z8_GND_5296
| z8_GND_5296 | |
|---|---|
| File:Z8 GND 5296 CANDEL crop.jpg | |
| Observation data | |
| Constellation | Ursa Major |
| Right ascension | 12h 36m 37.90s |
| Declination | 62° 18′ 08.5″ |
| Redshift | 7.51 |
| Distance | 13.1 billion light-years (light travel distance) ~30 billion light-years (present comoving distance) |
| Apparent magnitude (V) | 25.6 (F160W) |
| Characteristics | |
| Mass | 1.0+0.2 −0.1×109 M☉ |
References: [1] | |
z8_GND_5296 is a galaxy which, after its discovery in October 2013, was announced as one with the greatest redshift that has been confirmed through the Lyman-alpha emission line of hydrogen,[1] putting it among the oldest and most distant known galaxies at approximately 13 gigalight-years (4.0×109 pc) from Earth.[2][3] It is "seen as it was at a time just 700 million years after the Big Bang [...] when the universe was only about 5 percent of its current age of 13.8 billion years".[4] The galaxy is at a redshift of 7.51, and it is neighbour to what was announced then as second most distant galaxy with a redshift of 7.2. The galaxy in its observable timeframe was producing stars at a phenomenal rate, equivalent in mass to about 300 suns per year.[1]
The light reaching Earth from z8_GND_5296 left that galaxy over 13 billion years ago, corresponding to a distance of over 13 billion light-years (13 gigalight-years). Allowing for the expansion of the universe since it was observed, the position of the galaxy is now unobservable, being beyond the cosmic horizon, but may be extrapolated to about 30 gigalight-years (9.2 Gpc) (comoving distance) from Earth.[5]
Discovery
Research published in the October 24, 2013 issue of the journal Nature by a team of astronomers from The University of Texas at Austin led by Steven Finkelstein in collaboration with astronomers at the Texas A&M University, the National Optical Astronomy Observatories and University of California, Riverside, describes discovery of the most distant galaxy known using deep optical and infrared images taken by the Hubble Space Telescope. Their discovery was confirmed by the W. M. Keck Observatory in Hawaii. MOSFIRE (a new instrument on the Keck Telescope that is extremely sensitive to infrared light) proved instrumental to this finding.[6]
ndard SED fitting procedures|journal=Astronomy and Astrophysics|volume=363|pages=476–492 |year=2000|bibcode=2000A%26A...363..476B}}</ref>
See also
- Galactic orientation
- List of the most distant astronomical objects
- Luminous infrared galaxy
- Timeline of knowledge about galaxies, clusters of galaxies, and large-scale structure
References
- ^ a b c Finkelstein, S. L. (2013). "A galaxy rapidly forming stars 700 million years after the Big Bang at redshift 7.51". Nature. 502 (7472): 524. arXiv:1310.6031. doi:10.1038/nature12657.
{{cite journal}}: Unknown parameter|coauthors=ignored (|author=suggested) (help) - ^ Mihir Shukla (26 October 2013). "Farthest galaxy ever seen discovered by UT researchers". The Horn. Retrieved 30 October 2013.
- ^ MATTHEW FRANCIS (23 October 2013). "Taking Measure: A 'New' Most Distant Galaxy". Universe Today. Retrieved 30 October 2013.
- ^ Johnson, Rebecca (23 October 2013). "Texas Astronomer Discovers Most Distant Known Galaxy". University of Texas at Austin.
- ^ Morelle, Rebecca (24 October 2013). "New galaxy 'most distant' yet discovered". BBC. Retrieved 24 October 2013.
- ^ "Astronomers discover the most distant known galaxy: Galaxy seen as it was just 700 million years after Big Bang". ScienceDaily. 23 October 2013. Retrieved October 24, 2013.
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