A5031410055- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Geophysics and Gravity Measurements
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Calibration and Measurement Techniques
- Adaptive optics and wavefront sensing
- Solar and Space Plasma Dynamics
- Radio Wave Propagation Studies
- Methane Hydrates and Related Phenomena
- Science Education and Perceptions
- Statistical and numerical algorithms
- Career Development and Diversity
- Gender Diversity and Inequality
International Centre for Radio Astronomy Research
2020-2024
Curtin University
2020-2024
Abstract We describe a new low-frequency wideband radio survey of the southern sky. Observations covering 72–231 MHz and Declinations south $+30^\circ$ have been performed with Murchison Widefield Array “extended” Phase II configuration over 2018–2020 will be processed to form data products including continuum polarisation images mosaics, multi-frequency catalogues, transient search data, ionospheric measurements. From pilot field described in this work, we publish an initial release 1,447...
We have conducted a widefield, wideband, snapshot survey using the Australian SKA Pathfinder (ASKAP) referred to as Rapid ASKAP Continuum Survey (RACS). RACS covers $\approx$ 90% of sky, with multiple observing epochs in three frequency bands sampling range 700 1800 MHz. This paper describes third major epoch at 1655.5 MHz, RACS-high, and subsequent imaging catalogue data release. The RACS-high observations MHz are otherwise similar previously released RACS-mid (at 1367.5 MHz), were...
ABSTRACT Spectral variability of radio sources encodes information about the conditions intervening media, source structure, and emission processes. With new low-frequency interferometers observing over wide fractional bandwidths, studies spectral for a large population extragalactic are now possible. Using two epochs observations from GaLactic Extragalactic All-sky Murchison Widefield Array (GLEAM) survey that were taken one year apart, we search across 100–230 MHz 21 558 sources. We...
Abstract We present the second data release for GaLactic and Extragalactic All-sky Murchison Widefield Array eXtended (GLEAM-X) survey. This is an area of 12 892-deg $^2$ around South Galactic Pole region covering 20 h40 m $\leq$ RA 6 m, -90 $^\circ$ Dec +30 . Observations were taken in 2020 using Phase-II configuration (MWA) a frequency range 72–231 MHz with twenty bands. produce wideband source finding mosaic over 170–231 median root-mean-squared noise $1.5^{+1.5}_{-0.5}$ mJy beam $^{-1}$...
Characterising spectral variability of radio sources is a technique that offers the ability to determine astrophysics intervening media, source structure, emission and absorption processes. We present broadband (0.072--10 GHz) 15 peaked-spectrum (PS) with Australia Telescope Compact Array (ATCA) Murchison Widefield (MWA). These PS were observed quasi-contemporaneously ATCA MWA four six times during 2020 approximately monthly cadence. Variability was not detected at 1--10GHz frequencies but...
The visibility of female role models in science is vital for engaging and retaining women scientific fields. In this study, we analyse four senior secondary courses delivered across the states territories Australia: Biology, Chemistry, Environmental Science, Physics. We compared male representation within by examining mentions scientists along with context their inclusions syllabuses. find a clear gender bias only one unique mention scientist. also Eurocentric focus narrow scientists. This...
Abstract Spectral variability offers a new technique to identify small scale structures from scintillation, as well determining the absorption mechanism for peaked-spectrum (PS) radio sources. In this paper, we present very long baseline interferometry (VLBI) imaging using array (LBA) of two PS sources, MRC 0225–065 and PMN J0322–4820, identified spectrally variable observations with Murchison Widefield Array (MWA). We compare expected milliarcsecond based on detected spectral direct LBA...
Abstract The bright radio source, GLEAM J091734 $-$ 001243 (hereafter J0917 0012), was previously selected as a candidate ultra-high redshift ( $z \gt 5$ ) galaxy due to its compact size and faint magnitude $K(\mathrm{AB})=22.7$ ). Its not conclusively determined from follow-up millimetre near-infrared spectroscopy. Here we present new HST WFC3 G141 grism observations which reveal several emission lines including [NeIII] $\lambda$ 3867, [NeV] 3426 an extended $\approx 4.8\,$ kpc), [OII] 3727...
The angular correlation is a method for measuring the distribution of structure in Universe, through statistical properties galaxies on sky. We measure from second data release GaLactic and Extragalactic All-sky Murchison Widefield Array eXtended survey (GLEAM-X) survey, low-frequency radio covering declinations below +30 degrees. find an consistent with LambdaCDM cosmological model assuming best fitting parameters Planck Collaboration et al. (2020). fit bias function to discrete tracers...
Abstract The angular correlation is a method for measuring the distribution of structure in Universe, through statistical properties galaxies on sky. We measure from second data release GaLactic and Extragalactic All-sky Murchison Widefield Array eXtended survey (GLEAM-X) survey, low-frequency radio covering declinations below $+30^\circ$ . find an consistent with $\Lambda$ CDM cosmological model assuming best fitting parameters Planck Collaboration et al. (2020, A&A, 641, A6). fit bias...
The bright radio source, GLEAM J091734-001243 (hereafter J0917-0012), was previously selected as a candidate ultra-high redshift (z>5) galaxy due to its compact size and faint magnitude (K(AB)=22.7). Its not conclusively determined from follow-up millimetre near-infrared spectroscopy. Here we present new HST WFC3 G141 grism observations which reveal several emission lines including [NeIII]3867, [NeV]3426 an extended (~4.8 kpc), [OII]3727 line confirm of 3.004+/-0.001. component the is...