A5013632001- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- GNSS positioning and interference
- Statistical and numerical algorithms
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Particle Accelerators and Free-Electron Lasers
- Geophysics and Gravity Measurements
- Magnetic confinement fusion research
- SAS software applications and methods
- Hemophilia Treatment and Research
- Geotechnical Engineering and Underground Structures
- Spectroscopy and Chemometric Analyses
- IoT and GPS-based Vehicle Safety Systems
- Brain Tumor Detection and Classification
- Neurological Disorders and Treatments
- Infrastructure Maintenance and Monitoring
- Leaf Properties and Growth Measurement
- Ionosphere and magnetosphere dynamics
- Particle physics theoretical and experimental studies
- IoT-based Smart Home Systems
- Artificial Intelligence in Healthcare
Weizmann Institute of Science
2023-2024
Rajalakshmi Engineering College
2024
Swinburne University of Technology
2019-2023
We present the discovery of as-of-yet non-repeating Fast Radio Burst (FRB), FRB 20210117A, with Australian Square Kilometer Array Pathfinder (ASKAP) as a part Commensal Real-time ASKAP Transients (CRAFT) Survey. The sub-arcsecond localization burst led to identification its host galaxy at $z=0.214(1)$. This redshift is much lower than what would be expected for source dispersion measure (DM) 729 pc cm$^{-3}$, given typical contributions from intergalactic medium and galaxy. Optical...
The fast radio burst (FRB) population is observationally divided into sources that have been observed to repeat and those not. There tentative evidence the bursts from repeating different properties than non-repeating ones. In order determine occurrence rate of characterize nature emission, we conducting sensitive searches for repetitions detected with Australian Square Kilometre Array Pathfinder (ASKAP) 64-m Parkes telescope, using recently commissioned Ultra-wideband Low (UWL) receiver...
ABSTRACT The mechanism that produces fast radio burst (FRB) emission is poorly understood. Targeted monitoring of repeating FRB sources provides the opportunity to fully characterize properties in a manner impossible with one-off bursts. Here, we report observations source 20201124A, Australian Square Kilometre Array Pathfinder (ASKAP) and ultra-wideband low (UWL) receiver at Parkes 64-m telescope (Murriyang). entered period emitting bright bursts during early 2021 April. We have detected 16...
We report the detection of repeat bursts from source FRB 171019, one brightest fast radio (FRBs) detected in Australian Square Kilometre Array Pathfinder (ASKAP) fly's eye survey. Two were with Green Bank Telescope observations centered at 820 MHz. The repetitions are a factor $\sim 590$ fainter than ASKAP-discovered burst. All three this show no evidence scattering and have consistent pulse widths. spectra modulation that could be for either steep or patchy emission. two only ones found an...
ABSTRACT We present the discovery of FRB 20210410D with MeerKAT radio interferometer in South Africa, as part MeerTRAP commensal project. has a dispersion measure DM = 578.78 ± 2 ${\rm pc \, cm^{-3}}$ and was localized to subarcsec precision s images made from correlation data products. The localization enabled association an optical galaxy at z 0.1415, which when combined places it above 3σ scatter Macquart relation. attribute excess host after accounting for contributions Milky Way’s...
The Parkes Pulsar Timing Array (PPTA) project monitors two dozen millisecond pulsars (MSPs) in order to undertake a variety of fundamental physics experiments using the 64m radio telescope. Since June 2017 we have been undertaking commensal searches for fast bursts (FRBs) during MSP observations. Here, report discovery four FRBs (171209, 180309, 180311 and 180714). detected events include an FRB with highest signal-to-noise ratio ever at observatory, which exhibits unusual spectral...
A handful of fast radio bursts (FRBs) are now known to repeat. However, the question remains --- do they all? We report on an extensive observational campaign with Australian Square Kilometre Array Pathfinder (ASKAP), Parkes, and Robert C. Byrd Green Bank Telescope, searching for repeat from FRBs detected by Commensal Real-time ASKAP Fast Transients survey. In 383.2 hr follow-up observations covering 27 initially as single bursts, only two a FRB, FRB 171019, were detected, which have been...
The study of impulsive astrophysical radio emission makes it possible to probe the intervening plasma between source and Earth. In cold electron-ion plasmas, circular propagating wave modes primarily alter linear polarization plane that scales with inverse-square frequency. relativistic are elliptically polarized, is convert linearly polarized into vice versa. Fast bursts (FRBs) enable not only intergalactic medium but potentially extreme magneto-ionic in which these intense pulses produced....
Abstract The putative host galaxy of FRB 20171020A was first identified as ESO 601-G036 in 2018, but no repeat bursts have been detected, direct confirmation the remains elusive. In light recent developments field, we re-examine this and determine a new association confidence level 98%. At 37 Mpc, makes third closest to be date an apparently non-repeating (with estimated repetition rate limit $<$ $0.011$ per day above $10^{39}$ erg). Due its close distance, are able perform detailed...
ABSTRACT As the sample size of repeating fast radio bursts (FRBs) has grown, an increasing diversity phenomenology emerged. Through long-term multi-epoch studies FRBs, it is possible to assess which phenomena are common population and unique individual sources. We present a monitoring campaign FRB source 20180301A using ultra-wideband low (UWL) receiver observations with Murriyang, Parkes 64-m telescope. The covered wide frequency band spanning approximately 0.7–4 GHz, yielded detection 46...
We present the Australian Square Kilometre Array Pathfinder (ASKAP) localization and follow-up observations of host galaxy repeating fast radio burst (FRB) source, FRB20201124A, fifth such extragalactic FRB with an identified host. From spectroscopic using 6.5-m MMT Observatory, we derive a redshift $z=0.0979 \pm 0.0001$, star formation rate inferred from H$\alpha$ emission SFR(H$\alpha$) $\approx 2.1 M_{\odot}$ yr$^{-1}$, gas-phase metallicity 12+log(O/H)$\approx 9.0$. By jointly modeling...
Abstract Detecting fast radio bursts (FRBs) with frequency-dependent intensity remains a challenge, as existing search algorithms do not account for the spectral shape, potentially leading to nondetections. We propose novel detection statistic, which we call Kalman detector, that improves sensitivity of FRB signal by incorporating shape information. The statistic is based on an optimal matched filter, marginalizing over all possible functions, weighted random walk probability distribution,...
Fast Radio Bursts (FRBs) are short-timescale transients of extragalactic origin. The number detected FRBs has grown dramatically since their serendipitous discovery from archival data. Some have also been seen to repeat. polarimetric properties repeating show diverse behaviour and, at times, extreme morphology, suggesting a complex magneto-ionic circumburst environment for this class FRB. such as circular polarisation crucial understanding surrounding magnetic-ionic environment. previously...
Abstract Fast Radio Bursts (FRBs) are short-timescale transients of extragalactic origin. The number detected FRBs has grown dramatically since their serendipitous discovery from archival data. Some have also been seen to repeat. polarimetric properties repeating show diverse behaviour and, at times, extreme morphology, suggesting a complex magneto-ionic circumburst environment for this class FRB. such as circular polarisation crucial understanding surrounding magnetic-ionic environment....
Abstract The discovery of many repeating fast radio bursts (FRBs) by the Canadian Hydrogen Intensity Mapping Experiment, high rate individual bursts, and observation repeat from a bright FRB initially detected Australian Square Kilometre Array Pathfinder (ASKAP) suggest significant population FRBs. Here, we analyze distribution this using results follow-up observations Commensal Real-time ASKAP Fast Transients Survey. Characterizing its burst R 0 above an energy 10 38 erg, consider...
This paper presents a detailed investigation into the implementation of face recognition techniques to enhance attendance management by employing combination diverse sensors. The proposed system aims optimize tracking leveraging advantages traditional documentation alongside contemporary technology. primary goal is create an efficient, secure, user-friendly, and unobtrusive solution that integrates strengths both conventional modern approaches. Through this synergistic approach, seeks...
Hospitals are using online recommender systems more and frequently. Nowadays, the vast majority of consumers research potential prescriptions before consulting their doctors for a variety medical issues. When pandemics, floods, occur, recommendation system may come in handy. Using fewer resources, provide precise, dependable, accurate clinical predictions. The patient receives trustworthy information regarding medication, dose, side effects from medication system. patient's symptoms taken...
The study of impulsive astrophysical radio emission makes it possible to probe the intervening plasma between source and Earth. In cold electron-ion plasmas, circular propagating wave modes primarily alter linear polarization plane that scales with inverse-square frequency. relativistic are elliptically polarized, is convert linearly polarized into vice versa. Fast bursts (FRBs) enable not only intergalactic medium but potentially extreme magneto-ionic in which these intense pulses produced....