The Detection of Possible Transient Quasiperiodic Oscillations in the γ-Ray Light Curve of PKS 0244-470 and 4C+38.41

Abstract The continuous monitoring capability of Fermi-LAT has enabled the exploration quasiperiodic oscillations (QPOs) in γ -ray light curve blazars that given a new perspective to probe these sources over wide range timescales. We report presence transient QPOs long-term PKS 0244-470 and 4C +38.41. first identified different flux states using Bayesian block algorithm then explored possible segments each phase where level changes fairly regular intervals. Combining this with source’s intrinsic variance, we two phases for 0244-470: one activity (AP-1) quiescent (QP-1). For 4C+38.41, similarly four (AP-1, AP-2, AP-3, AP-4) (QP-1 QP-2) phases. AP-1 shows QPO ∼225 days persisting eight cycles (∼4.1 σ ). In AP-2 show QPO-like behavior ∼110 ∼60 days, respectively, five cycles. three subphases, all ∼7 day scale recurrent rise complete cycles, while QP-1, could identify subphases (Q1 Q2). Q1 period ∼104 six Q2 also but only ∼3.7 discuss origin argue current-driven kink instability curved jet model seem be most likely causes shorter longer QPOs.