Multi-band behaviour of the TeV blazar PG 1553+113 in optical range on diverse timescales. Flux and spectral variations
- Agarwal, A.
- Mihov, B.
- Andruchow, Ileana
- Cellone, Sergio Aldo
- Anupama, G. C.
- Agrawal, V.
- Zola, S.
- Slavcheva Mihova, L.
- Özdönmez, A.
- Ege, E.
- Raj, A.
- Mammana, Luis Antonio
- Zibecchi, Lorena Cecilia
- Fernandez Lajus, Eduardo Eusebio
DOIAbstract
Context. The TeV BL Lac object PG1553+113 is one of the primary candidates for a binary supermassive black hole system.Aims. We study the flux and spectral variability of PG1553+113 on intra-night to long-term timescales using (i) BVRI data collected over 76 nights from January 2016 to August 2019 involving nine optical telescopes and (ii) historical VR data (including ours) obtained for the period from 2005 to 2019.Methods. We analysed the light curves using various statistical tests, fitting and cross-correlation techniques, and methods for the search for periodicity. We examined the colour-magnitude diagrams before and after the corresponding light curves were corrected for the long-term variations.Results. Our intra-night monitoring, su...
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