Table 9.
Significance values of the observed periods using either the local or the global method with respect to the monthly and weekly γ-ray light curves of PG 1553+113 and PKS 0447−489, respectively.
| Source | Simulation | Monthly |
Weekly |
||||
|---|---|---|---|---|---|---|---|
| algorithm | PSD-slope | Local | Global | PSD-slope | Local | Global | |
| βm | significance | significance | βw | significance | significance | ||
| PG 1553+113 | Timmer & Koenig | βmin = 0.75 | 5.33σ | 2.46σ | βmin = 0.55 | 5.32σ | 3.06σ |
| ⟨βm⟩ = 0.88 | 3.89σ | 2.14σ | ⟨βw⟩ = 0.66 | 3.70σ | 2.07σ | ||
| βmax = 1.01 | 3.72σ | 1.86σ | βmax = 0.77 | 2.90σ | 0.93σ | ||
| Emmanoulopoulos | βmin = 0.76 | 5.33σ | 2.40σ | βmin = 0.56 | 5.32σ | 3.10σ | |
| ⟨βm⟩ = 0.90 | 3.89σ | 2.06σ | ⟨βw⟩ = 0.67 | 3.83σ | 2.16σ | ||
| βmax = 1.04 | 3.48σ | 1.75σ | βmax = 0.78 | 2.79σ | 0.79σ | ||
| PKS 0447−439 | Timmer & Koenig | βmin = 0.91 | 3.12σ | 1.06σ | βmin = 0.66 | 3.32σ | 1.74σ |
| ⟨βm⟩ = 1.06 | 2.87σ | 1.00σ | ⟨βw⟩ = 0.79 | 3.02σ | 1.28σ | ||
| βmax = 1.21 | 2.67σ | 0.46σ | βmax = 0.92 | 2.53σ | 0.64σ | ||
| Emmanoulopoulos | βmin = 0.94 | 3.11σ | 1.04σ | βmin = 0.67 | 3.30σ | 1.69σ | |
| ⟨βm⟩ = 1.07 | 2.94σ | 1.16σ | ⟨βw⟩ = 0.80 | 3.03σ | 1.25σ | ||
| βmax = 1.20 | 2.71σ | 0.54σ | βmax = 0.93 | 2.47σ | 0.65σ | ||
Notes. The significance levels were evaluated via MC-Simulation using Timmer & Koenig (1995) and Emmanoulopoulos et al. (2013) algorithms with 50 000 trials. The mean slopes ⟨βm⟩ were obtained from fitting the γ-ray power spectra with a simple power-law model, and the corresponding success fractions were calculated based on the PSRESP method (Uttley et al. 2002). βmin and βmin represents the minimum and maximum of the 1σ error bars resulting from fitting Gaussians to each of the slope profiles.
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