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Star-induced Nuclear Quasiperiodic Variability: Case of Swift J0230+28

Presentation #102.07 in the session AGN Posters.

Published onMay 03, 2024
Star-induced Nuclear Quasiperiodic Variability: Case of Swift J0230+28

Supemassive black holes (SMBHs) in galactic nuclei are generally surrounded by a dense cluster of stars, some of which can orbit close enough to the SMBH to inluence its accretion rate. Here we study whether the quasiperiodic soft X-ray eruptions exhibited by Swift J0230+28 (Evans+23, Guolo+23) can be addressed by an orbiting star. The constraints on the SMBH mass in this source and the eruption period of about 22 days suggest that in case the flares are driven by the Roche-lobe overflow, the star should be evolved with a radius of ~30 Solar radii. In addition, we also discuss complementary scenarios involving stars, specifically repetitive star-disc crossings, an oscillating shock due to incoming low angular-momentum material from stellar winds, and two coorbiting stars.

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