BX44
Sign in to saveBX442 (Q2343-BX442) is a grand design spiral galaxy of type Sc. It has a companion dwarf galaxy. It is the most distant known grand design spiral galaxy in the universe, with a redshift of z=2.1765 ± 0.0001. It is commonly referred to as the oldest known grand design spiral galaxy in the universe,
Key facts
- Galaxy.appmag_v
- 24.4R
- Galaxy.name
- Q2343-BX442
- Galaxy.image
- 250px
- Galaxy.caption
- BX442 (Hubble Legacy Archive)
- Galaxy.epoch
- J2000
- Galaxy.constellation name
- Pegasus
- Galaxy.size_v
- 0.015 x 0.01 moa
- Galaxy.type
- Sc
- Galaxy.size
- ~50 kly (diameter)
- Galaxy.dist_ly
- (light travel distance) (present proper distance)
- Galaxy.names
- HB89 2343+125 BX442, PGC 4668406, SSTSL2 J234619.33+124759.4
via Wikipedia infobox
Article
4 sectionsContents
- Galaxy
- See also
- References
- External links
BX442 (Q2343-BX442) is a grand design spiral galaxy of type Sc. It has a companion dwarf galaxy. It is the most distant known grand design spiral galaxy in the universe, with a redshift of z=2.1765 ± 0.0001. It is commonly referred to as the oldest known grand design spiral galaxy in the universe, but it is more accurately the earliest such galaxy known to exist in the universe, with a lookback time (the difference between the age of the universe now and the age of the universe at the time light left the galaxy) of 10.7 billion years in the concordance cosmology. This time estimate means that structure seen in BX442 developed roughly 3 billion years after the Big Bang. It is 15 kiloparsecs (50 kly) in diameter, and has a mass of .
==Galaxy== The spiral morphology of BX442, while similar to many modern-day galaxies, makes it unusual in the young universe. According to study co-author Alice E. Shapley of UCLA, "The vast majority of old galaxies look like train wrecks. Our first thought was, why is this one so different, and so beautiful?"