Color Variability of AGNs

Details Color Variability of AGNs Color Variability of AGNs

2002-12-20

arxiv.org/abs/astro-ph/0212474v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, Mem. SAIt LaTeX class mem.cls, to appear in "Workshop on Variability with Wide Field Imagers", Lampedusa, I

Scientific paper

Optical spectral variability of quasars and BL Lac Objects is compared by means of the spectral variability parameter beta (Trevese & Vagnetti 2002). Both kinds of objects change their spectral slopes alpha, becoming bluer when brighter, but BL Lac Objects have smaller beta values and are clearly separated from quasars in the alpha-beta plane. Models accounting for the origin of the variability are discussed for both classes of objects.

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