195 citations · 1.1k across the 32 of their papers we have counts for
12 papers · 1 filter
A fourth HI 21-cm absorption system in the sight-line of MG J0414+0534: a record for intervening absorbers
A. Tanna, S. J. Curran, M. T. Whiting +2
We report the detection of a strong HI 21-cm absorption system at z=0.5344, as well as a candidate system at z=0.3389, in the sight-line towards the z=2.64 quasar MG J0414+0534. Th…
On the HI column density - radio source size anti-correlation in compact radio sources
S. J. Curran, J. R. Allison, M. Glowacki +2
Existing studies of the atomic hydrogen gas content in distant galaxies, through the absorption of the 21-cm line, often infer that the total column density is anti-correlated with…
A survey for HI in the distant Universe: the detection of associated 21-cm absorption at z=1.28
S. J. Curran, M. T. Whiting, A. Tanna +3
We have undertaken a survey for HI 21-cm absorption within the host galaxies of z ~ 1.2 - 1.5 radio sources, in the search of the cool neutral gas currently "missing" at z > 1. Thi…
A survey for the missing hydrogen in high redshift radio sources
S. J. Curran, M. T. Whiting, E. M. Sadler +1
Unlike at lower redshift, where there is a 40% detection rate, surveys for 21-cm absorption arising within the hosts of z > 1 radio galaxies and quasars have been remarkably unsucc…
A search for 21 cm HI absorption in AT20G compact radio galaxies
J. R. Allison, S. J. Curran, B. H. C. Emonts +7
We present results from a search for 21 cm associated HI absorption in a sample of 29 radio sources selected from the Australia Telescope 20 GHz survey. Observations were conducted…
Complete ionisation of the neutral gas: why there are so few detections of 21-cm hydrogen in high redshift radio galaxies and quasars
S. J. Curran, M. T. Whiting
From the first published z > 3 survey of 21-cm absorption within the hosts of radio galaxies and quasars, we found an apparent dearth of cool neutral gas at high redshift. From a d…
Application of a Bayesian Method to Absorption Spectral-Line Finding in Simulated ASKAP Data
J. R. Allison, E. M. Sadler, M. T. Whiting
The large spectral bandwidth and wide field of view of the Australian SKA Pathfinder radio telescope will open up a completely new parameter space for large extragalactic HI survey…
On the absence of molecular absorption in high redshift millimetre-band searches
S. J. Curran, M. T. Whiting, F. Combes +6
We have undertaken a search for millimetre-wave band absorption (through the CO and HCO+ rotational transitions) in the host galaxies of reddened radio sources (z = 0.405-1.802). D…
Localised HI 21-cm absorption towards a double-lobed z=0.24 radio galaxy
S. J. Curran, M. T. Whiting, J. K. Webb +1
We present the results of a mini-survey for associated HI 21-cm absorption at z < 0.42 with the Giant Metrewave Radio Telescope. Our targets are radio galaxies, selected on the bas…
A third HI 21-cm absorption system in the sight-line of MG J0414+0534: A redshift for Object X?
S. J. Curran, M. T. Whiting, A. Tanna +2
We report the detection of a third HI 21-cm absorber in the sight-line towards the z=2.64 quasar MG J0414+0534 (4C +05.19). In addition to the absorption at the host redshift and i…
Redshifted HI and OH absorption in radio galaxies and quasars
S. J. Curran, M. T. Whiting, M. T. Murphy +6
From a survey for redshifted HI 21-cm and OH 18-cm absorption in the hosts of a sample of radio galaxies and quasars, we detect HI in three of the ten and OH in none of the fourtee…
HI 21-cm absorption and unified schemes of active galactic nuclei
S. J. Curran, M. T. Whiting
In this paper we further explore the implications that this has for the currently popular consensus that it is the orientation of the circumnuclear obscuring torus which determines…