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arXiv · 2304.08044

Search for X-ray Quasi-periodicity of six AGNs using Gaussian Process method

Haoyang Zhang·Shenbang Yang·Benzhong Dai
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Abstract

The quasi-periodic oscillations (QPOs) found in active galactic nuclei (AGNs) are a very interesting observational phenomenon implying an unknown physical mechanism around supermassive black holes. Several AGNs have been found to have QPO phenomena in the X-ray energy band. Long-duration X-ray observations were collected and reduced for six AGNs with a suspected QPO. The Gaussian process (GP) model celerite was used to fit the light curves and to search for the quasi-periodicity behavior. The power spectral density and parameter posterior distributions of each light curve were calculated with the optimal model. Of the six AGNs, only RE J1034+396 was found to have a QPO of about 3600 s. The other five sources do not show QPO modulation behavior. We propose that a hot spot on the accretion disk is a possible physical mechanism resulting in this quasi-periodic behavior of AGNs.

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Haoyang Zhang, Shenbang Yang, Benzhong Dai. 2023-04-17. Search for X-ray Quasi-periodicity of six AGNs using Gaussian Process method. https://doi.org/10.3847/1538-4357%2Facbe37

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