Intraday Optical Variability of BL Lacertae

Abstract

We monitored BL Lacertae simultaneously in the optical B, V, R and I bands for 13 nights during the period 2012-2016. The variations were well correlated in all bands and the source showed significant intraday variability (IDV). We also studied its optical flux and colour behaviour, and searched for inter-band time lags. A strong bluer-when-brighter chromatism was found on the intra-night time-scale. The spectral changes are not sensitive to the host galaxy contribution. Cross-correlation analysis revealed possible time delay of about 10 min between variations in the V and R bands. We interpreted the observed flares in terms of the model consisting of individual synchrotron pulses.

arXiv comment9 pages, 7 figures, accepted by MNRAS

References in corpus (37)

• Unified Schemes for Radio-Loud Active Galactic Nuclei
• Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei. II. A Homogeneous Analysis of a Large Reverberation-Mapping Database
• A Unifying View of the Spectral Energy Distributions of Blazars
• AGN Black Hole Masses and Bolometric Luminosities
• On Uncertainties in Cross-Correlation Lags and the Reality of Wavelength-Dependent Continuum Lags in Active Galactic Nuclei
• General physical properties of bright Fermi blazars
• Turbulent, Extreme Multi-Zone Model for Simulating Flux and Polarization Variability in Blazars
• Doppler factors, Lorentz factors and viewing angles for quasars, BL Lacertae objects and radio galaxies
• Near-infrared template spectra of normal galaxies: k-corrections, galaxy models and stellar populations
• The WEBT BL Lac Campaign 2000
• Photopolarimetric Monitoring of Blazars in the Optical and Near-Infrared Bands with the Kanata Telescope. I. Correlations between Flux, Color, and Polarization
• The HST Survey of BL Lacertae Objects. I. Surface Brightness Profiles, Magnitudes, and Radii of Host Galaxies
• On the use of structure functions to study blazar variability: caveats and problems
• Rapid Variability and Annual Cycles in the Characteristic Time-scale of the Scintillating Source PKS 1257-326
• An Optical View of BL Lacertae Objects
• The awakening of BL Lacertae: observations by Fermi, Swift, and the GASP-WEBT
• Optical Intra-day Variability in Blazars
• The Outburst of the Blazar AO 0235+164 in 2006 December: Shock-in-Jet Interpretation
• Spectral Slope Variability of BL Lac Objects in the Optical Band
• Coordinated Multiwavelength Observations of BL Lacertae in 2000
• The central black hole masses and Doppler factors of the $\gamma$-ray loud blazars
• Multi-band optical variability studies of BL Lacertae
• Multi-band optical micro-variability observations of BL Lacertae
• Longterm Optical Monitoring of Bright BL Lacertae Objects with ATOM: Spectral Variability and Multiwavelength Correlations
• The 72-Hour WEBT Microvariability Observation of Blazar S5 0716+714 in 2009
• Structure and flux variability in the VLBI jet of BL Lacertae during the WEBT campaigns (1995--2004)
• The long-term optical spectral variability of BL Lacertae
• Detection of Polarimetric Variations Associated with the Shortest Time-Scale Variability in S5 0716$+$714
• Nature of Intra-night Optical Variability of BL Lacertae
• Simultaneous B'V'R' Monitoring of BL Lacertae Object S5~0716+714 and Detection of Inter-Band Time Delay
• Multi-band optical variability of the Blazar S5 0716+714 in outburst state during 2014-2015
• The stellar content of low redshift BL Lac host galaxies from multicolour imaging
• Is BL Lacertae an "orphan" AGN? Multiband and spectroscopic constraints on the parent population
• Long-term optical polarization variability of the tev blazar 1es~1959+650
• Multiband optical polarimetry of BL Lac objects with the Nordic Optical Telescope
• Short Timescale Photometric and Polarimetric Behavior of two BL Lacertae Type Objects
• Optical multi-band observations of BL Lacertae during the outburst of 2005

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• Study of correlation between optical flux and polarization variations in BL Lac objects
• Multi-wavelength Variation Phenomena of PKS 0735+178 on Diverse Timescale
• Analysis of the intra-night variability of BL Lacertae during its August 2020 flare
• Intra-day variability of BL Lacertae from 2016 to 2018
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