ILT J2336+1842
| ILT J2336+1842 | |
|---|---|
DESI Legacy DR10 image of ILT J2336+1842 | |
| Observation data (J2000 epoch) | |
| Constellation | Pegasus |
| Right ascension | 23h 36m 24.69s |
| Declination | +18° 42' 48.71" |
| Redshift | 6.6 |
| Heliocentric radial velocity | 289588 |
| Distance | 17.547 bly (5,380 mpc) |
| Characteristics | |
| Type | QSO |
| Size | 8,500 ly (2,600 pc) |
| Other designations | |
| ILT J233624.72+184247.9, J2336+1842 | |
ILT J2336+1842 also known as ILT J233624.72+184247.9 is a high-redshift quasar, and radio galaxy at z = 6.6, equivalent to a distance of 17.55 billion light years (5,380 megaparsecs) away.[1] The galaxy has an apparent Z magnitude of 22.04 and is in the constellation of Pegasus.[1][2] The galaxy was first discovered in 2022 in a survey of 24 radio-bright quasars between redshifts z = 4.9 to z = 6.6.[3] As of 2023, it is believed to be the most distant radio galaxy known, greatly succeeding TGSS J1530+1049.[2]
Physical properties
ILT J2336+1842 is a dwarf galaxy that is not known to be a part of galaxy clusters and it is probably a field galaxy.[1][4] Using an angular diameter of 0.1 arcsecs from the eight data release from the DESI telescope,[5] and a redshift-based distance of 5,380 megaparsecs, it has an estimated diameter of 8,500 light years (2,600 parsecs).[4]
The galactic center contains a radio-bright quasar with an estimated absolute luminosity of -24.32, equivalent to 457.09 billion L☉ making it one of the most luminous high redshift quasars discovered.[3]
In 2023, it was discovered in the second data-release of the LOFAR Two-Metre Sky Survey (LoTSS).[2] The radio lobes have an extent of 54.8 kiloparsecs or 179,000 light years across based on an angular diameter of 10.13 arcsecs.[2] With a predicted redshift of z = 6.6 it is believed to the furthest known radio galaxy being more distant than the previous most distant radio galaxy, TGSS J1530+1049.[2]
See also
- TGSS J1530+1049, previous most distant radio galaxy.
- GLEAM J0917-0012, potentially more distant with a maximum redshift of z = 8.
References
- ^ a b c "SIMBAD Results for ILT J233624.72+184247.9". SIMBAD. Retrieved 2025-12-12.
- ^ a b c d e Hardcastle, M. J. (2023). "The LOFAR Two-Metre Sky Survey. VI. Optical identifications for the second data release". NASA ADS. Retrieved 2025-12-12.
- ^ a b Gloudemans, A. J. (2022). "Discovery of 24 radio-bright quasars at 4.9 ≤ z ≤ 6.6 using low-frequency radio observations". NASA ADS. Retrieved 2025-12-12.
- ^ a b "NED Results for [GDS2022] ILT J2336+1842". NASA/IPAC Extragalactic Database. Retrieved 2025-12-12.
- ^ Duncan, K. J. (2022). "VizieR Online Data Catalog: DESI Legacy Imaging Surveys DR8 photometric redshifts (Duncan, 2022)". NASA ADS. Retrieved 2025-12-12.