Common Lyman Alpha Absorption Toward the Quasar Pair 1343+2640AB: Evidence for Large and Quiescent Clouds

Details Common Lyman Alpha Absorption Toward the Quasar Pair 1343+2640AB: Evidence for Large and Quiescent Clouds Common Lyman Alpha Absorption Toward the Quasar Pair 1343+2640AB: Evidence for Large and Quiescent Clouds

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.1402d&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #14.02; Bulletin of the American Astronomical Society, Vol. 26, p.1331

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Models of the absorbing ``clouds'' responsible for the Lya forest observed in spectra of high-redshift quasars require some knowledge of the size of the clouds, which to-date remains poorly constrained. We present observations of the Lya forest of the close quasar pair 1343+2640A (zem = 2.029) and B (zem = 2.031). We detect eight absorption lines of Lya common to both spectra and not attributable to metal line systems in the redshift range 1.7 < z < 2.1, and four lines which are seen in one spectrum but not the other. At the 9.5('') separation of the two quasars, this implies a firm lower limit on the characteristic size of the Lya clouds of 40 h(-1}_{100) kpc (where h100 equiv H_0/100 kms(-1) Mpc(-1) , q_0 = 0.5) at a redshift z =~ 1.8. The upper limit on the cloud size is much more uncertain due 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 have diameters smaller than about 620 h(-1}_{100) kpc. Significant velocity and equivalent width variations are seen with an rms velocity difference of ~ 65\kms\ between the common absorption lines along the two lines of sight. The large extent and quiescent state of the clouds pose a serious challenge to current theoretical models of the Lya absorbers.

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