Wavelet analysis of a large sample of AGN at high radio frequencies

Details Wavelet analysis of a large sample of AGN at high radio frequencies Wavelet analysis of a large sample of AGN at high radio frequencies

2008-07-11

arxiv.org/abs/0807.1796v1

Astronomy and Astrophysics

Astrophysics

14 pages, 10 figures, A&A in press

Scientific paper

10.1051/0004-6361:200810200

We have studied the characteristic timescales of 80 AGNs at 22, 37 and 90 GHz examining the properties of the wavelet method and comparing them to traditional Fourier-based methods commonly used in astronomy. We used the continuous wavelet transform with the Morlet wavelet to study the characteristic timescales. We also gain information when the timescale is present in the flux curve and if it is persistent or not. Our results show that the sources are not periodic and changes in the timescales over a long time are common. The property of wavelets to be able to distinguish when the timescale has been present is superior to the Fourier-based methods. Therefore we consider it appropriate to use wavelets when the quasi-periodicities in AGNs are studied.

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