A spectroscopic study of UM 673 A and B - On the size of Lyman-alpha clouds

Details A spectroscopic study of UM 673 A and B - On the size of Lyman-alpha clouds A spectroscopic study of UM 673 A and B - On the size of Lyman-alpha clouds

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...389...39s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 389, April 10, 1992, p. 39-62.

Astronomy and Astrophysics

Astrophysics

129

Astronomical Spectroscopy, Galactic Mass, Gravitational Lenses, Lyman Alpha Radiation, Quasars, Red Shift, Absorption Spectra, Heavy Elements, Hubble Constant, Line Spectra, Monte Carlo Method

Scientific paper

The Ly-alpha forest spectra obtained for the A and B images of the gravitationally lensed high-redshift quasar UM 673 are investigated, and higher resolution data of the brightest (A) image are presented. In the 2-A resolution spectra, all the absorption lines detected at 5 sigma in the spectrum of the fainter B image are present in the A image, but two anticoincidences, i.e., two lines in A which do not have a counterpart in B at more than a 3-sigma confidence level, are detected. Given the fact that corresponding Ly-alpha lines in the spectra of A and B have their equivalent widths well correlated, this proves that both light beams actually cross the same clouds. Most of the velocity differences between corresponding lines are compatible with 0 km/s within the error bars, with a standard deviation of 17 km/s. For the two major heavy-element systems detected in the spectrum of UM 673, no significant difference between the corresponding lines in the two spectra are found.

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