Optical flux and spectral characterization of the blazar PG 1553 + 113 based on the past 15 years of data
- Agarwal, Aditi
- Mihov, B.
- Andruchow, Ileana
- Cellone, Sergio Aldo
- Anupama, G. C.
- Agrawal, V.
- Zola, S.
- Özdönmez, Aykut
- Ege, Ergün
DOIAbstract
We study flux and spectral variability of the high energy peaked TeV blazar PG 1553 + 113 on diverse timescales using the data collected from 2005 to 2019 which also includes the intensive intra-night monitoring of the target. Additionally, we recorded the brightest flare of the blazar PG 1553 + 113 during April 2019 when the source attained an R-band magnitude of 13.2. Analyzing the spectral evolution of the source during the flare gave a clockwise spectral hysteresis loop and a time lag with V-band variations leading to the R-band ones. Various statistical tests, fitting procedures and cross-correlation techniques are applied to search for periodicity and examine the color-magnitude relationship. We find a median period of (2.21 ± 0.04) y...
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