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A comprehensive set of elemental abundances in damped Ly-alpha systems: revealing the nature of these high-redshift galaxies
M. Dessauges-Zavadsky, F. Calura, J. X. Prochaska +2
By combining our UVES-VLT spectra of a sample of four damped Ly-alpha systems (DLAs) toward the quasars Q0100+13, Q1331+17, Q2231-00 and Q2343+12 with the existing HIRES-Keck spect…
Constraining Variations in the Fine-structure Constant, Quark Masses and the Strong Interaction
M. T. Murphy, V. V. Flambaum, J. K. Webb +3
We present evidence for variations in the fine-structure constant from Keck/HIRES spectra of 143 quasar absorption systems over the redshift range 0.2 < z_abs < 4.2. This includes…
Comparing Chemical Abundances of the Damped Lya Systems and Metal-Poor Stars
Jason X. Prochaska
I briefly draw comparisons between the fields of damped Lya and metal-poor stellar abundances. In particular, I examine their complementary age-metallicity relations and comparison…
Chemical Abundances in the Damped Lya Systems
Jason X. Prochaska
I introduce and review the data and analysis techniques used to measure abundances in the damped Lya systems, quasar absorption-line systems associated with galaxies in the early U…
Chemical Evolution of Damped Lyman Alpha Systems
F. Calura, F. Matteucci, M. Dessauges-Zavadsky +3
By means of detailed chemical evolution models for galaxies of different morphological types (i.e. spirals, irregular/starburst galaxies and ellipticals) we study the nature of Dam…
The C IV Mass Density of the Universe at Redshift 5
Max Pettini, Piero Madau, Michael Bolte +3
In order to search for metals in the Lyman alpha forest at redshifts z > 4, we have obtained spectra of high S/N and resolution of three QSOs at z > 5.4 discovered by the Sloan Dig…