Comment mesurer la masse d'un trou noir supermassif ? Jusqu'à présent, les astrophysiciens se fondaient sur des paramètres très indirects comme les signatures spectrales produites dans le disque d'accrétion ou la structure de la galaxie hôte entourant le trou noir. Une méthode plus directe est l'imagerie de l'ombre de l'horizon, mais elle n'a pu être obtenue que sur M87* par l'EHT. Aujourd'hui, des chercheurs américains proposent une toute nouvelle méthode très efficace, fondée sur le suivi dans le temps des variations de luminosité du disque d'accrétion. Leur étude A characteristic optical variability time scale in astrophysical accretion disks est parue hier dans la revue Science.
Emissions
- Ça Se Passe Là-Haut
- #1206 : Une nouvelle méthode efficace pour mesurer la masse des trous noirs
Publié le par eric simon
Eric Simon
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