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Title:
The blazar sequence: validity and predictions
Authors:
Padovani, Paolo
Affiliation:
AA(European Southern Observatory)
Publication:
Astrophysics and Space Science, Volume 309, Issue 1-4, pp. 63-71 (Ap&SS Homepage)
Publication Date:
06/2007
Origin:
SPRINGER
DOI:
10.1007/s10509-007-9455-2
Bibliographic Code:
2007Ap&SS.309...63P

Abstract

The “blazar sequence” posits that the most powerful BL Lacertae objects and flat-spectrum radio quasars should have relatively small synchrotron peak frequencies, ν peak, and that the least powerful such objects should have the highest ν peak values. This would have strong implications for our understanding of jet formation and physics and the possible detection of powerful, moderately high-redshift TeV blazars. I review the validity of the blazar sequence by using the results of very recent surveys and compare its detailed predictions against observational data. I find that the blazar sequence in its simplest form is ruled out. However, powerful flat-spectrum radio quasars appear not to reach the ν peak typical of BL Lacs. This could indeed be related to some sort of sequence, although it cannot be excluded that it is instead due to a selection effect.
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