• Yu-Ying Bao

      Articles written in Journal of Astrophysics and Astronomy

    • Broad-Band Spectral Indices Variability of BL Lacertae by Wavelet Method

      Hao-Jing Zhang Jing-Ming Bai Yu-Ying Bao Xiong Zhang

      More Details Abstract Fulltext PDF

      BL Lacertae is one of the famous AGN that shows convincing evidence to support periodic variability. We compile R-band data and radio 22 GHz database from the available literature to build the light curves and to calculate broad-band spectral indices. This paper employs the wavelet periodic estimation method. The analysis results indicate that the most possible period is 7.02–7.36 yr in the selected wave-bands. The broad-band spectral indices have a possible period of 4.11 yr as a half value in selected wave-bands. The results confirm that the variability period in the radio 22 GHz is in agreement with the optical R band of about 7.01 yr, as also mentioned in other literatures.

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