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UDFj-39546284
Hubble Space Telescope image of UDFj-39546284 (seen as a reddish spot in the center of the image)
Observation data (J2000 epoch)
Constellation	Fornax
Right ascension	03 32 39.54
Declination	−27° 46′ 28.5″
Redshift	11.58+0.05 −0.05
Apparent magnitude (V)	V fainter than 30.1 H160 = 28.92 ± 0.18 J125 – H160 > 2
Other designations
UDF12-3954-6285, JADES-GS-z11-0

UDFj-39546284 is a high-redshift Lyman-break galaxy discovered by the Hubble Space Telescope in infrared Hubble Ultra-Deep Field (HUDF) observations in 2009. The object, located in the Fornax constellation, was identified by G. Illingworth (UC Santa Cruz), R. Bouwens (UC Santa Cruz and Leiden University) and the HUDF09 Team during 2009 and 2010. It was reported with a redshift of z~10 using Hubble and Spitzer Space Telescope photometric data, with later reports in 2012 suggesting a possibly higher redshift of z = 11.9 Although doubts were raised that this galaxy could instead be a low-redshift interloper with extreme spectral emission lines producing the appearance of a very high redshift source, later spectroscopic observations by the James Webb Space Telescope's NIRSpec instrument in 2022 confirmed the galaxy's high redshift to a spectroscopically confirmed estimate of z = 11.58.

Gallery

• UDFj-39546284
• UDFj-39546284 appears as a faint red blob

See also

• EGSY8p7
• Hubble Ultra-Deep Field
• List of the most distant astronomical objects
• MACS0647-JD
• Reionization
• UDFy-38135539

References

1. ^ "[MDB2013] UDF12-3954-6284". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-02-13.
2. ^ Robertson, B. E.; et al. (2023). "Identification and properties of intense star-forming galaxies at redshifts z > 10". Nature Astronomy. 7 (5): 611–621. arXiv:2212.04480. Bibcode:2023NatAs...7..611R. doi:10.1038/s41550-023-01921-1. S2CID 257968812.
3. ^ Bouwens, R. J.; Oesch, P. A.; Illingworth, G. D.; Labbé, I.; Van Dokkum, P. G.; Brammer, G.; Magee, D.; Spitler, L. R.; Franx, M.; Smit, R.; Trenti, M.; Gonzalez, V.; Carollo, C. M. (2013). "Photometric Constraints on the Redshift of z ~ 10 Candidate UDFj-39546284 from Deeper WFC3/IR+ACS+IRAC Observations over the HUDF". The Astrophysical Journal Letters. 765 (1): L16. arXiv:1211.3105. Bibcode:2013ApJ...765L..16B. doi:10.1088/2041-8205/765/1/L16.
4. ^ Brammer, Gabriel B.; Van Dokkum, Pieter G.; Illingworth, Garth D.; Bouwens, Rychard J.; Labbé, Ivo; Franx, Marijn; Momcheva, Ivelina; Oesch, Pascal A. (2013). "A Tentative Detection of an Emission Line at 1.6 μm for the z ~ 12 Candidate UDFj-39546284". The Astrophysical Journal Letters. 765 (1): L2. arXiv:1301.0317. Bibcode:2013ApJ...765L...2B. doi:10.1088/2041-8205/765/1/L2. S2CID 119226564.
5. ^ R.J. Bouwens; G.D. Illingworth; I. Labbe; P.A. Oesch; M. Carollo; M. Trenti; P.G. van Dokkum; M. Franx; M. Stiavelli; V. Gonzalez; D. Magee; Bradley (2011). "A candidate redshift z ~ 10 galaxy and rapid changes in that population at an age of 500 Myr". Nature. 469 (7331): 504–507. arXiv:0912.4263. Bibcode:2011Natur.469..504B. doi:10.1038/nature09717. PMID 21270889. S2CID 4425674.
6. Staff (January 28, 2011). "Most Distant Galaxy Candidate Ever Seen in Universe". NASA. Retrieved December 13, 2012.
7. Staff. "Picture Album: Gray-scale Image of Object UDFj-39546284 from HUDF WFC3/IR". Space Telescope Science Institute. Retrieved December 13, 2012.
8. Wall, Mike (December 12, 2012). "Ancient Galaxy May Be Most Distant Ever Seen". Space.com. Retrieved December 12, 2012.

External links

• UDFj-39546284 on WikiSky

v t e Constellation of Fornax
List of stars in Fornax Fornax in Chinese astronomy Chandra Deep Field South Hubble Legacy Field
Stars	Bayer α (Dalim) β γ γ δ ε ζ η η η ι ι κ λ λ μ ν π ρ σ τ υ φ χ χ χ ψ ω Variable R TZ UZ HR 683 858 HD 15337 20781 20782 20868 (Intan) Other 2MASS J02431371−2453298 HIP 13044 LP 944-20 UDF 2457 WASP-72 (Diya)
Exoplanets HD 16417 b HD 20781 b c d e HD 20782 b HD 20868 b (Baiduri) TOI-849 b
Star clusters NGC 1049
Nebulae NGC 1360
Galaxies	NGC 823 824 922 986 1097 1210 1255 1288 1310 1316 1317 1318 1326 1350 1365 1374 1375 1379 1380 1381 1387 1398 1399 1406 1425 1427 Other Fornax Dwarf HUDF-JD2 GS-NDG-9422 IC 335 IC 1993 JADES-GS-z14-0 JADES-GS-z7-01-QU MRC 0316-257 PGC 13809 UDF 423 UDFj-39546284 UDFy-38135539
Galaxy clusters Fornax Cluster
Astronomical events SN 1992bd SN 1999eu SN 2003B
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Discoveries	UDFj-39546284 Swift J1644+57 Kronberger 61 WD 0806−661 ULAS J1120+0641 Kerberos (moon) PSR J1719−1438 Uranus trojan 2011 QF99 U1.11 SDSS J102915+172927 2 moons of Jupiter GRB 111209A
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Outer space portal Category:2010 in outer space — Category:2011 in outer space — Category:2012 in outer space

• Astronomical objects discovered in 2011
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