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75 papers
Properties of QSO Metal Line Absorption Systems at High Redshifts: Nature and Evolution of the Absorbers and New Evidence on Escape of Ionizing Radiation from Galaxies
Alec Boksenberg, Wallace L. W. Sargent
Using Voigt-profile-fitting procedures on Keck HIRES spectra of nine QSOs we identify 1099 CIV absorber components clumped in 201 systems outside the Lyman forest over 1.6 < z < 4.…
Extended and Filamentary Lyman Alpha Emission from the Formation of a Protogalactic Halo at z=2.63
Michael Rauch, George D. Becker, Martin G. Haehnelt +2
We report the observation of a further asymmetric, extended Lyman alpha emitting halo at z=2.63, from our ultra-deep, long-slit spectroscopic survey of faint high redshift emitters…
Iron and alpha-element Production in the First One Billion Years after the Big Bang
George D. Becker, Wallace L. W. Sargent, Michael Rauch +1
We present measurements of carbon, oxygen, silicon, and iron in quasar absorption systems existing when the universe was roughly one billion years old. We measure column densities…
Filamentary Infall of Cold Gas and Escape of Lyman Alpha and Hydrogen Ionizing Radiation from an Interacting High-Redshift Galaxy
Michael Rauch, George D. Becker, Martin G. Haehnelt +3
We present observations of a peculiar Lyman alpha-emitting galaxy at redshift 3.344, discovered in a deep, blind spectroscopic survey for faint Lyman alpha emitters with the Magell…
High-Redshift Metals. II. Probing Reionization Galaxies with Low-Ionization Absorption Lines at Redshift Six
George D. Becker, Wallace L. W. Sargent, Michael Rauch +1
We present a survey for low-ionization metal absorption line systems towards 17 QSOs at redshifts z_em=5.8-6.4. Nine of our objects were observed at high resolution with either Kec…
Keck ESI Observations of Metal-Poor Damped Lyman-α Systems
Bryan E. Penprase, J. Xavier Prochaska, Wallace L. W. Sargent +2
We present the first results from a survey of SDSS quasars selected for strong H I damped Lyman-α (DLA) absorption with corresponding low equivalent width absorption from strong lo…