385 citations · 933 across the 10 of their papers we have counts for
5 papers · 1 filter
Mg II Absorption at 2<z<7 with Magellan/FIRE, III. Full Statistics of Absorption Towards 100 High-Redshift QSOs
Shi-Fan S. Chen, Robert A. Simcoe, Paul Torrey +12
We present final statistics from a survey for intervening MgII absorption towards 100 quasars with emission redshifts between and . Using infrared spectra from Mag…
Extremely metal-poor gas at a redshift of 7
Robert A. Simcoe, Peter W. Sullivan, Kathy L. Cooksey +3
In typical astrophysical environments, the abundance of heavy elements ranges from 0.001 to 2 times the solar concentration. Lower abundances have been seen in select stars in the…
MgII Absorption at 2 < z < 6 with Magellan / FIRE. II: A Longitudinal Study of HI, Metals, and Ionization in Galactic Haloes
Michael S. Matejek, Robert A. Simcoe, Kathy L. Cooksey +1
We present a detailed study of HI and metals for 110 MgII absorption systems discovered at 1.98 <= z <= 5.33 in the infrared spectra of high redshift QSOs. Using new measurements o…
A Survey of MgII Absorption at 2 < z < 6 with Magellan / FIRE: I: Sample and Evolution of the MgII Frequency
Michael S. Matejek, Robert A. Simcoe
We present initial results from the first systematic survey for MgII quasar absorption lines at z > 2.5. Using infrared spectra of 46 high-redshift quasars, we discovered 111 MgII…
Constraints on the Universal CIV Mass Density at z~6 from Early IR Spectra Obtained with the Magellan FIRE Spectrograph
Robert A. Simcoe, Kathy L. Cooksey, Michael E. Matejek +9
We present a new determination of the intergalactic CIV mass density at 4.3 < z < 6.3. Our constraints are derived from high signal-to-noise spectra of seven quasars at z > 5.8 obt…