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Infrared Variation of Blazars

J. H. Fan

astro-pharXiv:astro-ph/9910269

Abstract

In this paper, the historical infrared (JHK) data compiled from the published literature are presented here for 30 blazars. Maximum near-IR variations are found and compared with the optical ones. For the color-magnitude relation, some objects show that the color index increases with magnitude while 1253-055 shows complex behaviour, which perhaps suggests that the emission mechanism consists of, at least, two parts. The spectral indexes are in the range of αIR = 0.77 to 2.37.

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