124 citations · 1.8k across the 68 of their papers we have counts for
8 papers · 2 filters
Illuminating the past 8 billion years of cold gas towards two gravitationally lensed quasars
J. R. Allison, V. A. Moss, J. -P. Macquart +15
Using the Boolardy Engineering Test Array of the Australian Square Kilometre Array Pathfinder (ASKAP BETA), we have carried out the first survey for HI and OH absorptio…
Observed Faraday Effects in Damped Lyman-Alpha Absorbers and Lyman Limit Systems: The Magnetised Environment of Galactic Building Blocks at Redshift=2
J. S. Farnes, L. Rudnick, B. M. Gaensler +3
Protogalactic environments are typically identified using quasar absorption lines, and these galactic building blocks can manifest as Damped Lyman-Alpha Absorbers (DLAs) and Lyman…
OH+ and H2O+ absorption toward PKS1830-211
S. Muller, H. S. P. M"uller, J. H. Black +13
We report the detection of OH+ and H2O+ in the z=0.89 absorber toward the lensed quasar PKS1830-211. The abundance ratio of OH+ and H2O+ is used to quantify the molecular hydrogen…
A comparative study of intervening and associated HI 21-cm absorption profiles in redshifted galaxies
S. J. Curran, S. W. Duchesne, A. Divoli +1
The star-forming reservoir in the distant Universe can be detected through HI 21-cm absorption arising from either cool gas associated with a radio source or from within a galaxy i…
Using 21-cm absorption surveys to measure the average HI spin temperature in distant galaxies
J. R. Allison, M. A. Zwaan, S. W. Duchesne +1
We present a statistical method for measuring the average HI spin temperature in distant galaxies using the expected detection yields from future wide-field 21cm absorption surveys…
A correlation between the HI 21-cm absorption strength and impact parameter in external galaxies
S. J. Curran, S. N. Reeves, J. R. Allison +1
By combining the data from surveys for HI 21-cm absorption at various impact parameters in near-by galaxies, we report an anti-correlation between the 21-cm absorption strength (ve…
HI emission and absorption in nearby, gas-rich galaxies II. -- sample completion and detection of intervening absorption in NGC 5156
S. N. Reeves, E. M. Sadler, J. R. Allison +6
We present the results of a survey for intervening 21cm HI absorption in a sample of 10 nearby, gas-rich galaxies selected from the HI Parkes All-Sky Survey (HIPASS). This follows…
A search for HI and OH absorption in z > 3 CO emitters
S. J. Curran, J. R. Allison, M. T. Whiting +5
We present the results of a survey for HI 21-cm and OH 18-cm absorption in seven strong CO emitters at z > 3. Despite reaching limits comparable to those required to detect 21-cm a…