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An excess of damped Lyman alpha galaxies near QSOs
David M. Russell, Sara L. Ellison, Chris R. Benn
We present a sample of 33 damped Lyman alpha systems (DLAs) discovered in the Sloan Digital Sky Survey (SDSS) whose absorption redshifts (z_abs) are within 6000 km/s of the QSO's s…
Gas and dust properties in the afterglow spectra of GRB 050730
R. L. C. Starling, P. M. Vreeswijk, S. L. Ellison +9
We present early WHT ISIS optical spectroscopy of the afterglow of gamma-ray burst GRB 050730. The spectrum shows a DLA system with the highest measured hydrogen column to date: N(…
Strong Line Metallicity Calibrators Applied to SDSS Galaxies
Sara L. Ellison, Lisa J. Kewley
We calculate the oxygen abundances for ~45,000 star-forming galaxies selected from the SDSS using nine popular `strong-line' metallicity diagnostics. We find that individual galaxi…
The Optical - Infrared Colors of CORALS QSOs: Searching for Dust Reddening Associated With High Redshift Damped Lyman Alpha Systems
Sara L. Ellison, Patrick B. Hall, Paulina Lira
The presence of dust in quasar absorbers, such as damped Lyman alpha (DLA) systems, may cause the background QSO to appear reddened. We investigate the extent of this potential red…
Zn and Cr abundances in damped Lyman alpha systems from the CORALS survey
Chris J. Akerman, Sara L. Ellison, Max Pettini +1
We present metal abundances in 15 damped Lyman alpha systems (DLAs) from the Complete Optical and Radio Absorption Line System (CORALS) survey, designed to be free from any biasing…
A Search For Organic Molecules in Intermediate Redshift DLAs
Brandon Lawton, Brian York, Sara L. Ellison +3
There has been a renewed interest in searching for diffuse interstellar bands (DIBs) due to their probable connection to organic molecules and, thus, their possible link to life in…
Absorption Systems In Radio-Selected QSO Surveys
Sara L. Ellison
Radio-selected samples of quasars with complete optical identifications offer an ideal dataset with which to investigate dust bias associated with intervening absorption systems. H…