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Fórum ExoSpace.cz • Zobrazit téma - Hydrus-1 – Další trpasličí souputník naší Galaxie
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Hydrus-1 – Další trpasličí souputník naší Galaxie

PříspěvekNapsal: 20. kvě 2018, 22:32
od Jakub Hadač
Vědci z univerzity Carnegie Mellon v Pensylvánii v USA objevili novou ultraslabou satelitní galaxii, Hydrus-1. Tato malinká eliptická galaxie obíhá kolem naší Galaxie ve vzdálenosti 90.000 světelných let od Slunce. Zřejmě je součástí Magellanova proudu.

Hydrus-1 obíhá Mléčnou dráhu ve vzdálenosti 90.000 světelných let od Slunce a 78.000 světelných let od Velkého Magellanova mračna. Nachází se v souhvězdí Malého vodního hada (lat. Hydrus). V průměru má 326 světelných let, což je na galaxii velmi málo. Naopak vysoký je poměr hmotnosti/svítivosti je 66, a to i na ultraslabou galaxii. Důsledkem toho má Hydrus-1 jasnost pouhých 12,5 mag a absolutní -4,7 mag. Právě nízká jasnost galaxie způsobila, že unikala tak dlouho odhalení. Galaxie má mírně protáhlý elipsoidální tvar, jeví charakter protáhlé kulové hvězdokupy, obsahuje i velké množství temné hmoty.



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