軒轅和矮星系
Regulus and the Dwarf Galaxy

來源:Markus Horn|發表日期:2024-04-26
北半球的春天,明亮的軒轅星很容易在東方地平線上被發現。作為獅子座的α星,軒轅星是這一望遠鏡視場中心的尖星。軒轅星距離我們只有 79 光年,是一顆炙熱、快速旋轉的恆星,是已知的多恆星系統的一部分。獅子座 I 是一個矮球狀星系,是以銀河系和仙女座星系(M 31 )為主的本星系群的成員。獅子座 I 距銀河系約 80 萬光年,被認為是圍繞銀河系執行的已知小型衛星星系中最遙遠的一個。但是矮星系獅子座一的中心有證據顯示存在一個超大質量黑洞,其質量與銀河系中心的黑洞相當。
原文:In northern hemisphere spring, bright star Regulus is easy to spot above the eastern horizon. The alpha star of the constellation Leo, Regulus is the spiky star centered in this telescopic field of view. A mere 79 light-years distant, Regulus is a hot, rapidly spinning star that is known to be part of a multiple star system. Not quite lost in the glare, the fuzzy patch just below Regulus is diffuse starlight from small galaxy Leo I. Leo I is a dwarf spheroidal galaxy, a member of the Local Group of galaxies dominated by our Milky Way Galaxy and the Andromeda Galaxy (M31). About 800 thousand light-years away, Leo I is thought to be the most distant of the known small satellite galaxies orbiting the Milky Way. But dwarf galaxy Leo I has shown evidence of a supermassive black hole at its center, comparable in mass to the black hole at the center of the Milky Way.
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