Agarwal, Aditi ; Mihov, B. ; Andruchow, I. ; Cellone, Sergio A. ; Anupama, G. C. ; Agrawal, V. ; Zola, S. ; Özdönmez, Aykut ; Ege, Ergün (2022) Optical flux and spectral characterization of the blazar PG 1553 + 113 based on the past 15 years of data Journal of Astrophysics and Astronomy, 43 (1). ISSN 0250-6335
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Official URL: http://doi.org/10.1007/s12036-021-09793-5
Related URL: http://dx.doi.org/10.1007/s12036-021-09793-5
Abstract
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.
Item Type: | Article |
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Source: | Copyright of this article belongs to Springer Nature |
Keywords: | Active galaxies, BL Lacertae objects, PG 1553 + 113 |
ID Code: | 130573 |
Deposited On: | 01 Dec 2022 10:53 |
Last Modified: | 01 Dec 2022 10:53 |
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