Published January 1, 2022
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Optical flux and spectral characterization of the blazar PG 1553+113 based on the past 15 years of data
Creators
- 1. Raman Res Inst, CV Raman Ave, Sadashivanagar 560080, Bengaluru, India
- 2. Indian Inst Astrophys, Block 2, Bangalore 560034, Karnataka, India
- 3. RMZ Ecoworld, Bellandur, Bangalore 560103, Karnataka, India
- 4. Ataturk Univ, Fac Sci, Dept Astron & Space Sci, Erzurum, Turkey
- 5. Istanbul Univ, Fac Sci, Dept Astron & Space Sci, TR-34116 Istanbul, Turkey
Description
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) years along with the secondary period of about 210 days. Finally, we briefly discuss various physical mechanisms which are capable of explaining our findings.
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