Spectral Slope Variability of BL Lac Objects in the Optical Band

Details Spectral Slope Variability of BL Lac Objects in the Optical Band Spectral Slope Variability of BL Lac Objects in the Optical Band

2002-12-23

arxiv.org/abs/astro-ph/0212524v2

Astrophys.J. 590 (2003) 123-127

Astronomy and Astrophysics

Astrophysics

15 pages, 5 figures, to appear in ApJ, June 2003

Scientific paper

10.1086/374889

Light curves of eight BL Lac objects in the BVRI bands have been analyzed. All of the objects tend to be bluer when brighter. However spectral slope changes differ quantitatively from those of a sample of QSOs analyzed in a previous paper (Trevese & Vagnetti 2002) and appear consistent with a different nature of the optical continuum. A simple model representing the variability of a synchrotron component can explain the spectral changes. Constraints on a possible thermal accretion disk component contributing to the optical luminosity are discussed.

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