Abstract
We present the results of the monitoring of a sample of 5 HBLs in the B, V and R bands during 2003–2008. All sources in our monitoring project show significant rapid optical variations, except 1ES 1959+650, however; for 1ES 1959+650, the gamma-ray variability on a timescale of ∼7 hours has been observed by Holder et al. (Astrophys. J. 583:L9, 2003). Using these variability timescales, we estimate the black hole masses for each source with the Kerr black hole theory.
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Ma, L., Xie, G.Z., Yi, T.F. et al. CCD photometry of five X-ray selected BL Lacertae objects. Astrophys Space Sci 327, 35–58 (2010). https://doi.org/10.1007/s10509-010-0268-3
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DOI: https://doi.org/10.1007/s10509-010-0268-3