The blazar sequence: validity and predictions |
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| Authors: | Paolo Padovani |
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| Institution: | (1) European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany |
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| 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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| Keywords: | Blazars Jets Emission processes |
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