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Date and Time of the Query: 2019-06-20 T14:18:31 PDT
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For refcode 2007A&A...462..547F:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2007A&A...462..547F Radio variability properties for radio sources Fan, J. H.; Liu, Y.; Yuan, Y. H.; Hua, T. X.; Wang, H. G.; Wang, Y. X.; Yang, J. H.; Gupta, A. C.; Li, J.; Zhou, J. L.; Xu, S. X.; Chen, J. L. 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. Key words: BL lacertae objects: general, quasars: general, methods: data analysis
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