The BL Lac PG 1553+113: a supermassive binary black hole candidate

Pere Munar-Adrover, Marco Tavani, Alfonso Cavaliere, Andrea Argan

Research output: Contribution to journalArticleResearch


© 2019, Accademia Nazionale dei Lincei. We present updated observations of the blazar PG 1553+113, a bright BL Lac Object that yields quasi-periodic gamma-ray emission every 2.2 years, strongly suggesting the activity of a super-massive binary black hole. Such binary systems are widely held to emit low-frequency gravitational waves. Confirming the binary nature of PG 1553+113 is very relevant for upcoming searches of nHz gravitational waves.
Original languageEnglish
JournalRendiconti Lincei
Publication statusPublished - 1 Jan 2019


  • Active galactic nuclei
  • Astrophysics
  • Gamma rays


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