/ftp/cats/J/ApJS/175/./29



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J/ApJS/175/29             QSO Pairs spectroscopy                 (Marble+, 2008)
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Beginning of ReadMe : J/ApJS/175/29 Spectroscopy of QSO pairs (Marble+, 2008) ================================================================================ The flux auto- and cross-correlation of the Lyalpha forest. I. Spectroscopy of QSO pairs with arcminute separations and similar redshifts. Marble A.R., Eriksen K.A., Impey C.D., Bai L., Miller L. <Astrophys. J. Suppl. Ser., 175, 29-47 (2008)> =2008ApJS..175...29M ================================================================================ ADC_Keywords: QSOs ; Spectroscopy ; Redshifts Keywords: cosmology: observations - errata, addenda - intergalactic medium quasars: absorption lines Abstract: The Lyalpha forest has opened a new redshift regime for cosmological investigation. At z>2 it provides a unique probe of cosmic geometry and an independent constraint on dark energy that is not subject to standard candle or ruler assumptions. In Paper I of this series on using the Lyalpha forest observed in pairs of QSOs for a new application of the Alcock-Paczynski test, we present and discuss the results of a campaign to obtain moderate-resolution spectroscopy (FWHM 2.5AA) of the Lyalpha forest in pairs of QSOs with small redshift differences (Deltaz<0.25, z>2.2) and arcminute separations (Theta<5'). This data set, composed of seven individual QSOs, 35 pairs, and one triplet, is also well suited for future investigations of the coherence of Lyalpha absorbers on  1Mpc transverse scales and the transverse proximity effect. We note seven revisions for previously published QSO identifications and/or redshifts. Description: Optical spectroscopy was obtained in the northern and southern hemispheres with the 6.5m MMT at Mount Hopkins, Arizona, and the twin 6.5m Magellan telescopes at Las Campanas, Chile (Clay and Baade telescopes in 2002 and 2003 respectively). All observations were made between 2002 April 12 and 2004 May 18.