Constraining the PG 1553+113 binary hypothesis: interpreting hints of a new, 22-year period

Sagar Adhikari, Pablo Penil, John Ryan Westernacher-Schneider +5

PG 1553+113 is a well-known blazar exhibiting evidence of a $\sim 2.2$-yr quasi-periodic oscillation (QPO) in radio, optical, X-ray, and $\gamma$-ray bands. Since QPO mechanisms often…