Probable low-frequency quasi-periodic oscillations in blazars from the ZTF survey - INSPIRE

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Probable low-frequency quasi-periodic oscillations in blazars from the ZTF survey

Oct 13, 2022

15 pages

Published in:

Mon.Not.Roy.Astron.Soc. 526 (2023) 4, 5172-5186

Published: Oct 20, 2023

e-Print:

2210.07266 [astro-ph.GA]

DOI:

10.1093/mnras/stad3056

View in:

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Abstract: (Oxford University Press)

We investigate the possible presence of quasi-periodic oscillation (QPO) signals in 2103 blazars from the Zwicky Transient Facility (ZTF) time-domain survey. We detect a low-frequency QPO signal in five blazars observed over these 3.8-yr-long optical r-band ZTF light curves. These periods range from 144 to 196 d detected at ≳4σ significance levels in both the Lomb–Scargle periodogram and weighted wavelet Z-transform analyses. We find consistent results using the phase dispersion minimization technique. A similar peak is detected in the g-band light curves at a slightly lower significance of 3σ. Such nearly periodic signals on these time-scales in optical wavebands most likely originate from a precessing jet with high Lorentz factor, closely aligned to the observer’s line of sight or the movement of plasma blobs along a helical structure in the jet.

Note:

Submitted to MNRAS, 15 pages, 10 figures, 2 tables

galaxies: active
galaxies: jets
quasars: general

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