High-Redshift Metals. I. The Decline of C IV at z > 5.3 (2009)
Becker, George D., Rauch, Michael, Sargent, Wallace L. W.
We present the results from our search for C iv absorption systems at redshifts z = 5.3-6.0. We have observed four z ~ 6 QSOs with Keck/NIRSPEC in echelle mode. The data are the most sensitive yet...
Resolving the high redshift Lyman-alpha forest in smoothed particle hydrodynamics simulations (2009)
Bolton, James S., Becker, George D.
We use a large set of cosmological smoothed particle hydrodynamics (SPH) simulations to examine the effect of mass resolution and box size on synthetic Lya forest spectra at 2 \leq z \leq 5. The mass...
High Redshift Metals I.: The Decline of C IV at z > 5.3 (2008)
Becker, George D., Rauch, Michael, Sargent, Wallace L. W.
We present the results from our search for C IV in the intergalactic medium at redshifts z=5.3-6.0. We have observed four z~6 QSOs with Keck/NIRSPEC in echelle mode. The data are the most sensitive...
Viel, Matteo, Becker, George D., Bolton, James S., Haehnelt, Martin G., Rauch, Michael, Sargent, Wallace L.
We present constraints on the mass of warm dark matter (WDM) particles derived from the Lyman-alpha flux power spectrum of 55 high-resolution HIRES spectra at 2.0~5.6 keV (2sigma) for sterile...
Viel, Matteo, Becker, George D., Bolton, James S., Haehnelt, Martin G., Rauch, Michael, Sargent, Wallace L. W.
The Evolution of Optical Depth in the Lyα Forest: Evidence Against Reionization at z~6 (2007)
Becker, George D., Rauch, Michael, Sargent, Wallace L. W.
We examine the evolution of the IGM Lyα optical depth distribution using the transmitted flux probability distribution function (PDF) in a high-resolution sample of 55 QSOs spanning absorption...
A high-resolution study of the high-redshift intergalactic medium (2007)
We present a study of the structure and evolution of the high-redshift intergalactic medium (IGM) using a variety of approaches based on high-resolution quasar spectra. We first use the...
The Evolution of Optical Depth in the Ly-alpha Forest: Evidence Against Reionization at z~6 (2006)
Becker, George D., Rauch, Michael, Sargent, Wallace L. W.
We examine the evolution of the IGM Ly-alpha optical depth distribution using the transmitted flux probability distribution function (PDF) in a sample of 63 QSOs spanning absorption redshifts 1.7 < z...
A high-resolution study of the high-redshift intergalactic medium (2006)
We present a study of the structure and evolution of the high-redshift intergalactic medium (IGM) using a variety of approaches based on high-resolution quasar spectra. We first use the...
Discovery of excess O I absorption towards the z = 6.42 QSO SDSS J1148+5251 (2005)
Becker, George D., Sargent, Wallace L. W., Rauch, Michael, Simcoe, Robert A.
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 O I 1302 falls...
Expansion and Collapse in the Cosmic Web (2005)
Rauch, Michael, Becker, George D., Viel, Matteo, Sargent, Wallace L. W., Smette, Alain, Simcoe, Robert A., ...
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 hydrodynamic...
Simcoe, Robert A., Sargent, Wallace L. W., Rauch, Michael, Becker, George D.
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 ionization simulations...
Supernova Remnants in the Fossil Starburst in M82 (1999)
De Grijs, Richard, O'Connell, Robert W., Becker, George D., Chevalier, Roger A., Gallagher III, John S.
We report the discovery of ten compact H-alpha-bright sources in the post-starburst region northeast of the center of M82, ``M82 B.'' These objects have H alpha luminosities and sizes consistent with...