Abstract PG 1553+ 113 is a well-known blazar exhibiting evidence of a∼ 2.2 yr
quasiperiodic oscillation (QPO) in the radio, optical, X-ray, and γ-ray bands. Since QPO …

Using grid-based hydrodynamics simulations and analytic modeling, we compute the
electromagnetic (EM) signatures of gravitational wave (GW) driven inspirals of massive …

A 2.1 yr periodic oscillation of the gamma-ray flux from the blazar PG 1553+ 113 has
previously been tentatively identified in∼ 7 yr of data from the Fermi Large Area Telescope …

Blazars present highly variable gamma-ray emission. This variability, which can range from
a few minutes to several years, is also observed at other wavelengths across the entire …

We examine lengthy radio light curves of the flat spectrum radio galaxy 3C 454.3 for
possible quasiperiodic oscillations (QPOs). The data used in this work were collected at five …

The search for periodicity in the multiwavelength, highly variable emission of blazars is a key
feature to understanding dynamical processes at work in this class of active galactic nuclei …

The blazar PG 1553+ 113 is hypothesized to harbor a supermassive black hole binary
system, a scenario that aligns with its observed physical characteristics. In this study, we re …

A majority of blazars exhibit variable emission across the entire electromagnetic spectrum,
observed over various time scales. In particular, discernible periodic patterns are detected in …

In our recent investigation, we utilized a century's worth of archival optical data to search for
a decade-long periodicity from the blazar PG 1553+ 113, finding a hint of a 22-year period …

In this thesis, a model for interpreting quasi-periodic signatures originating from
supermassive binary black hole inspirals at the cores of blazars and caused by jet …