NGC 4449とは 意味・読み方・使い方

NGC 4449 (also known as Caldwell 21) is an irregular galaxy in the constellation Canes Venatici. It is located about 12 million light-years away, part of the M94 Group (the Canes Venatici I Group), a galaxy group relatively close to the Local Group containing the Milky Way. The well-studied galaxy is similar in size, and often compared to, the Milky Way's satellite galaxy, the Large Magellanic Cloud (LMC). NGC 4449 has a general bar shape, also characteristic of the LMC, with scattered young blue star clusters. Near the bottom (of the Hubble photo) is the pinkish glow of atomic hydrogen gas, the telltale tracer of massive star forming regions. Interactions with nearby galaxies are thought to have influenced star formation in NGC 4449.