| F200DB-045 | |
|---|---|
| Observation data (J2000epoch) | |
| Constellation | Volans |
| Right ascension | 07h 23m 22.770s[1] |
| Declination | −73° 27′ 39.72″[1] |
| Redshift | 20.4[2][3] |
| Characteristics | |
| Type | Lyman-break galaxy |
F200DB-045 is a candidate high-redshiftgalaxy, with an estimatedredshift of approximately z = 20.4,[2][3] corresponding to 168 million years after theBig Bang.[4] If confirmed, it would be one of the earliest and most distant known galaxies observed.
F200DB-045 would have a light-travel distance (lookback time) of 13.7 billion years, and, due to theexpansion of the universe, apresent proper distance of 36.1 billion light-years.[4]
Nonetheless, the redshift value of the galaxy presented by the procedure in one study[2] may differ from the values presented in other studies using different procedures.[3][5]
The candidatehigh-redshiftgalaxy F200DB-045 was discovered within the data from theEarly Release Observations (ERO) that was obtained using theNear Infrared Camera of theJames Webb Space Telescope (JWST) in July 2022. This data included a nearbygalaxy clusterSMACS J0723.3–7327, a massive cluster known as a possible "cosmic telescope" in amplifying background galaxies, including the F200DB-045 background galaxy.[2][3]
Only aphotometric redshift has been determined for F200DB-045; follow-up spectroscopic measurements will be required to confirm the redshift (seespectroscopic redshift). Spectroscopy could also determine the chemical composition, size and temperature of the galaxy.
If confirmed, the galaxy may have existed in its star formation phase in theearly universe, when it would have been composed mostly of dust as well as young and massivepopulation III stars.
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