Sep 12 – 16, 2016
Europe/Zurich timezone
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Orphan gamma-ray flares from relativistic blobs comptonizing radiation of luminous stars in jets of AGNs

Sep 12, 2016, 6:00 PM
500/1-001 - Main Auditorium (CERN)

500/1-001 - Main Auditorium


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Oral Contributions Gamma-ray astrophysics Gamma-ray astrophysics


Wlodek Bednarek (University of Lodz)


Massive black holes in active galaxies are surrounded by bulges of both evolved late type and also young luminous stars in nuclear stellar clusters. The luminous stars can enter a jet region which contain fast moving blobs filled with relativistic electrons. We calculate
the gamma-ray spectra and light curves produced by these electrons in the Inverse Compton electron-positron pair cascade process. Such scenario can explain the appearance of the orphan gamma-ray flares in blazars. As an example, we model the GeV and TeV gamma-ray emission from the nearby BL Lac type AGNs (1ES 1959+650 or Mrk 421) and from a distant
FSRQ PKS 1222+21.


We consider the mechanism for orphan gamma-ray flares in blazars in which blobs containing relativistic electrons in the jet encounter luminous stars. Gamma-rays are produced in the inverse Compton electron-positron pair cascade initiated by electrons in the soft radiation of the star. As an example, we discuss application of such scenario to specific objects.

Primary author

Wlodek Bednarek (University of Lodz)


Dr Julian Sitarek (University of Lodz, Lodz,Poland)

Presentation materials