Introduction to the data portal
Browsing observations and utilizing the TAP service
Submitting and managing jobs and data
Various services provided:
Web interface
Command line clients
Virtual Observatory (VO) TAP Service
Processed MWA Data
Data collections and delivery options
Priority assignment for users downloading data
Tips and tricks for efficient data exploration
For the first part of my talk, I will be focusing on different radio frequency interference (RFI) mitigation techniques currently being developed at Brown University and the University of Washington. At Brown, my home institution, our group's efforts are directed towards developing both traditional and machine learning (ML) algorithms to detect RFI for MWA data. On the traditional side, we...
In this presentation I will briefly update the collaboration on the MWA Archive, MWA ASVO and systems.
The Shanghai Observatory of China(SHAO) and MWA have collaborated on the development of Phase III digital receivers. The on-site installation of the prototype has been completed and observation testing is currently underway. This report will introduce the functional requirements, hardware and software design, related test results of this digital receiver. And some other digital backends based...
2024-25 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 algorithms and pipelines and using them to pursue novel science. On the techniques front, we have made strides towards making state-of-the-art spectro-polarimetric snapshot images and are working towards automating this...
This talk presents a cost feasible remote sensing solution that we have developed to aid and improve the calibration of Murchison Widefield Array (MWA) measurements for ionospheric errors using small satellites. For polarimetry, a crucial step in the calibration of MWA measurements involves removing the polarization error due to ionospheric Faraday rotation (FR) with a sufficiently high...
The plasma bubble where the density of the ionosphere is low caused due to the Rayleigh–Taylor instability. As the low-density region contains a small-scale structure, the variation of total electron content (TEC) is a good indicator of a plasma bubble. The TEC data observed by the Global Navigation Satellite Systems (GNSS) shows plasma bubbles propagated to Western Australia from the...
Square Kilometer Array (SKA) will provide unprecedented quality data for solar sciences and space weather. Understanding space weather is vital for human space endeavours and territorial existence by avoiding space-based catastrophes. The Sun is a plasma laboratory capturing a variety of plasma parameters and plays a pivotal role in space weather. Thus, solar activity, including eruptions like...
Interplanetary scintillation (IPS) is the variability of compact radio sources caused by turbulence in the solar wind. IPS is a fantastic space weather tool as it is able to measure the solar wind density along any line of sight an arbitrary distance from the Sun, giving it unlimited reign to probe the entire heliosphere.
By adapting this technique for modern low-frequency instruments such as...
We present the latest EoR power spectrum results from an initial set of 650 hours from the EoR0 high-band data from 2013-2023. Using the new Hyperdrive calibration software, and a set of QA metrics and thresholds developed by the Australia-based EoR team, and implemented through an efficient Nextflow pipeline, we arrive at a final integration with a subset of the cleanest data. The latest...
Measurement of the 21 cm emission of neutral hydrogen in the intergalactic medium probes the era of the first luminous objects and the era of the intergalactic medium becoming fully ionized by the first stars, the Epoch of Reionization (EoR). However, the 21 cm signal is orders of magnitude fainter than astrophysical foregrounds, as well as other sources of radio frequency interference, making...
The next generation radio interferometry experiments will be sensible enough not only to detect the 21-cm signal but they will be able to map the distribution of neutral hydrogen during reionization and produce a tremendous amount of 3D tomographic data. The biggest challenge for the observational analysis of these images is to separate the 21-cm signal from the undesired foreground and...
Deep imaging of the structures of the epoch of reionization (EoR) over five targeted fields is selected as one of the highest priority science objective for SKA1. Selecting the ‘clean’ fields is important for the future SKA CD/EoR observations, and pre-observations of the candidate fields with the current radio facilities can help us estimating the computing capabilities to be required for...
21 cm Intensity Mapping probes the universe using the spin-flip transition of the neutral hydrogen atom. This cosmological probe has enormous potential to unravel the nature of our cosmos. Multiple next-generation radio instruments such as the Low-Frequency Array (LOFAR)[1], the Murchison Widefield Array (MWA)[2] and the proposed Square Kilometer Array (SKA)[3] are either currently attempting...
The phenomenon of pulsar nulling, where pulsars temporarily and stochastically cease their radio emission, is thought to be indicative of a `dying' pulsar, where radio emission ceases entirely. Here we report the discovery of a long-period pulsar, PSR J0452-3418, from the ongoing Southern-sky MWA Rapid Two-meter (SMART) pulsar survey.
The pulsar exhibits both sub-pulse drifting and...
Fast Radio Bursts (FRBs) are millisecond dispersed radio pulses of predominately extra-galactic origin. Despite hundreds of FRBs discovered at frequencies above 400 MHz, only a few were discovered below 400 MHz. One of the reasons is computational complexity of low-frequency FRB searches over wide fields of view (hundreds or thousands of square degrees) and long dispersion delays (of the order...
Millisecond pulsars (MSPs) are exquisite astrophysical tools which provide unique opportunities to advance fundamental physics. The MWA is playing an important role in preparing for SKA science, having recently completed data collection for the Southern-sky MWA Rapid Two-metre (SMART) pulsar survey. With a dwell time of 4800 s and high time/frequency resolutions, SMART will be the most...
I will discuss the current challenges in connecting simulations and observations of tidal disruption events, which are a novel, key multi-messenger probe of astrophysical black holes and their environments. I will then focus on the exciting prospect to use radio observations by MWA to shed new light on the physical nature of TDEs. Such observations would be complementary to others already...
