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GLAST answers about high-energy peaked BL Lacs: double-humped γ-ray peak and extreme accelerators ?

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Costamante,  Luigi
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Aharonian,  Felix
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Khangulyan,  Dmitry
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Citation

Costamante, L., Aharonian, F., & Khangulyan, D. (2007). GLAST answers about high-energy peaked BL Lacs: double-humped γ-ray peak and extreme accelerators? In e. S. Ritz, & al. (Eds.), THE FIRST GLAST SYMPOSIUM (pp. 157-159). New York: AIP.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-7CCD-F
Abstract
An often overlooked fact is that the MeV-GeV emission from High-energy peaked BL Lacs (HBL) is basically unknown: there are only 3 objects of this type among all EGRET identified blazars with measured spectra. GLAST will be able to measure the spectrum for many of them, in particular TeV-blazars, and surprises are expected. GLAST will tell if the γ-ray peak in some HBL is actually a ``double peak'', as suggested by the comparison of EGRET and HESS data in PKS 2155-304, We also remind and argue that a new class of BL Lacs could exist, where particles are shock-accelerated near the maximum possible rate, characterized by the synchrotron emission peaking in the GLAST band (100 MeV - few GeV). Such objects could easily have escaped detection or identification so far, and could now be unveiled by GLAST.