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Discovery of excess O I absorption towards the z = 6.42 QSO SDSS J1148+5251
George D. Becker, Wallace L. W. Sargent, Michael Rauch +1
We present a search for O I in the spectra of nine 4.9 < z_qso < 6.4 QSOs taken with Keck/HIRES. We detect six systems with N(O I) > 10^13.7 cm^{-2} in the redshift intervals where…
Expansion and Collapse in the Cosmic Web
Michael Rauch, George D. Becker, Matteo Viel +5
We study the kinematics of the gaseous cosmic web at high redshift with Lyman alpha forest absorption in multiple QSO sightlines. Using a simple analytic model and a cosmological h…
Observations of Chemically Enriched QSO Absorbers near z ~ 2.3 Galaxies: Galaxy-Formation Feedback Signatures in the IGM
Robert A. Simcoe, Wallace L. W. Sargent, Michael Rauch +1
We present a study of galaxies and intergalactic gas toward the z=2.73 quasar HS1700+6416, to explore the effects of galaxy formation feedback on the IGM. Our observations and ioni…