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Celestial Album
Ultra Deep redshift
02/07/11

 

Colour composite image of the Hubble Ultra Deep Field. Green circles mark the locations of lower-redshift candidate galaxies (z~8). Higher-redshift candidates are circled in red. The estimated distances to these candidates have not been confirmed spectroscopically. About 20 to 30 per cent of these high-z galaxy candidates are very close to foreground galaxies, consistent with the prediction that a significant fraction of galaxies at very high redshifts are gravitationally lensed by individual foreground galaxies. This will help as a guide for future observations planned for the James Webb Space Telescope when it is launched. Credit: HubbleSite

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