Speaker
Description
Based on the high cadence X-ray monitoring of a flare coming from the nucleus of a galaxy located cca 250 Mpc away and discovered by ASASSN in December 2020, the existence of ultra-fast outflows in the source was revealed. The outflows were quasiperiodically launched from near the SMBH with variable column density and ionization, but constant velocity, for more than three months. We interpret the observed phenomenon as outflows induced by an object periodically transiting through the accretion flow onto the SMBH. Such scenario is supported by our GRMHD simulations of stellar transits through accretion disc. The strength of the outflow suggests large influence radius of the perturber, hence indicating it to be an intermediate-mass black hole rather than a usual star.
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