Transient QPOs of Fermi-LAT blazars with Linearly Multiplicative Oscillations

Abstract

We present a study on the detection and characterization of transient quasi-periodic oscillations (QPOs) in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mi>γ</mml:mi> </mml:math> -ray emission of blazars 4C +31.03, MG1 J123931+0443, and PKS 1622–253. Using light curves derived from Large Area Telescope data, we investigate oscillatory patterns characterized by periodic multiplicative amplitudes that vary linearly over time. By segmenting the light curves into increasing and decreasing trends, we analyze each segment independently, allowing for precise measurements of both the periodicity and long-term variations. To interpret these QPOs, we explore various theoretical scenarios that could explain their origin and underlying physical mechanisms. The estimated periods for blazars MG1 J123931+0443 and PKS 1622$-$253 are consistent with precessional dynamics expected in binary supermassive black hole systems, although our current results do not allow for a definitive conclusion.

Affiliated Institutions

• ORCID US
• Clemson University US

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