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

Journal Article · · Monthly Notices of the Royal Astronomical Society
 [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
+ Show Author Affiliations

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.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Contributing Organization:
Fermi LAT Collaboration
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1354902
Journal Information:
Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 3 Vol. 454; ISSN 0035-8711
Publisher:
Royal Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Megaparsec-scale Radio Structure Associated with a Hybrid Blazar SBS B1646+499: Episodic Jet Activity with Precessing Axis journal November 2018
Megaparsec-scale Radio Structure Associated with a Hybrid Blazar SBS B1646+499: Episodic Jet Activity with Precessing Axis text January 2018

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
BL lacertae objects: individual: AP librae
galaxies: active
galaxies: jets