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Stockholm University, Faculty of Science, Department of Astronomy.
2010 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 723, no 1, 417-424 p.Article in journal (Refereed) Published
Abstract [en]

The high frequency component in blazars is thought to be due to inverse Compton scattered radiation. Recent observations by Fermi-LAT are used to evaluate the details of the scattering process. A comparison is made between the usually assumed single scattering scenario and one in which multiple scatterings are energetically important. In the latter case, most of the radiation is emitted in the Klein-Nishina limit. It is argued that several of the observed correlations defining the blazar sequence are most easily understood in a multiple scattering scenario. Observations indicate also that, in such a scenario, the blazar sequence is primarily governed by the energy density of relativistic electrons rather than that of the seed photons. The pronounced X-ray minimum in the spectral energy distribution often observed in the most luminous blazars is discussed. It is shown how this feature can be accounted for in a multiple scattering scenario by an extension of standard one-zone models.

Place, publisher, year, edition, pages
2010. Vol. 723, no 1, 417-424 p.
Keyword [en]
BL Lacertae objects: general, galaxies: active, gamma rays: general
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-51432DOI: 10.1088/0004-637X/723/1/417ISI: 000284090100035OAI: diva2:385693
authorCount :1Available from: 2011-01-12 Created: 2011-01-10 Last updated: 2011-01-12Bibliographically approved

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Björnsson, Claes-Ingvar
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