RD1
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RD1 or 0140+326 RD1 is a distant galaxy, it once held the title of most distant galaxy known.[1] RD1 was discovered in March 1998, and is at z = 5.34,[2] and was the first object found to exceed redshift 5.[3] It bested the previous recordholders, a pair of galaxies at z=4.92 lensed by the galaxy cluster CL 1358+62 (CL 1358+62 G1 & CL 1358+62 G2). It was the most distant object known to mankind for a few months in 1998, until BR1202-0725 LAE was discovered at z = 5.64.
Distance measurements
The "distance" of a far away galaxy depends on the chosen distance measurement. With a redshift of 5.34,[2] light from this galaxy is estimated to have taken around 12.5 billion years to reach us.[4] But since this galaxy is receding from Earth, the present comoving distance is estimated to be around 26 billion light-years.[4]
References
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- ↑ Astronomy Picture of the Day, A Baby Galaxy Template:Webarchive, March 24, 1998
- ↑ a b arXiv, Script error: No such module "Citation/CS1". (209 KB)Script error: No such module "Check for unknown parameters"., 11 March 1998
- ↑ New York Times, Peering Back in Time, Astronomers Glimpse Galaxies Aborning Template:Webarchive, October 20, 1998
- ↑ a b Script error: No such module "citation/CS1".
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