Multicolour Optical Variability Monitoring of Blazars with High Time Resolution

Abstract

We carried out a high time-resolution, multicolour optical observing campaign for eight $\gamma$-ray detected blazars during 2010-2020. We analyze flux variations, correlations between magnitudes and colours on different timescales. Intraday variability (IDV) is detected in all eight sources of our sample. A bluer-when-brighter (BWB) chromatic trend is dominant on intraday timescales. On the short timescales, the BWB trend only shows up in ON 231, 3C 279, BL Lacertae and 1E 1458.8+2249. There is a BWB trend in 3C 279 on the long timescale. We estimate the upper limits of black hole mass for three blazars (i.e. ON 321, 1ES 1426+42.8, PKS 1510-089) using variability timescales. On April 13, 2010 a potential quasi-periodic oscillation (QPO) with the period of $P=48.67\pm 13.90$ minutes is found in 1ES 1426+42.8. The light curve on March 16, 2021 further shows the existence of the QPO phenomenon. The QPO in this target deserves further observation and confirmation.

18 pages, 8 figures, accepted in MNRAS

References in corpus (15)

• Multi-colour optical monitoring of eight red blazars
• Periodic Oscillations in the Intra-day Optical Light Curves of the Blazar S5 0716+714
• Optical Intra-day Variability in Blazars
• Multi-band optical variability studies of BL Lacertae
• Radio and $\gamma$-ray variability in the BL Lac PKS 0219 -164: Detection of quasi-periodic oscillations in the radio light curve
• A Consolidated Framework of the Color Variability in Blazars: Long-Term Optical/Near-Infrared Observations of 3C 279
• The debeamed luminosity, sychrotron peak frequency and black hole mass of BL Lac objects
• Optical Monitoring of BL Lacertae Object OJ 287: a 40-Day Period?
• Multi-color Optical Variability of the TeV Blazar Mrk 501 in the Low-State
• Optical quasi-periodic oscillation of the BL Lacertae object S5 0716+714 during the faint state
• Oscillations of Thick Accretion Discs Around Black Holes
• The high energy spectrum of 3C 273
• Constraints on black hole massess with timescales of variations in blazars
• Active Galactic Nuclei: Unification, Blazar Variability and the Radio Galaxy/Cosmology Interface
• Optical Monitoring of OT 546 in 2009

Cited by in corpus (1)

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