UGC 8320とは 意味・読み方・使い方

UGC 8320 is a dwarf irregular galaxy located in the constellation Canes Venatici. The galaxy measures approximately 4 × 1.5 kiloparsecs (13,000 × 4,900 lightyears) and has a large number of H II regions scattered across most of the observable face. Nearly all of the resolvable stars above magnitude 19.5 are blue giants of class O or B and the entire galaxy has a distinct blue appearance when viewed in visible light, suggesting that it is in a state of vigorous star formation. A majority of the H II regions and associated blue giants are concentrated in a band extending from the center of the galaxy to the upper-right end of the disc when viewed from our vantage point on Earth. Another large cluster of stars is located at the lower-left end of the galaxy and a third is located directly below the center though the latter does not appear to be associated with any H II regions.