Improved lower limits on Lyman-alpha forest cloud dimensions and additional evidence supporting the gravitational lens nature of 2345 + 007A,B
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Abstract
Spectra have been obtained of the QSO pair 2345 + 007A,B previously reported as a gravitational lens candidate. These new observations strongly support the interpretation of the pair as a gravitationally split image. In addition, several Ly-alpha absorption-line systems are found in common between the two images, yielding a new lower limit of the order of 5-25 kpc for the characteristic size of the Ly-alpha clouds at redshift z = 2. There appear to be two or three lines which are not in common or are of substantially different strengths, so that this scale may be a rough characteristic size rather than a lower limit. One metal-line system is also found in common, which exhibits a marked difference between the two QSO images in the low-ionization component.
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