http://arxiv.org/abs/2206.02129
We report the case of optical periodic modulation discovered in two Active Galactic Nuclei (AGN) and one candidate AGN. Analyzing the archival optical data obtained from large transient surveys, namely the Catalina Real-Transient Survey (CRTS) and the Zwicky Transient Facility (ZTF), we find the periodicities of 2169.7, 2103.1, and 1462.6\,day in the sources J0122+1032, J1007+1248 (or PG~1004+1248), and J2131$-$1127 respectively. The optical spectra of the first two indicate that the first is likely a blazar and the second a type 1 Seyfert galaxy, and while no spectroscopic information is available for the third one, its overall properties suggest that it is likely an AGN. In addition, mid-infrared (MIR) light curve data of the three sources, taken by the Wide-field Infrared Survey Explorer (WISE), are also analyzed. The light curves show variations, which may possibly be related to the optical periodicities. Based on the widely-discussed super-massive black hole binary (SMBHB) scenario, we discuss the origin of the optical modulation as well as the MIR variations. Two possible interesting features, an additional 162-day short optical periodicity in J2131$-$1127 and the consistency of the X-ray flux variations of J1007+1248 with its optical periodicity, are also discussed within the SMBHB scenario.
J. Li, Z. Wang and D. Zheng
Tue, 7 Jun 22
27/70
Comments: 9 pages, 6 figures, 5 tables, submitted to MNRAS
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