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EGSY8p7 (EGSY-2008532660) is a distant galaxy in the constellation of Boötes, with a spectroscopic redshift of z = 8.68 (photometric redshift 8.57), a light travel distance of 13.2 billion light-years from Earth. Therefore, at an age of 13.2 billion years, it is observed as it existed 570 million years after the Big Bang, which occurred 13.8 billion years ago, using the W. M. Keck Observatory.[3] In July 2015, EGSY8p7 was announced as the oldest and most-distant known object, surpassing the previous record holder, EGS-zs8-1, which was determined in May 2015 as the oldest and most distant object. In March 2016, Pascal Oesch, one of the discoverers of EGSY8p7, announced the discovery of GN-z11, an older and more distant galaxy.[4]

EGSY8p7
EGSY-2008532660
EGSY8p7 by the Hubble and Spitzer space telescopes
Observation data (J2000 epoch)
ConstellationBoötes
Right ascension14h 20m 08.50s
Declination+52° 53′ 26.60″
Redshift8.68
Helio radial velocity2,603,098 km/s (1,617,490 mi/s)
Galactocentric velocity2,603,221 km/s (1,617,567 mi/s)
Distance13.2 billion ly (4.0 billion pc) (light travel distance)
30.5 billion ly (9.4 billion pc)
(comoving distance)
Apparent magnitude (V)25.3
Other designations
EGSY8p7,[1] EGS8p7[2]

Detection


The light of the EGSY8p7 galaxy appears to have been magnified twofold by gravitational lensing in the light's travel to Earth, enabling the detection of EGSY8p7, which would not have been possible without the magnification. EGSY8p7's distance from Earth was determined by measuring the redshift of Lyman-alpha emissions. EGSY8p7 is the most distant known detection of hydrogen's Lyman-alpha emissions. The distance of this detection was surprising, because neutral hydrogen (atomic hydrogen) clouds filling the early universe should have absorbed these emissions, even by some hydrogen cloud sources closer to Earth, according to the standard cosmological model. A possible explanation for the detection would be that reionization progressed in a "patchy" manner, rather than homogeneously throughout the universe, creating patches where the EGSY8p7 hydrogen Lyman-alpha emissions could travel to Earth, because there were no neutral hydrogen clouds to absorb the emissions.[5][1][6][2][7]


See also



References


  1. "A new record: Keck Observatory measures most distant galaxy" (Press release). W. M. Keck Observatory. Astronomy Now. 6 August 2015.
  2. Pyle, Rod (3 September 2015). "Farthest Galaxy Detected". Caltech.
  3. "New Record: Keck Observatory Measures Most Distant Galaxy | W. M. Keck Observatory". www.keckobservatory.org. Archived from the original on 15 August 2015. Retrieved 12 January 2022.
  4. Amos, Jonathan (March 3, 2016). "Hubble sets new cosmic distance record". BBC News. BBC News. Retrieved March 3, 2016.
  5. Wall, Mike (5 August 2015). "Ancient Galaxy Is Most Distant Ever Found". Space.com.
  6. Winkler, Mario De Leo (15 July 2015). "The Farthest Object in the Universe". Huffington Post.
  7. "Farthest Galaxy Detected | Caltech". 3 September 2015. Retrieved 2015-09-08.

Further reading




Records
Preceded by
GRB 090423
 Most distant known astronomical object
2015–2016		 Succeeded by
Preceded by Most distant known galaxy
2015–2016		 Succeeded by

На других языках

- [en] EGSY8p7

[es] EGSY8p7

EGSY8p7 (EGSY-2008532660) es una galaxia distante en la constelación de Camelopardalis, con un corrimiento al rojo espectroscópico de z = 8,68 (corrimiento al rojo fotométrico 8.57), una distancia de viaje de luz de 13,2 mil millones de años luz desde la Tierra. Por lo tanto, a una edad de 13.2 mil millones de años, se observa que existió 570 millones de años después del Big Bang, que ocurrió hace 13.8 mil millones de años, utilizando el Observatorio W. M. Keck. En julio de 2015, se anunció EGSY8p7 como el objeto conocido más antiguo y más lejano, superando al titular de registro anterior, EGS-zs8-1, que se determinó en mayo de 2015 como el objeto más antiguo y más distante. En marzo de 2016, Pascal Oesch, uno de los descubridores de EGSY8p7, anunció el descubrimiento de GN-z11, una galaxia más antigua y más distante.[1]

[ru] Egsy8p7

Egsy8p7 — галактика в созвездии Волопаса (экваториальные координаты: 14ч 20м 8,50с 52° 53′ 26,60″[3]), с июля 2015 года до открытия галактики GN-z11 1 марта 2016 года считалась наиболее удалённой от Земли. Имеет красное смещение z = 8,68, свет от галактики до Земли шёл 13,2 миллиарда лет. Обнаружена в обсерватории Кека на Гавайях (США) с использованием инфракрасного спектрографа MOSFIRE, зарегистрировавшего так называемую линию Лайман-альфа в спектре излучения галактики. Предыдущим рекордсменом была галактика EGS-zs8-1.


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