Photometric variability of BL Lacertae and 1ES 1426+428 blazars in the optical and gamma ranges
Heading:
| Izviekova, ІО, 1Ponomarenko, VA, Pulatova, NG, 2Vasylenko, VV, Simon, АО 1Astronomical Observatory of Taras Shevchenko National University of Kyiv, Kyiv, Ukraine 2Taras Shevchenko National University of Kyiv, Kyiv, Ukraine |
| Kinemat. fiz. nebesnyh tel (Online) 2022, 38(6):59-78 |
| https://doi.org/10.15407/kfnt2022.06.059 |
| Language: Ukrainian |
Abstract: We present the results of photometric observations of two bright blazars of the northern hemisphere, BL Lacertae and 1ES 1426+428, in BVRI filters of the Johnson/Bessel system, which took place during 2018—2020. Observations were performed on 2 telescopes: AZT-8, an observation station “Lisnyky” of the Astronomical Observatory of the Taras Shevchenko National University of Kyiv (Kyiv region, Ukraine) and Zeiss-600 of the Mountain Observatory “Peak Terskol” of the International Center for Astronomical, Medical and Ecological Research (IC AMER) of the National Academy of Sciences of Ukraine. In total, more than 60 nights of observations were obtained and processed. The main task was to perform cross-matching analysis of blazar light curves in BVRI bands to detect short-term (STV) and long-term (LTV) variability and to investigate the chromaticity of color parameters. For both objects, fluctuations of brightness in 2018—2020 up to 1m were recorded in BVRI bands of the Johnson/Bessel system with a total error of 0.03m—0.1m. The intraday variability (IDV) was revealed for BL Lacertae 17/18.11.2018. During calculations of the color indices, we found the trend of bluish color with increasing brightness (BWB — bluer-when-brighter). For BL Lacertae in LTV was reliably revealed by using different pairs of filters. Also, the BWB trend with an average correlation (over 0.5) was recorded for 1ES 1426+428. The presence of such fluctuations in the color of blazars is due to the synchrotron radiation of the jet. The revealed partial correlation of variations in brightness with low time resolution (more than a week) between the photometric optical observations obtained by us and the data of the Fermi gamma-ray telescope in 2018—2020 requires additional research. |
| Keywords: active galaxy nuclei (AGN), brightness, color indexes, UBVRI photometry |
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