-
Cathryn Trott (ICRAR - Curtin University)07/12/2022, 08:50EoR
-
Zhenghao Zhu07/12/2022, 09:05EoR
The removal of strong foreground contamination is one of the primary challenges for detecting the redshifted 21cm signal from the Epoch of Reionization (EoR). An end-to-end simulation that mimics a realistic astrophysical foreground, as well as the observational and instrumental effects, is necessary to develop and justify various pipelines of detection of the 21cm signal from EoR. In this...
Go to contribution page -
Dev Null (Curtin)07/12/2022, 09:25EoR
There are many ways in which systematics can manifest within a radio telescope signal chain. Some are easily understood and trivial to mitigate, while others can compromise data quality in subtle ways if they evade detection. An extensive ecosystem of tools has been built around the detection of various kinds of defects, each with its own strengths and flaws.
The MWA EoR group has...
Go to contribution page -
Chenoa Tremblay07/12/2022, 10:10GEG
-
Tamsyn O'Beirne (ICRAR)07/12/2022, 10:30GEG
We revisit prior work on the 200 MHz local radio luminosity function (RLF) to produce the most accurate measurement to date. We combine the low-frequency (70 − 230 MHz) Galactic and Extragalactic Murchison Widefield Array (GLEAM) survey with the 6dFGS spectroscopic survey. We build on recent work (Franzen et al., 2021b) by (a) including source previously excluded (‘A-Team’ radio sources and...
Go to contribution page -
Kathryn Ross (ICRAR - Curtin University)07/12/2022, 10:50GEG
The GaLactic and Extragalactic All-sky MWA eXtended(GLEAM-X) survey boasts twice the resolution and up to an order of magnitude higher sensitivity to its predecessor the GLEAM survey. In 2020, observations for GLEAM-X were completed and the first data release was published earlier this year covering 2,000 square degrees down to an RMS noise level of <1.5 mJy/beam. The team is now working on...
Go to contribution page -
Divya Oberoi (National Centre for Radio Astrophysics, Pune India)07/12/2022, 13:00SHI
It has been an exciting year for the solar science group of the MWA. We have had significant developments on both fronts - developing novel calibration and imaging alogrithms and pipelines, as well as using them to pursure novel science. On the techniques front the sperctro-polarimetric snapshot images from our pipeline now defines the state-of-the-art and achieve polarisation purity on par...
Go to contribution page -
Surajit Mondal (New Jersey Institute of Technology)07/12/2022, 13:25SHI
Observations spanning across wavelengths ranging from X-rays, Extreme Ultraviolet, optical and radio bands have demonstrated that copious amounts of nonthermal particles are generated during solar flares. Numerical simulations have also become more and more realistic and for the first time produced nonthermal particle spectra consistent with observations. However most observations of these...
Go to contribution page -
Soham Dey (National Centre for Radio Astrophysics)07/12/2022, 13:45Polarimetry
Magnetic reconnection is a well-known process for the acceleration of electrons in the solar corona. When streams of semi-relativistic electrons travel through the hot magnetized coronal plasma along open magnetic field lines, it can result in type-III solar radio bursts by plasma emission mechanism. These radio emissions are among the most widely studied solar phenomenon at meter-wavelength....
Go to contribution page -
Puja Majee (National Centre for Radio Astrophysics)07/12/2022, 14:15Polarimetry
Type II solar radio bursts are well known to be predominantly associated with the more energetic and fast coronal mass ejections (CMEs). These CMEs are expected to drive shocks in the coronal medium and play a dominant role in giving rise to energetic particles which are the biggest concern for Space Weather. Type II radio bursts arise from plasma emission mechanisms and occur at fundamental...
Go to contribution page -
Devojyoti Kansabanik (National Centre for Radio Astrophysics - Tata Institute of Fundamental Research, Pune, India)07/12/2022, 14:50SHI
Low-frequency radio observations have been expected to serve as a powerful tool for Space Weather observations for decades. This is because (1) radio observations are sensitive to a wide range of Space Weather-related observations ranging from emissions from coronal mass ejections (CMEs) to studies of the solar wind; and (2) the ground-based radio observatories provide high sensitivity data at...
Go to contribution page -
Angelica Waszewski (ICRAR - Curtin University)07/12/2022, 15:10SHI
Our current understanding of coronal mass ejections, as well as other solar events in interplanetary space, is well-developed to forecast the effects on Earth. However, it is still insufficient in its ability to predict the evolution of these events with a high degree of accuracy. Considering that a major space weather event could put crucial technologies at risk, predicting the severity of...
Go to contribution page -
Sam McSweeney (CIRA, Curtin University)08/12/2022, 08:00Polarimetry
Calibrating the MWA as a dual-polarised instrument is notoriously difficult, evidenced by the fact that even our latest beam models and calibration algorithms produce solutions that demonstrably contain frequency-dependent phase errors between the two polarisations. In this talk, I will present an overview of the basic problem using a combination of intuitive and mathematical arguments, and...
Go to contribution page -
Steve Prabu (Curtin University)08/12/2022, 08:30Transients
Typical radio-interferometer observations are performed assuming the source of radiation to be in the far-field of the instrument, resulting in a Fourier relationship between the observed visibilities in the aperture plane and the sky brightness distribution. When such observations are performed of events in the near-field, radiation with curved wavefronts are correlated with far-field delays...
Go to contribution page -
Danny Price (ICRAR/Curtin)08/12/2022, 08:50Transients
The MWA, like many radio array telecopes, uses Ethernet packets to route data from the receiver 'frontend' to the MWAX correlator 'backend'. Using a routing feature called Multicast, these data packets can be sent to any backends that request a copy of the datastream. Here, we report on the commensal MWA beamformer system: a collaboration between ICRAR researchers and the Breakthrough Listen...
Go to contribution page -
08/12/2022, 09:55VCS/PFT
-
Ramesh Bhat (Dr)08/12/2022, 10:00VCS/PFT
-
Bradley Meyers (Curtin University)08/12/2022, 10:30VCS/PFT
The Southern-sky MWA Rapid Two-metre (SMART) pulsar survey is an ambitious project, with prospects of discovering hundreds of new pulsars, and will be a valuable prototype for future SKA-Low pulsar surveys. Now that the first ("shallow") stage processing of SMART data is nearing completion, we have started planning for the full survey processing workflow in earnest. I will present our current...
Go to contribution page -
Jun Tian08/12/2022, 10:50VCS/PFT
In this talk, I will present a targeted search for low-frequency (144--215MHz) FRB emission from five repeating FRBs using 23.3hr of archival data taken with the Murchison Widefield Array (MWA) Voltage Capture System (VCS) between 2014 September and 2020 May. This is the first time that the MWA VCS has been used to search for FRB signals from known repeaters, which enables much more sensitive...
Go to contribution page -
Parul Janagal (Indian Institute of Technology Indore (India))08/12/2022, 11:10VCS/PFT
Pulsars are excellent astrophysical laboratories for studying physics under extreme conditions such as ultra-strong gravitational and magnetic fields. Admittedly, after five decades since their discovery, physical processes governing their emission mechanism remain poorly understood. PSR J0026-1955, which was independently discovered by the MWA (McSweeney et al. 2022), exhibits unusual...
Go to contribution page -
Susmita Sett08/12/2022, 11:30VCS/PFT
Pulsars have been studied extensively over the last few decades and have proven instrumental in exploring a wide variety of physics. Discovering more pulsars emitting at low radio frequencies is crucial to further our understanding of spectral properties and emission mechanisms. The Murchison Widefield Array Voltage Capture System (MWA VCS) has been routinely used to study pulsars at low...
Go to contribution page
Choose timezone
Your profile timezone: