Object Analysis

The Leo I Dwarf is a dwarf spheroidal galaxy in the constellation Leo. It is one of the most distant satellite galaxies of the Milky Way, located about 820,000 light-years away. It is often difficult to observe because it is positioned just 12 arcminutes away from the extremely bright star Regulus, which washes out the faint galaxy in many telescopes.

Leo I is composed primarily of older, metal-poor stars, typical of dwarf spheroidal galaxies. However, recent studies have shown that it surprisingly experienced a burst of star formation about 2 billion years ago. This suggests that even "quiet" dwarf galaxies can have late-stage growth spurts, possibly triggered by a past close approach to the Milky Way.

At the center of Leo I, astronomers have detected evidence of a supermassive black hole with a mass of about 3 million Suns—nearly as large as the black hole at the center of the Milky Way. This discovery was unexpected for such a small galaxy and has forced a re-evaluation of how black holes and dwarf galaxies co-evolve.