| Abstract: | In this paper, the variations of BL Lac objects in the infrared band are given. The relation between infrared magnitude-K
and redshift is discussed for BL Lac objects, FRI, and FRII(G) radio galaxies. The results show that the faintest optical
and infrared magnitudes are correlated, the BL Lac objects with large infrared variation have large optical variation, and
the unified scheme of BL Lac objects should include FRI and FRII(G) radio galaxies, which support the results of Xie et al.
(1993) and Owen, Ledlow and Keel (1996).
This revised version was published online in July 2006 with corrections to the Cover Date. |
