Physical Model for the Revised Blazar Sequence

Details Physical Model for the Revised Blazar Sequence Physical Model for the Revised Blazar Sequence

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21914008f&link_type=abstract

American Astronomical Society, AAS Meeting #219, #140.08

Astronomy and Astrophysics

Astronomy

Scientific paper

The blazar sequence is reflected in a plot of the peak luminosity versus peak frequency of the synchrotron component of blazars. This diagram has been considered one of the fundamental pieces of evidence for the existence of a continuous sequence that includes low-power BL Lacertae objects through high-power flat spectrum radio quasars. Recently, Meyer et al. have shown that this plot displays an "L" or "V" shape that was not apparent in earlier representations of the blazar sequence. We find that this shape can be reproduced by a simple model where the external radiation field increases with increasing injection power of jet electrons. This leads to greater cooling of the electrons, which moves the synchrotron peak to lower frequencies. For more powerful injection, the electron cooling Lorentz factor becomes less than the minimum injected electron Lorentz factor, causing the peak frequency to become nearly independent of the jet power. The difference in viewing angles of different blazars can explain the scatter in the sequence.

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