MACS1149-JD1
High-redshift galaxy in the constellation Leo
From Wikipedia, the free encyclopedia
MACS1149-JD1 (also known as JD1 and PCB2012 3020) is a young galaxy that is known for being one of the farthest known galaxies from Earth. It was discovered in 2014 and confirmed in 2018.[6] The JD1 galaxy is at a redshift of about z=9.11,[1] or about 13.28 billion ly (4.07 billion pc) away from Earth meaning that it formed when the universe was around 500 million years old.[4][7]
| MACS1149-JD1 | |
|---|---|
Hubble and ALMA image of galaxy cluster MACS J1149.5+2223 with an inset of MACS1149-JD1 | |
| Observation data (J2000 epoch) | |
| Constellation | Leo |
| Right ascension | 11h 49m 33.584s |
| Declination | +22° 24′ 45.78″ |
| Redshift | 9.1096±0.0006[1] |
| Heliocentric radial velocity | 2878008±59958 km/s[2] |
| Distance | 29.99 Gly (9.195 Gpc)[3] (co-moving) 13.28 Gly (4.07 Gpc)[4] (light travel) |
| Group or cluster | MACS J1149.5+2223 |
| Apparent magnitude (V) | 26.8[3] |
| Characteristics | |
| Type | Dwarf |
| Mass | 1.1+0.5 −0.2×109[1] M☉ |
| Size | 3,000 ly (diameter) |
| Apparent size (V) | 0.00075 x 0.00035 |
| Other designations | |
| [PCB2012] 3020, [KOI2016] HFF4C-YJ1, [ZZI2017] 663[5] | |
The carbon and neon abundances of JD1 are below the solar abundance ratio. The under-abundance of carbon suggests recent star formation where a Type II supernova enriched the interstellar medium (ISM) with oxygen, but intermediate mass stars have not yet enriched the ISM with carbon.[8]
Due to a lack of old population stars detected, JD1 is probably a young galaxy.[8]
We are able to see this galaxy because of the gravitational lensing caused by the MACS J1149.5+2223 Galaxy Cluster.
