Common Lyman-alpha absorption toward the quasar pair Q1343+2640A, B: Evidence for large and quiescent clouds

Details Common Lyman-alpha absorption toward the quasar pair Q1343+2640A, B: Evidence for large and quiescent clouds Common Lyman-alpha absorption toward the quasar pair Q1343+2640A, B: Evidence for large and quiescent clouds

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...437l..87d&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 437, no. 2, p. L87-L90

Astronomy and Astrophysics

Astronomy

108

Absorption Spectra, Gravitational Lenses, Intergalactic Media, Lyman Alpha Radiation, Quasars, Size Determination, Ultraviolet Astronomy, Absorption Spectroscopy, Galactic Clusters, Metallicity, Red Shift, Velocity Distribution

Scientific paper

We present observations of the Lyman alpha forest of the close quasar pair Q1343+2640A (zem = 2.029) and B (zem = 2.031). We detect eight absorption lines of Lyman alpha common to both spectra and not attributable to metal-line systems in the redshift range 1.7 less than z less than 2.1 and four lines which are seen in one spectrum but not the other. At the 9.5 sec separation of the two quasars, this implies a firm lower limit on the characteristic size of the Lyman alpha clouds of 40/h100 kpc (where h100 identically equals H0/100 km/s/Mpc, q0 = 0.5) at a redshift z approximately equal to 1.8. The upper limit on the cloud size is much more uncertain owing to the small number of observed lines, but taking the observed fraction of common lines at face value in the context of a simple model, the absorbers are shown to have radii smaller than about 310/h100 kpc. Significant velocity and equivalent width variations are seen with an rms velocity difference of approximately 65 km/s between the common absorption lines along the two lines of sight.

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