195 citations · 1.1k across the 32 of their papers we have counts for
32 papers
Merger remnant in TXS 1033+026 - I: and HI 21-cm observations suggest counter-rotating gas
J. N. H. S. Aditya, Hyein Yoon, L. G. Dahmer-Hahn +5
We conducted eMERLIN and Gemini integral field unit (IFU) observations towards TXS 1033+026, a post-merger ultraluminous infrared galaxy, to study the radio continuum and …
A FLASH HI absorption search in compact sources in the pilot ASKAP interplanetary scintillation field
Paris E. Gordon-Hall, Emily F. Kerrison, Elizabeth K. Mahony +13
In this pilot study, we use data from the First Large Absorption Survey in HI (FLASH) to search for redshifted HI 21cm absorption at towards 157 bright radio sources with…
One sightline, many systems: a FLASH discovery of HI towards scintillating quasar PKS 0405-385
E. F. Kerrison, H. Yoon, E. M. Sadler +15
We report the discovery of an intervening 21\,cm absorption line at z = 0.882 towards the z = 1.284 quasar PKS 0405-385, identified in the First Large Absorption Survey in HI (FLAS…
The ASKAP-FLASH survey: A first look at the multiwavelength properties and redshift distribution of compact radio sources
W. Roster, E. M. Sadler, E. K. Mahony +15
We present the characterisation, including a photometric redshift (photo-) analysis, of the optical counterparts (CTPs) to over 45 000 bright ( 30 mJy) comp…
VLBI studies of FLASH H I 21-cm absorbers -- I
J. N. H. S. Aditya, Elaine M. Sadler, Raffaella Morganti +9
We have conducted VLBA 1.4 GHz (L-band) continuum observations towards twelve sources with HI 21-cm absorption detections at redshift in the pilot surveys of FLASH, an…
The First Large Absorption Survey in HI (FLASH): II. Pilot Survey data release and first results
Hyein Yoon, Elaine M. Sadler, Elizabeth K. Mahony +41
The First Large Absorption Survey in HI (FLASH) is a large-area radio survey for neutral hydrogen in the redshift range 0.4<z<1.0, using the 21cm HI absorption line as a probe of c…
The FLASH pilot survey: an HI absorption search against MRC 1-Jy radio sources
J. N. H. S. Aditya, Hyein Yoon, James R. Allison +16
We report an ASKAP search for associated HI 21-cm absorption against bright radio sources from the Molonglo Reference Catalogue (MRC) 1-Jy sample. The search uses pilot survey data…
An ASKAP survey for HI absorption towards dust-obscured quasars
M. Glowacki, J. R. Allison, V. A. Moss +11
Obscuration of quasars by accreted gas and dust, or dusty intervening galaxies, can cause active galactic nuclei (AGN) to be missed in optically-selected surveys. Radio observation…
Ionisation of the atomic gas in redshifted radio sources
S. J. Curran, R. W. Hunstead, H. M. Johnston +4
We report the results of a survey for HI 21-cm absorption at z < 0.4 in a new sample of radio sources with the Giant Metrewave Radio Telescope. Of the 11 sources for which there ar…
WALLABY Early Science - II. The NGC 7232 galaxy group
K. Lee-Waddell, B. S. Koribalski, T. Westmeier +19
We report on neutral hydrogen (HI) observations of the NGC 7232 group with the Australian Square Kilometre Array Pathfinder (ASKAP). These observations were conducted as part of th…
PKSB1740-517: An ALMA view of the cold gas feeding a distant interacting young radio galaxy
J. R. Allison, E. K. Mahony, V. A. Moss +12
Cold neutral gas is a key ingredient for growing the stellar and central black hole mass in galaxies throughout cosmic history. We have used the Atacama Large Millimetre Array (ALM…
A search for the host galaxy of FRB171020
Elizabeth K. Mahony, Ron D. Ekers, Jean-Pierre Macquart +11
We report on a search for the host galaxy of FRB171020, the fast radio burst with the smallest recorded dispersion measure (DM pc cm) of our on-ongoing ASKAP survey.…
Further Observational Evidence for a Critical Ionising Luminosity in Active Galaxies
S. J. Curran, R. W. Hunstead, H. M. Johnston +4
We report the results of a survey for HI 21-cm absorption at redshifts of z > 2.6 in a new sample of radio sources with the Green Bank and Giant Metrewave Radio Telescopes. From a…
Connecting X-ray absorption and 21cm neutral hydrogen absorption in obscured radio AGN
V. A. Moss, J. R. Allison, E. M. Sadler +22
Many radio galaxies show the presence of dense and dusty gas near the active nucleus. This can be traced by both 21cm HI absorption and soft X-ray absorption, offering new insight…
H2O Southern Galactic Plane Survey (HOPS): Paper III - Properties of Dense Molecular Gas across the Inner Milky Way
S. N. Longmore, A. J. Walsh, C. R. Purcell +22
The H2O Southern Galactic Plane Survey (HOPS) has mapped 100 square degrees of the Galactic plane for water masers and thermal molecular line emission using the 22-m Mopra telescop…
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…
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…
The H2O southern Galactic Plane Survey(HOPS): NH3 (1,1) and (2,2) catalogues
C. R. Purcell, S. N. Longmore, A. J. Walsh +19
The H2O Southern Galactic Plane Survey (HOPS) has mapped a 100 degree strip of the Galactic plane (-70deg > l > 30deg, |b| < 0.5deg) using the 22-m Mopra antenna at 12-mm wavelengt…
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…