Red and blue blazars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Active And Peculiar Galaxies And Related Systems, Jets And Bursts, Galactic Winds And Fountains

Scientific paper

Being dominated by relativistic jets oriented close to the line of sight, blazars are rare laboratories to study jet physics. The first clues are provided by their broad-band Spectral Energy Distributions (SEDs) and the observed spectral trends with bolometric luminosity. These show that a rich variety of SED shapes exist, with so-called red and blue sources forming the two extremes of a continuous distribution. These trends can be understood in terms of different preferred cooling mechanisms in the jet, which in turn depend on source power and the jet's ambient radiation. Here I summarize nearly one decade of study of blazars SEDs, pointing out possible selection biases affecting current datasets. .

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