http://arxiv.org/abs/1611.04354
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 a significant quasi-periodicity in gamma-ray flux is found, with a period of $1.74\pm0.13$ years and a significance of 4.9 $\sigma$.
P. Zhang, D. Yan, N. Liao, et. al.
Tue, 15 Nov 16
14/86
Comments: 5 pages, 3 figures, submitted to ApJ
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