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EGSY8p7 (EGSY-2008532660) is a distant galaxy, with a spectroscopic redshift of ''z'' = 8.68 (photometric redshift 8.57), a light travel distance of 13.2 billion light-years from Earth, an age of 13.2 billion years, and observed as it existed 570 million years after the Big Bang which occurred 13.8 billion years ago. 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. The light of the EGSY8p7 galaxy appears to have been magnified twofold by gravitational lensing in the light's travel to Earth, enabling detecting 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.〔 〕〔 〕〔 〕〔 〕〔 〕 == See also == *UDFj-39546284 (z=11.9) *MACS0647-JD (z=10.7) *UDFy-38135539 (z=8.55) *EGS-zs8-1 (z=7.73) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「EGSY8p7」の詳細全文を読む スポンサード リンク
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