On the viewing angle dependence of blazar variability

Research output: Contribution to journalArticlepeer-review


Internal shocks propagating through an ambient radiation field are subject to a radiative drag that, under certain conditions, can significantly affect their dynamics, and consequently the evolution of the beaming cone of emission produced behind the shocks. The resultant change of the Doppler factor combined with opacity effects leads to a strong dependence on the viewing angle of the variability pattern produced by such systems; specifically, the shape of the light curves and the characteristics of correlated emission. One implication is that objects oriented at relatively large viewing angles to the observer should exhibit a higher level of activity at high synchrotron frequencies (above the self-absorption frequency), and also at gamma-ray energies below the threshold energy of pair production, than at lower (radio/ millimetre) frequencies.

Original languageEnglish
Pages (from-to)641-646
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
StatePublished - 21 May 2000


  • Jets
  • Non-thermal - Relativity - Galaxies
  • Radiation mechanisms


Dive into the research topics of 'On the viewing angle dependence of blazar variability'. Together they form a unique fingerprint.

Cite this