Physics
  10. Max Planck Inst. for Radio Astronomy, Bonn (Germany); Crimean Astrophysical Observatory (Russia); Pulkova Observatory, St. Petersburg (Russia)
  11. Max Planck Inst. for Radio Astronomy, Bonn (Germany); Aalto Univ., Kylmala (Finland). Metsahovi Radio Observatory
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 454; Journal Issue: 3; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
Fermi LAT Collaboration
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; galaxies: active; BL lacertae objects: individual: AP librae; galaxies: jets
OSTI Identifier:
1354902

Sanchez, D. A., Giebels, B., Fortin, P., Horan, D., Szostek, A., Fegan, S., Baczko, A. -K., Finke, J., Kadler, M. L., Kovalev, Y. Y., Lister, M. L., Pushkarev, A. B., and Savolainen, T.. From radio to TeV: the surprising spectral energy distribution of AP Librae. United States: N. p., Web. doi:10.1093/mnras/stv2151.
Sanchez, D. A., Giebels, B., Fortin, P., Horan, D., Szostek, A., Fegan, S., Baczko, A. -K., Finke, J., Kadler, M. L., Kovalev, Y. Y., Lister, M. L., Pushkarev, A. B., & Savolainen, T.. From radio to TeV: the surprising spectral energy distribution of AP Librae. United States. doi:10.1093/mnras/stv2151.
Sanchez, D. A., Giebels, B., Fortin, P., Horan, D., Szostek, A., Fegan, S., Baczko, A. -K., Finke, J., Kadler, M. L., Kovalev, Y. Y., Lister, M. L., Pushkarev, A. B., and Savolainen, T.. 2015. "From radio to TeV: the surprising spectral energy distribution of AP Librae". United States. doi:10.1093/mnras/stv2151. https://www.osti.gov/servlets/purl/1354902.
@article{osti_1354902,
title = {From radio to TeV: the surprising spectral energy distribution of AP Librae},
author = {Sanchez, D. A. and Giebels, B. and Fortin, P. and Horan, D. and Szostek, A. and Fegan, S. and Baczko, A. -K. and Finke, J. and Kadler, M. L. and Kovalev, Y. Y. and Lister, M. L. and Pushkarev, A. B. and Savolainen, T.},
abstractNote = {Following the discovery of high-energy (HE; E > 10 MeV) and very-high-energy (VHE; E > 100 GeV) γ-ray emission from the low-frequency-peaked BL Lac (LBL) object AP Librae, its electromagnetic spectrum is studied over 60 octaves in energy. Contemporaneous data in radio, optical and UV together with the (non-simultaneous) γ-ray data are used to construct the most precise spectral energy distribution of this source. We found that the data was modelled with difficulties with single-zone homogeneous leptonic synchrotron self-Compton (SSC) radiative scenarios due to the unprecedented width of the HE component when compared to the lower-energy component. Furthermore, the two other LBL objects also detected at VHE appear to have similar modelling difficulties. Nevertheless, VHE γ-rays produced in the extended jet could account for the VHE flux observed by HESS.},
doi = {10.1093/mnras/stv2151},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 454,
place = {United States},
year = {2015},
month = {10}
}