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Intraday Optical Multiband Observation of BL Lacertae

  • Authors: Yue Fang, Yan Zhang, Qihang Chen, and Jianghua Wu

2022 The Astrophysical Journal 926 91.

  • Provider: AAS Journals

Caption: Figure 7.

Examples of lags measured with three methods on JD 2,458,745. The left, center, and right panels represent the VR, VI, and RI lags, respectively. The measured lags and uncertainties are given in all panels and are indicated by the solid and dotted lines, respectively. Top panels: the discrete correlation coefficient (points) and the likelihood (curves) obtained from ZDCF and PLIKE, respectively. Bottom two rows: the CCCD and PD obtained from PyCCF and JAVELIN, respectively. The dashed lines indicate the KDE of the weighted CCCD/PD and the histograms are the unweighted CCCD/PD. The shaded regions highlight the ranges of lags included in the final calculation.

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