Optical Photometrical Observations and Variability for Quasar 4C 29.45

Abstract

We reported the result of long term optical variability of the blazar 4C 29.45 (QSO 1156+295, Ton 599), carried out optical photometric observations in Johnson V, Cousins RI passbands during April 1997 to March 2002 using the 1.56 meter telescope of the Shanghai Astronomical Observatory (SHAO) at Sheshan, China, compiled the post-1974 optical photometric data of the blazar by combining our new observations with the published optical data, and found maximum variations in different passbands: $\Delta$U = 4.41 mag, $\Delta$B = 5.55 mag, $\Delta$V = 4.53 mag, $\Delta$R = 5.80 mag, and $\Delta$I = 5.34 mag. The average color indices are: U$-$B = $-0.54\pm$0.18 mag, B$-$V = 0.56$\pm$0.21 mag, B$-$R = 0.93$\pm$0.18 mag, B$-$I = 1.51$\pm$0.24 mag, V$-$R = 0.44$\pm$0.15 mag and V$-$I = 1.03$\pm$0.23 mag. The post-1974 data give us an excellent opportunity to search for the existence of possible periodicity in the light curve. In search for periodicity in the R passband light curve, we performed Jurkevich test and power spectral (Fourier) analysis methods, and CLEANest algorithms to remove false signals. We found possible periods of 3.55 and 1.58 years. The possible mechanism for the periodic variability was discussed.

12 pages, 9 figures, 5 tables; PASJ in press

References in corpus (6)

• Multi-colour optical monitoring of eight red blazars
• On the geometrical origin of periodicity in blazar-type sources
• A relativistic helical jet in the gamma-ray AGN 1156+295
• The binary black hole scenario for the BL Lacertae object AO 0235+16
• Optical Monitoring of PKS 1510-089: A Binary Black Hole System?
• Radio-optical flux behavior and spectral energy distribution of the intermediate blazar GC 0109+224

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• The Variability and Period Analysis for the BL Lac AO 0235+164
• Optical Monitoring of 3C 390.3 from 1995 to 2004 and Possible Periodicities in the Historical Light Curve
• Temporal variability and estimation of jet parameters for Ton 599
• Emission Line Variability during a Nonthermal Outburst in the Gamma-Ray Bright Quasar 1156+295
• Optical Monitoring of the Seyfert Galaxy NGC 4151 and Possible Periodicities in the Historical Light Curve
• Catching profound optical flares in blazars
• Long-term optical and radio variability of BL Lacertae
• Study of variability in long-term multiwavelength optical lightcurves of blazar AO 0235+164
• Multiband optical variability on diverse timescales of the blazar Ton 599 from 2011 to 2023
• First detection of VHE gamma-ray signal from the FSRQ TON 0599
• Multiple periodic oscillations in the radio light curves of NRAO 530
• Shortterm optical variability of 4C 29.45