Improved lower limits on Lyman-alpha forest cloud dimensions and additional evidence supporting the gravitational lens nature of 2345 + 007A,B

Details Improved lower limits on Lyman-alpha forest cloud dimensions and additional evidence supporting the gravitational lens nature of 2345 + 007A,B Improved lower limits on Lyman-alpha forest cloud dimensions and additional evidence supporting the gravitational lens nature of 2345 + 007A,B

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...281l...1f&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 281, June 1, 1984, p. L1-L4. Research supported by

Astronomy and Astrophysics

Astrophysics

136

Astronomical Spectroscopy, Gravitational Lenses, Lyman Alpha Radiation, Quasars, Absorption Spectra, Red Shift

Scientific paper

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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