Active galactic nuclei

descriptionPublicationkeyboard_double_arrow_right Part of book or chapter of book , Other literature type 30 Jun 2014 English Publisher:Springer Berlin Heidelberg

Authors: Peter Schneider;

doi: 10.1007/978-3-642-54083-7_5

Active galactic nuclei

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Abstract

The light of normal galaxies in the optical and near infrared part of the spectrum is dominated by stars, with small contributions by gas and dust. This is thermal radiation since the emitting plasma in stellar atmospheres is basically in thermodynamical equilibrium. To a first approximation, the spectral properties of a star can be described by a Planck spectrum whose temperature depends on the stellar mass and the evolutionary state of the star.

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University of Bonn
Germany

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