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Дата изменения: Wed Oct 28 09:48:20 2009
Дата индексирования: Wed Sep 15 15:13:55 2010
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JKCS041: The Farthest Galaxy Cluster Yet Measured
Astronomy Picture of the Day
    


JKCS041: The Farthest Galaxy Cluster Yet Measured
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JKCS041: The Farthest Galaxy Cluster Yet Measured
Credit: X-ray: NASA, CXC, INAF, S. Andreon et al.; Optical: DSS, ESO/VLT
Explanation: What if we could see back to the beginning of the universe? We can -- since it takes the age of the universe for light to cross the universe. Peering at distant objects, therefore, tells us about how the universe used to be, even near its beginning. Since telescopes are therefore also time portals, observations of distant clusters can be used, for example, to investigate when and how these huge galaxy conglomerations formed. Previously, the redshift record for a galaxy cluster was about 1.5, corresponding to about nine billion light years distant. Recently, using data including X-ray images from the orbiting Chandra X-Ray Observatory, a new furthest cluster was identified. Shown above, JKCS041 is seen at redshift 1.9, corresponding to nearly one billion light years further than the previous record holder. The hot X-ray gas that confirmed the apparent galaxy grouping as a true cluster of galaxies is shown above in diffuse blue, superposed on an optical image showing many foreground stars. JKCS041 is seen today as it appeared at only one quarter of the present age of the universe.



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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Based on Astronomy Picture Of the Day

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