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Compact groups in theory and practice - III. Compact groups of galaxies in the Sixth Data Release of the Sloan Digital Sky Survey
Alan McConnachie, David Patton, Sara Ellison +1
We present the largest publicly available catalogue of compact groups of galaxies identified using the original selection criteria of Hickson, selected from the Sixth Data Release…
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.…
Compact groups in theory and practice - II. Comparing the observed and predicted nature of galaxies in compact groups
Crystal M. Brasseur, Alan W. McConnachie, Sara L. Ellison +1
We examine the properties of galaxies in compact groups identified in a mock galaxy catalogue based upon the Millennium Run simulation. The overall properties of groups identified…
Measuring Column Densities in Quasar Outflows: VLT Observations of QSO 2359-1241
Nahum Arav, Maxwell Moe, Elisa Costantini +3
We present high resolution spectroscopic VLT observations of the outflow seen in QSO 2359-1241. These data contain absorption troughs from five resonance Fe II lines with a resolut…
A search for damped Lyman-alpha systems towards radio-loud quasars I: The optical survey
Sara L. Ellison, Brian A. York, Max Pettini +1
We present the results from the optical component of a survey for damped Lyman-alpha systems (DLAs) towards radio-loud quasars. Our quasar sample is drawn from the Texas radio surv…
Compact groups in theory and practice - I. The spatial properties of compact groups
Alan W. McConnachie, Sara L. Ellison, David R. Patton
We use a mock galaxy catalogue based upon the Millennium Run simulation to investigate the intrinsic spatial properties of compact groups of galaxies. We find that approximately 30…