Radio variability properties for radio sources

Abstract

In this paper, we used the database of the university of Michigan Radio Astronomy Observatory (UMRAO) at three (4.8 GHz, 8.0 GHZ, and 14.5 GHz) radio frequency to analyze the radio light curves by the power spectral analysis method in search of possible periodicity. The analysis results showed that the radio sources display astrophysically meaningful periodicity ranging from 2.2 to 20.8 years in their light curves at the three frequencies. We also calculated the variability parameters and investigated the correlations between the variability parameter and the flux density. For the variability parameters, we found that the parameters at higher frequency are higher than those in the lower frequency. In addition, the variability parameters of BL Lacertae objects are larger than those of flat-spectrum radio quasars. suggesting that they are more variable than flat spectrum radio quasars.

28 pages, 6 figures, 3 tables, A&A in press

References in corpus (8)

• Optical and radio behaviour of the BL Lacertae object 0716+714
• Optical and radio variability of the BL Lac object AO 0235+16: a possible 5-6 year periodicity
• Multiwavelength observations of short time-scale variability in NGC 4151. IV. Analysis of multiwavelength continuum variability
• Historic Light Curve and Long-term Optical Variation of BL Lacertae 2200+420
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Cited by in corpus (29)

• Optical Intra-day Variability in Blazars
• The optical microvariability and spectral changes of the BL Lacertae object S5 0716+714
• A spinning supermassive black hole binary model consistent with VLBI observations of the S5 1928+738 jet
• Multi-color Near Infra-red Intra-day and Short Term Variability of the Blazar S5 0716+714
• Transient Quasi-Periodic Oscillations at $\gamma$-rays in the TeV Blazar PKS 1510-089
• Quasi-Periodic Oscillations in the long term radio light curves of the blazar AO 0235+164
• Very Long Baseline polarimetry and the gamma-ray connection in Markarian 421 during the broadband campaign in 2011
• Spectral Variability of Radio Sources at Low Frequencies
• Intra-day variability observations of S5 0716+714 over 4.5 years at 4.8 GHz
• Optical monitoring of BL Lac object S5 0716+714 and FSRQ 3C273 from 2000 to 2014
• A Possible 3-Year Quasi-Periodic Oscillation in γ-Ray Emission from the FSRQ S5 1044+71
• The Variability and Period Analysis for the BL Lac AO 0235+164
• Radio spectral index from NVSS and TGSS
• 3C273 variability at 7 mm: Evidences of shocks and precession in the jet
• Detection of a high-confidence quasi-periodic oscillation in radio light curve of the high redshift FSRQ PKS J0805-0111
• A kinematic study of the compact jet in quasar B3 1633+382
• Optical Monitoring of 3C 390.3 from 1995 to 2004 and Possible Periodicities in the Historical Light Curve
• Tracing the merger-driven evolution of active galaxies using the CJF sample
• Deconstructing blazars: A different scheme for jet kinematics in flat-spectrum AGN
• Correlations between the peak flux density and the position angle of inner-jet in three blazars
• Multiwavelength variability of the blazar AO 0235+164
• Multiwavelength analysis and the C IV λ1549 Å emission line behavior from 2008 to 2020 of the FSRQ B2 1633+382
• Revisiting radio variability of the blazar 3C 454.3
• No strong radio absorption detected in the low-frequency spectra of radio-loud quasars at z > 5.6
• The detection of possible $\gamma$-ray quasi-periodic modulation with $\sim$600 days from the blazar S2 0109+22
• Strong gravitational lensing with upcoming wide-field radio surveys
• Radio properties of high-redshift galaxies at $z\ge 1$
• Multiple periodic oscillations in the radio light curves of NRAO 530
• Parsec-scale jet precession and a putative supermassive binary black hole system in the blazar AO 0235+164