9 papers
Revisiting the origin of the high metallicities of sub-damped Lyman-alpha systems
Miroslava Dessauges-Zavadsky, Sara L. Ellison, Michael T. Murphy
Sub-damped Lyman-alpha systems (sub-DLAs) have previously been found to exhibit a steeper metallicity evolution than the classical damped Lyman-alpha systems (DLAs), evolving to cl…
The kinematic signature of damped Lyman alpha systems: Using the D-index to screen for high column density HI absorbers
Sara L. Ellison, Michael T. Murphy, Miroslava Dessauges-Zavadsky
Using a sample of 21 damped Lyman alpha systems (DLAs) and 35 sub-DLAs, we evaluate the D-index = EW / Delta v x 1000 from high resolution spectra of the MgII lambda 2796 profile.…
High-Redshift Starbursting Dwarf Galaxies Revealed by GRB Afterglows
Hsiao-Wen Chen, Daniel A. Perley, Lindsey K. Pollack +7
We present a study of 15 long-duration gamma-ray burst (GRB) host galaxies at z>2. The GRBs are selected with available early-time afterglow spectra in order to compare interstella…
Strong magnetic fields in normal galaxies at high redshifts
Martin L. Bernet, Francesco Miniati, Simon J. Lilly +2
The origin and growth of magnetic fields in galaxies is still something of an enigma. It is generally assumed that seed fields are amplified over time through the dynamo effect, bu…
A Survey for NV Absorption at z~z_GRB in GRB Afterglow Spectra: Clues to Gas Near the Progenitor Star
Jason X. Prochaska, Miroslava Dessauges-Zavadsky, Enrico Ramirez-Ruiz +1
We survey NV absorption in the afterglow spectra of long-duration gamma-ray bursts (GRBs) with the intent to study highly ionized gas in the galaxies hosting these events. We ident…
From Espresso to Codex
J. Liske, L. Pasquini, P. Bonifacio +24
CODEX and ESPRESSO are concepts for ultra-stable, high-resolution spectrographs at the E-ELT and VLT, respectively. Both instruments are well motivated by distinct sets of science…