MACS J1149 Lensed Star 1

MACS J1149 Lensed Star 1

Detection of MACS J1149 Lensed Star 1
A galactic cluster (left) magnified a distant star (now named Icarus) more than 2,000 times, making it visible in 2016 from Earth (lower right), 9.34 billion light-years away—although visible in 2016, the star was not visible in 2011 (upper right).
Observation data
Epoch J2000[1]      Equinox J2000[1]
Constellation Leo[1][2]
Right ascension 11h 49m 35.59s[1]
Declination 22° 23′ 47.4″[1]
Astrometry
DistanceRedshift of 1.49 yields comoving distances of 14.4 billion ly
Characteristics
Spectral type B[2]
Apparent magnitude (V) ≈28.4[2] (normally 29.9)[note 1]
Apparent magnitude (R) ≈28.2[2] (normally 29.7)
Apparent magnitude (Z) ≈27.9[2] (normally 29.4)
Apparent magnitude (J) 27.3[2] (normally 28.8)
Apparent magnitude (H) 27.4[2] (normally 28.9)
Details
Surface gravity (log g)2 - 4[2] cgs
Temperature11,000 – 14,000[2] K
Metallicity≈0.006[2]
Age~8[2] Myr
Other designations
Icarus, LS1, MACS J1149 LS1, MACS J1149 Lensed Star 1 (LS1), MACS J1149+2223 Lensed Star 1

MACS J1149 Lensed Star 1, also known as Icarus,[note 2] is a blue supergiant star observed through a gravitational lens. It is the seventh most distant individual star to have been detected so far (after Earendel, Godzilla, Mothra, Quyllur, star-1 and star-2), at approximately 14 billion light-years from Earth (redshift z=1.49; comoving distance of 14.4 billion light-years; lookback time of 9.34 billion years).[3][2][4][5][6][7][8] Light from the star was emitted 4.4 billion years after the Big Bang.[7] According to co-discoverer Patrick Kelly, the star is at least a hundred times more distant than the next-farthest non-supernova star observed, SDSS J1229+1122, and is the first magnified individual star seen.[4][7]

  1. ^ a b c d Kelly, P. L. (2015). "Multiple images of a highly magnified supernova formed by an early-type cluster galaxy lens". Science. 347 (6226): 1123–1126. arXiv:1411.6009. Bibcode:2015Sci...347.1123K. doi:10.1126/science.aaa3350. PMID 25745167. S2CID 206633888.
  2. ^ a b c d e f g h i j k l Kelly, Patrick L.; et al. (2 April 2018). "Extreme magnification of an individual star at redshift 1.5 by a galaxy-cluster lens". Nature Astronomy. 2 (4): 334–342. arXiv:1706.10279. Bibcode:2018NatAs...2..334K. doi:10.1038/s41550-018-0430-3. S2CID 125826925.
  3. ^ Staff (2018). "Cosmological information and results: redshift z=1.49". Wolfram Alpha. Retrieved 4 April 2018.
  4. ^ a b Jenkins, Ann; Villard, Ray; Kelly, Patrick (2 April 2018). "Hubble Uncovers the Farthest Star Ever Seen". NASA. Retrieved 2 April 2018.
  5. ^ Howell, Elizabeth (2 April 2018). "Rare Cosmic Alignment Reveals Most Distant Star Ever Seen". Space.com. Retrieved 2 April 2018.
  6. ^ Sanders, Robert (2 April 2018). "Hubble peers through cosmic lens to capture most distant star ever seen". Berkeley News. Retrieved 2 April 2018.
  7. ^ a b c Parks, Jake (2 April 2018). "Hubble spots farthest star ever seen". Astronomy. Retrieved 2 April 2018.
  8. ^ Cite error: The named reference RTRS-20180402 was invoked but never defined (see the help page).


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