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Markos Georganopoulos University of Maryland Baltimore County & NASA Goddard

Markos Georganopoulos University of Maryland Baltimore County & NASA Goddard. Is the GeV emission of blazars really produced inside the broad line region?. External Compton scattering off the broad line ~10 eV photons. Sikora, Begelman, & Rees ‘94 >Spherical broad line region

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Markos Georganopoulos University of Maryland Baltimore County & NASA Goddard

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  1. Markos GeorganopoulosUniversity of Maryland Baltimore County&NASA Goddard Is the GeV emission of blazars really produced inside the broad line region?

  2. External Compton scattering off the broad line ~10 eV photons Sikora, Begelman, & Rees ‘94 >Spherical broad line region with R~1017-18 cm Uo UBLRΓ2 oBLRΓ 2 10 -4 in mc2 units

  3. Kubo et al ‘98 Observed Compton dominance up to ~100 =>External Compton losses dominate photons of ~ few GeV  electrons of at least the same energy (γ~104) For seed photons o~10-4 oγ~1 GeV emission comes from scatterings in the gray area between the Thomson and Klein-Nishina regimes

  4. The devil is in the details… At GeV electron energies the cooling time is ~ energy independent! Effect on n(γ) ?

  5. The devil is in the details… At GeV electron energies the cooling time is ~ energy independent! Effect on n(γ) ?

  6. The electron distribution

  7. How EC dominated blazars should look • Unavoidable but unobserved marks: • The hump in the synchrotron component • 2. The flat/rising SED of the GeV component (rarely seen, typical GeV spectrum is steep) • 3. Achromatic variability for the synchrotron hump and the GeV regime.

  8. How EC dominated blazars should look • Unavoidable but unobserved marks: • The hump in the synchrotron component • 2. The flat/rising SED of the GeV component (rarely seen, typical GeV spectrum is steep) • 3. Achromatic variability for the synchrotron hump and the GeV regime.

  9. Download the code at: www.jca.umbc.edu/~markos/cs

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