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Radio variability properties for sources at multi-frequencies

Published online by Cambridge University Press:  01 July 2007

Y. Liu ,
J. H. Fan  and
H. G. Wang
Y. Liu
Affiliation:
Center for Astrophysics, Guangzhou University, Guangzhou 510006, China email: [email protected]
J. H. Fan
Affiliation:
Center for Astrophysics, Guangzhou University, Guangzhou 510006, China email: [email protected]
H. G. Wang
Affiliation:
Center for Astrophysics, Guangzhou University, Guangzhou 510006, China email: [email protected]
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Abstract

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Using three radio databases of the university of Michigan Radio Astronomy Observatory (UMRAO), the National Radio Astronomy Observatory (NRAO), and the Metsähovi Observatory, we analyzed the radio light curves by the power spectral analysis and CLEANest method in search for possible periodicity. Multiple periods are found in some sources at multi-frequencies. We adopted the wavelets for period analysis of unevenly sampled time series to search for the evolution of the parameters (period, amplitude) of possible periodicities. Some possible variation of these parameters are found.

Keywords

galaxies: blazars – radio continuum – general methods: data analysis
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S245: Formation and Evolution of Galaxy Bulges , July 2007 , pp. 251 - 252
Copyright
Copyright © International Astronomical Union 2008

References

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