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MODELING THE MULTIWAVELENGTH SPECTRA AND VARIABILITY OF 3C 66A IN 2003–2004
- Source :
- Astrophysics at Ultra-High Energies.
- Publication Year :
- 2007
- Publisher :
- WORLD SCIENTIFIC, 2007.
-
Abstract
- The BL Lac object 3C 66A was the target of an intensive multiwavelength monitoring campaign organized in 2003–2004. During the campaign, its spectral energy distribution (SED) was measured and flux measurements from radio to X-ray frequencies as well as upper limits in the very high energy (VHE) γ-ray regime were obtained. Here, we reproduce the SED and optical spectral variability pattern observed during our multiwavelength campaign using a time-dependent leptonic jet model. Our model could successfully simulate the observed SED and optical light curves and predict an intrinsic cutoff value for the VHE γ-ray emission at ~4 GeV implying the effect of the optical depth due to the intergalactic infrared background radiation (IIBR) to be negligible. Also, the contribution of external Comptonization (EIC), due to the presence of a broad-line region (BLR), in the emission of γ-ray photons could be significant early-on when the emission region is very close to the central engine but as it travels farther out, the production mechanism of hard X-ray and γ-ray photons becomes dominated by synchrotron self-Compton mechanism (SSC).
- Subjects :
- Physics
Nuclear and High Energy Physics
Photon
Infrared
Astrophysics::High Energy Astrophysical Phenomena
Astronomy
Astronomy and Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Light curve
Atomic and Molecular Physics, and Optics
Spectral line
Spectral energy distribution
Intergalactic travel
Astrophysics::Galaxy Astrophysics
Optical depth
BL Lac object
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Astrophysics at Ultra-High Energies
- Accession number :
- edsair.doi.dedup.....318da52f42169a855adbf366146b3e4c