高射频下大样本AGN的小波分析
Wavelet analysis of a large sample of AGN at high radio frequencies
摘要：
我们已经研究了80 AGN在22，37和90 GHz的特征时间尺度检查小波方法的属性，并将其与传统的傅立叶方法在天文学中常用的。我们使用连续小波变换与Morlet小波研究的特征时间尺度。我们还获得信息时，时间尺度是目前在流量曲线，如果它是持久的或不。我们的研究结果表明，源不是周期性的，在很长一段时间内的时间尺度的变化是常见的。小波的属性，能够区分时间尺度时，已经存在的是优于基于傅立叶的方法。因此，我们认为在研究活动星系核的准周期性时，使用小波是合适的。
英文摘要：
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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