iflscience - Supermassive Black Hole’s Spin Measured For The First Time With Destroyed Star
Estimer le spin d'un trou noir en étudiant son "repas"
The phenomenon is known as the Lense-Thirring precession, although one cannot normally see it. Black holes do not emit light, so the precession remains invisible. That is, unless you suddenly have something that shines – like the debris of a recently deceased star. Armed with that theoretical backing and estimates for the mass of the supermassive black hole and star, they worked out that the spin of the black hole is less than one-quarter of the speed of light.
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