__NOTOC__ UDFj-39546284 is a high-

redshift In physics, a redshift is an increase in the wavelength, and corresponding decrease in the frequency and photon energy, of electromagnetic radiation (such as light). The opposite change, a decrease in wavelength and simultaneous increase in f ...

Lyman-break galaxy Lyman-break galaxies are star-forming galaxies at high redshift that are selected using the differing appearance of the galaxy in several imaging filters due to the position of the Lyman limit. The technique has primarily been used to select gala ...

discovered by the

Hubble Space Telescope The Hubble Space Telescope (often referred to as HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest and most versa ...

infrared Infrared (IR), sometimes called infrared light, is electromagnetic radiation (EMR) with wavelengths longer than those of visible light. It is therefore invisible to the human eye. IR is generally understood to encompass wavelengths from around ...

Hubble Ultra-Deep Field The Hubble Ultra-Deep Field (HUDF) is a deep-field image of a small region of space in the constellation Fornax, containing an estimated 10,000 galaxies. The original data for the image was collected by the Hubble Space Telescope from Septembe ...

(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 Leiden University (abbreviated as ''LEI''; nl, Universiteit Leiden) is a Public university, public research university in Leiden, Netherlands. The university was founded as a Protestant university in 1575 by William the Silent, William, Prince o ...

) and the HUDF09 Team during 2009 and 2010. It was reported with a redshift of ''z''~10 using Hubble and

Spitzer Space Telescope The Spitzer Space Telescope, formerly the Space Infrared Telescope Facility (SIRTF), was an infrared space telescope launched in 2003. Operations ended on 30 January 2020. Spitzer was the third space telescope dedicated to infrared astronomy, f ...

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 A spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies. Spectral lines are often used to iden ...

producing the appearance of a very high redshift source, later spectroscopic observations by the

James Webb Space Telescope The James Webb Space Telescope (JWST) is a space telescope which conducts infrared astronomy. As the largest optical telescope in space, its high resolution and sensitivity allow it to view objects too old, distant, or faint for the Hubble Spa ...

NIRSpec The NIRSpec (Near-Infrared Spectrograph) is one of the four scientific instruments flown on the James Webb Space Telescope (JWST). The JWST is the follow-on mission to the Hubble Space Telescope (HST) and is developed to receive more information ...

instrument in 2022 confirmed the galaxy's high redshift to a spectroscopically confirmed estimate of ''z'' = 10.38.

Gallery

File:Hudf09z10nl.png, UDFj-39546284 File:UDFj-39546284.tif, UDFj-39546284 appears as a faint red blob

References

External links

UDFj-39546284 on WikiSky
{{DEFAULTSORT:UDFj-39546284 20110127 Fornax (constellation) Dwarf galaxies Hubble Space Telescope Hubble Ultra-Deep Field

Gallery

See also

References

External links