Black hole spin from wobbling and rotation of the M87 jet and a sign of a magnetically arrested disc
Denis Nikolaevich Sob'yanin (LPI, MIPT)

TL;DR
This study uses long-term VLBA observations of M87's jet to analyze its wobbling behavior, suggesting a connection to black hole spin and the presence of a magnetically arrested disc, with implications for black hole angular momentum.
Contribution
It introduces a method to estimate black hole spin from jet wobbling and rotation data, indicating the possible existence of a magnetically arrested disc in M87.
Findings
Jet wobbling shows an 8-10 year quasi-periodicity.
Estimated black hole spin parameters range from 0.15 to 0.5.
Evidence supports the presence of a magnetically arrested disc.
Abstract
New long-term Very Long Baseline Array observations of the well-known jet in the M87 radio galaxy at 43 GHz show that the jet experiences a sideways shift with an approximately 8-10 yr quasi-periodicity. Such jet wobbling can be indicative of a relativistic Lense-Thirring precession resulting from a tilted accretion disc. The wobbling period together with up-to-date kinematic data on jet rotation opens up the possibility for estimating angular momentum of the central supermassive black hole. In the case of a test-particle precession, the specific angular momentum is cm, implying moderate dimensionless spin parameters and for controversial gas-dynamic and stellar-dynamic black hole masses. However, in the case of a solid-body-like precession, the spin parameter is much smaller for both masses, . Rejecting this value…
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