Detection of a quasi-periodic oscillation in gamma-ray light curve of the high-redshift blazar B2 1520+31

Author(s)

Gupta, Alok C. ^[1] ; Tripathi, Ashutosh ^{[2, 3]} ; Wiita, Paul J. ^[4] ; Kushwaha, Pankaj ^[5] ; Zhang, Zhongli ^[6] ; Bambi, Cosimo ^{[2, 3, 7]}

Affiliation

^[1] Aryabhatta Res Inst Observat Sci, ARIES, Naini Tal 263001 - India

^[2] Fudan Univ, Dept Phys, 220 Handan Rd, Shanghai 200433 - Peoples R China

^[3] Fudan Univ, Ctr Field Theory & Particle Phys, 220 Handan Rd, Shanghai 200433 - Peoples R China

^[4] Coll New Jersey, Dept Phys, POB 7718, Ewing, NJ 08628 - USA

^[5] Univ Sao Paulo, Dept Astron, IAG, BR-05508090 Sao Paulo - Brazil

^[6] Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030 - Peoples R China

^[7] Eberhard Karls Univ Tubingen, Theoret Astrophys, D-72076 Tubingen - Germany

• Document type: Journal article
• Source: Monthly Notices of the Royal Astronomical Society; v. 484, n. 4, p. 5785-5790, APR 2019.
• Web of Science Citations: 1

Abstract

We detected a possible quasi-periodic oscillation (QPO) of similar to 71 d in the 0.1-300 GeV gamma-ray Fermi-Large Area Telescope light curve of the high-redshift flat spectrum radio quasar B2 1520+31. We identify and confirm that quasi-period by Lomb-Scargle periodogram and weighted wavelet Z-transform analyses. Using this QPO period, and assuming it originates from accretion disc fluctuations at the innermost stable circular orbit, we estimate the central supermassive black hole mass to range between similar to 5.4 x 10(9) M-circle dot for a non-rotating black hole and similar to 3.4 x 10(10) M-circle dot for a maximally rotating black hole. We briefly discuss other possible radio-loud active galactic nuclei emission models capable of producing a gamma-ray QPO of such a period in a blazar. (AU)

• FAPESP's process: 15/13933-0 - Probing relativistic jets and high energy emission through Multi-wavelength observation analysis
• Grantee: Pankaj Kushwaha
• Support type: Scholarships in Brazil - Post-Doctorate