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UVES observations of a damped Ly-alpha system at z_abs = 4.466 towards the quasar APM BR J0307-4945
M. Dessauges-Zavadsky, S. D'Odorico, R. G. McMahon +4
We present the first high-resolution (6.2 to 7.7 km/s FWHM) spectra of the APM BR J0307-4945 quasar at z_em = 4.73 obtained with UVES on the 8.2m VLT Kueyen telescope. We focus our…
Evidence for Large Scale Structure in the Lyman alpha Forest at z>2.6
G. M. Williger, A. Smette, C. Hazard +2
We present a search for spatial and redshift correlations in a 2 A resolution spectroscopic survey of the Lyman alpha forest at 2.15 < z < 3.37 toward ten QSOs concentrated within…
Evolution of Neutral Gas at High Redshift -- Implications for the Epoch of Galaxy Formation
L. J. Storrie-Lombardi, R. G. McMahon, M. J. Irwin
Though observationally rare, damped Lya absorption systems dominate the mass density of neutral gas in the Universe. Eleven high redshift damped Lya systems covering 2.8<z<4.4 were…
APM z>4 QSO Survey: Distribution and Evolution of High Column Density HI Absorbers
L. J. Storrie-Lombardi, M. J. Irwin, R. G. McMahon
Eleven candidate damped Lya absorption systems were identified in 27 spectra of the quasars from the APM z>4 survey covering the redshift range 2.8<z(abs)<4.4 (8 with z(abs)>3.5).…
APM z>4 QSO Survey: Spectra and Intervening Absorption Systems
L. J. Storrie-Lombardi, R. G. McMahon, M. J. Irwin +1
The APM multicolor survey for bright z > 4 objects, covering 2500 deg^2 of sky to m(R)~19, resulted in the discovery of thirty-one quasars with z > 4. High signal-to-noise optical…
Large-Scale Structure at z~2.5
G. M. Williger, C. Hazard, J. A. Baldwin +1
We have made a statistically complete, unbiased survey of C IV systems toward a region of high QSO density near the South Galactic Pole using 25 lines of sight spanning …
The Gunn-Peterson Effect in the Spectrum of the Z=4.7 QSO 1202-0725: The Intergalactic Medium at Very High Redshift
E. Giallongo, S. D'Odorico, A. Fontana +5
A measure of the average depression between Lyman absorption lines in the spectrum of the faint quasar BR1202-0725 () is presented. The relatively high resolution of…