A5037260707- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Pulsars and Gravitational Waves Research
- Atmospheric and Environmental Gas Dynamics
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Polar Research and Ecology
- Climate variability and models
- Radio Astronomy Observations and Technology
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Methane Hydrates and Related Phenomena
- Arctic and Antarctic ice dynamics
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Tree-ring climate responses
- Superconducting and THz Device Technology
- Catalytic Processes in Materials Science
- Marine and coastal ecosystems
- Pleistocene-Era Hominins and Archaeology
- Microbial Community Ecology and Physiology
- Geological formations and processes
- Particle Accelerators and Free-Electron Lasers
- Winter Sports Injuries and Performance
Commonwealth Scientific and Industrial Research Organisation
2013-2023
Australian Antarctic Division
2022-2023
University of Tasmania
2022-2023
CSIRO Oceans and Atmosphere
2017-2022
University of Manchester
2012-2018
Australia Telescope National Facility
2013-2016
Astronomy and Space
2013-2016
Max Planck Institute for Radio Astronomy
2013
University of California, Berkeley
1995
Searches for transient astrophysical sources often reveal unexpected classes of objects that are useful physical laboratories. In a recent survey pulsars and fast transients we have uncovered four millisecond-duration radio all more than 40{\deg} from the Galactic plane. The bursts' properties indicate they celestial rather terrestrial origin. Host galaxy intergalactic medium models suggest cosmological redshifts 0.5 to 1, distances up 3 gigaparsecs. No temporally coincident x- or gamma-ray...
Abstract The detection of five new fast radio bursts (FRBs) found in the 1.4-GHz High Time Resolution Universe high-latitude survey at Parkes, is presented. rate implied 7$^{+5}_{-3}\times 10^3$ (95 per cent) FRBs sky−1 d−1 above a fluence 0.13 Jy ms for an FRB 0.128 duration to 1.5 16 duration. One these has two-component profile, which each component similar known population single and two components are separated by 2.4 ± 0.4 ms. All appear be unresolved following deconvolution with...
The future response of the Antarctic ice sheet to rising temperatures remains highly uncertain. A useful period for assessing sensitivity Antarctica warming is Last Interglacial (LIG) (129 116 ky), which experienced warmer polar and higher global mean sea level (GMSL) (+6 9 m) relative present day. LIG cannot be fully explained by Greenland Ice Sheet melt (∼2 m), ocean thermal expansion, melting mountain glaciers (∼1 suggesting substantial mass loss was initiated Southern Ocean waters,...
Abstract. Ice core records of the major atmospheric greenhouse gases (CO2, CH4, N2O) and their isotopologues covering recent centuries provide evidence biogeochemical variations during Late Holocene pre-industrial periods over transition to industrial period. These come from a number ice firn air sites have been measured in several laboratories around world show common features but also unresolved differences. Here we present revised records, including new measurements, performed at CSIRO...
We present 75 pulsars discovered in the mid-latitude portion of High Time Resolution Universe survey, 54 which have full timing solutions. All spin periods greater than 100 ms, and none those with solutions is binaries. Two display particularly interesting behaviour; PSR J1054−5944 found to be an intermittent pulsar, J1809−0119 has glitched twice since its discovery.
We have used millisecond pulsars (MSPs) from the southern High Time Resolution Universe (HTRU) intermediate latitude survey area to simulate distribution and total population of MSPs in Galaxy. Our model makes use scalefactor method, which estimates ratio number Galaxy known sample. Using our best-fitting value for z-height, z = 500 pc, we find an underlying 8.3(±4.2) × 104 sources down a limiting luminosity Lmin 0.1 mJy kpc2 with steep slope d log N/d L −1.45 ± 0.14. However, at low end...
Fast radio bursts (FRBs) are an emerging class of bright, highly dispersed pulses. Recent work by Thornton et al. (2013) has revealed a population FRBs in the High Time Resolution Universe (HTRU) survey at high Galactic latitudes. A variety progenitors have been proposed including cataclysmic events cosmological distances, flare stars, and terrestrial frequency interference. Here we report on search for intermediate latitudes ($-15^{\circ}$ $< b <$ 15$^{\circ}$) data taken as part HTRU...
Abstract Reconstructing the dynamic response of Antarctic ice sheets to warming during Last Glacial Termination (LGT; 18,000–11,650 yrs ago) allows us disentangle ice-climate feedbacks that are key improving future projections. Whilst sequence events this period is reasonably well-known, relatively poor chronological control has precluded precise alignment ice, atmospheric and marine records, making it difficult assess relationships between ice-sheet (AIS) dynamics, climate change sea level....
We present the discovery of a further five recycled pulsar systems in mid-Galactic latitude portion High Time Resolution Universe survey. The pulsars have rotational periods ranging from 2 to 66 ms, and four are binary with orbital between 10.8 h 9 d. Three these particularly interesting; PSR J1227−6208 has pulse period 34.5 ms highest mass function all near-circular orbits. circular orbit suggests that companion is not another neutron star, so future timing experiments may reveal one...
Fast radio bursts (FRBs) are millisecond pulses of emission seemingly extragalactic origin. More than 50 FRBs have now been detected, with only one seen to repeat. Here we present a new FRB discovery, 110214, which was detected in the high-latitude portion High Time Resolution Universe South survey at Parkes telescope. 110214 has lowest dispersion measures any known (DM = 168.8 ± 0.5 pc cm−3), and two beams multibeam receiver. A triangulation burst origin on sky identified three possible...
This paper presents the discovery and timing parameters for five millisecond pulsars (MSPs), four in binary systems with probable white dwarf companions one isolated, found ongoing processing of High Time Resolution Universe Pulsar Survey (HTRU). We also present high quality polarimetric data on them. These further discoveries confirm potential our survey finding very short spin periods. At least two these MSPs are excellent candidates to be included Timing Array projects. Thanks wealth MSP...
We present a polarimetric analysis of 49 long-period pulsars discovered as part the High Time Resolution Universe (HTRU) southern survey. The sources exhibit typical characteristics 'old' pulsars, with low fractional linear and circular polarization narrow, multi-component profiles. Although position angle swings are generally complex, for two analysed (J1622−3751 J1710−2616) we obtained an indication geometry via rotating vector model. were able to determine value rotation measure (RM) 34...
Abstract. Here we present a newly developed ice core gas-phase proxy that directly samples component of the large-scale atmospheric circulation: synoptic-scale pressure variability. Surface changes weakly disrupt gravitational isotopic settling in firn layer, which is recorded krypton-86 excess (86Krxs). The 86Krxs may therefore reflect time-averaged synoptic variability over several years (site “storminess”), but it likely cannot record individual events as gas typically average years. We...
Abstract. Ice core records of the major atmospheric greenhouse gases (CO2, CH4, N2O) and their isotopologues covering recent centuries provide evidence biogeochemical variations during Late-Holocene Pre-Industrial Periods over transition to Industrial Period. These come from a number ice firn air sites, have been measured in several laboratories around world show common features, but also unresolved differences. Here we present revised records, including new measurements, performed at CSIRO...
Platinum alloys supported on specially prepared alloy steel ribbons and formed into mat-like beds of various shapes sizes have been developed for the flameless combustion fumes from industrial processes. This article describes a number typical installations employing catalytic elements to eliminate objectionable vapours so avoid pollution atmosphere.
The future response of the Antarctic ice sheets to rising temperatures remains highly uncertain. A valuable analogue for assessing sensitivity Antarctica warming is Last Interglacial (129-116 kyr), when global sea level peaked 6 9 meters above present. Here we report a blue-ice record ice-sheet and environmental change from periphery marine-based West Ice Sheet (WAIS). Constrained by widespread volcanic horizon supported ancient microbial DNA analyses, provide first direct evidence WAIS...