A repeating X-ray signal with a period of about 28 minutes is claimed in two independent observations of NGC 4151, with uncorrected combined significance 5.2 sigma that falls to 3.2 sigma under the paper's strictest trial correction.
Revisiting Quasi-Periodic modulation in $\gamma$-ray Blazar PKS 2155-304 with Fermi Pass 8 data
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abstract
We examine the gamma-ray quasi-periodic variability of PKS 2155-304 with the latest publicly available \emph{Fermi}-LAT Pass 8 data which covers the years from 2008 August to 2016 October. We produce the light curves in two ways, i.e., the exposure-weighted aperture photometry and the maximum likelihood optimization. The light curves are then analyzed by using Lomb-Scargle Periodogram (LSP) and Weighted Wavelet Z-transform (WWZ); and the results reveal a significant quasi-periodicity with a period of $1.74\pm0.13$ years and a significance of $\sim$ 4.9 $\sigma$. The constraint of multifrequencies quasi-periodic variabilities on blazar emission model is discussed.
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Detection and Characterization of Quasi-Periodic Oscillations in Seyfert Galaxy NGC 4151
A repeating X-ray signal with a period of about 28 minutes is claimed in two independent observations of NGC 4151, with uncorrected combined significance 5.2 sigma that falls to 3.2 sigma under the paper's strictest trial correction.