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Showing results for: [ Astronomical and Space Sciences not elsewhere classified ]
Fast radio bursts (FRBs) continue to raise more questions than they answer. Until last year, only one burst – the only one known to repeat - had been localized to a bright radio nebula (either a youn... moreg supernova remnant or pulsar wind nebulae) in a distant dwarf galaxy. Over the last two year searches with the Australian Square Kilometre Array Pathfinder (ASKAP) have detected 31 bursts, five of which have been localised to host galaxies at redshifts ranging from 0.1 to 0.5. These bursts and their hosts are very unlike the repeater, suggesting there may be a dichotomy in the population. However one of the arcminute-localised ASKAP FRBs has recently been found to repeat. Here we propose to search and study repetitions in this FRB population. Our comprehensive sample and a dense monitoring campaign of well localised bursts, at a fluence limit more than 60 times lower than that of their detections to characterise the fraction of bursts that repeat. For bursts that repeat the unique wide bandwidth observations will be used to test leading models of burst emission.less
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 23 Feb 2020
We propose to conduct observations of PSR J1653-45, a 951-ms pulsar in a long, 1.5-yr orbit. Binary pulsars are valuable objects of scientific study, allowing for a wide range of applications, includi... moreng tests of gravity, probes of the neutron star equation of state, and fossil records of stellar evolution. Long spin-period pulsars in binary systems are generally much rarer than faster-spinning `recycled’ pulsars, and represent an under-explored region of pulsar binary evolution. In addition to its long orbital period, PSR J1653-45 also experiences extended eclipses, lasting up to half of the orbital period and whose nature is not well understood. These eclipses have also prevented the determination of an orbital of phase-connected timing solution, both vital steps in allowing for the continued study of this system. We propose a targeted, high-cadence observing campaign designed to monitor this pulsar as it transition into its eclipsing state. The campaign has the twin goals of both monitoring how the eclipse affects the pulsar’s emission properties, thereby revealed more about the nature of the eclipses themselves, and of extracting as much information regarding the pulsar’s orbit during its least-explored regions, thereby constrained and hopefully solving the pulsar’s orbit and ideally leading to the development of a timing solution. In both instances, we hope to gain a greater understanding of this pulsar’s properties and how it fits into this under-explored class of unrecycled pulsar binaries.less
Australia Telescope National Facility - P1021 - Mapping the orbit of an enigmatic 1.5-yr eclipsing binary pulsar. - Published 23 Feb 2020
The Parkes Pulsar Timing Array (PPTA) project has three primary goals: (a) detection of gravitational waves from astronomical sources, (b) establishment of a pulsar timescale, and (c) improvement of o... moreur understanding of Solar-system dynamics. The PPTA is the oldest of three international pulsar timing groups. We have the smallest telescope and the smallest group, but the best measurements and the best results. Our bound on the strength of the incoherent gravitational wave background is the only bound which significantly constrains theoretical models. We have maintained our leading position because: we have the southern sky; we have a small but well-focussed group; we have the best-calibrated receivers; and we have been able to observe with an almost regular cadence of 15 to 20 days over a wide bandwidth. With this proposal we aim to maintain our pre-eminent position in the field. Unlike most observing proposals, this is a continuing proposal for which the observations will continue to improve bounds on ultra-low-frequency gravitational waves until they are finally detected. Continued Parkes observations will remain valuable at least until the first stage of the SKA is able to improve on our sensitivity and observing cadence. Even after the gravitational wave background is detected we will want to continue observations in support of the nascent field of gravitational wave astronomy!less
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 23 Feb 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 22 Feb 2020
We propose timing observations of the relativistic pulsar - white-dwarf binary PSR J1141-6545. This unique system offers access to a wide range of physics, from relativistic phenomena through pulsar e... moremission cone studies, to the structure and distribution of interstellar plasma along our line-of-sight. The recently installed Parkes Ultra Wide Band Low Frequency (UWL) receiver has opened up the possibility of performing first-ever studies of its orbital dynamics at high temporal resolution and study of the effects of the intra-binary medium on the dispersion and polarisation of the pulse profile. Our analysis of data obtained to date suggests that the pulsar would precess away from our line-of-sight in the next 3-5 years. Hence, regular observations are crucial to maximizing its science outcomeless
Australia Telescope National Facility - P971 - Orbital dynamics and the intra-binary medium of PSR J1141-6545 - Published 22 Feb 2020
The aim of this proposal is to carry out tests of the new backend instruments which cannot be carried out during standard maintenance periods. The scheduled time is used to measure beam shapes, deter... moremine polarisation calibration solutions and commission the National Facility observing modes for the new wide-band receiver.less
Australia Telescope National Facility - P737 - Commissioning the pulsar backends at Parkes - Published 22 Feb 2020
We propose to continue the PULSE@Parkes project in which high school students from Australia and around the World use the Parkes radio telescope in a remote observing model to observe and analyse puls... morear data. The data from some PULSE@Parkes observations are used to support the FERMI Gamma ray mission, other observations supplement the P456 Pulsar Timing Array project and the remainder were chosen in order to make a detailed analysis of pulsar timing irregularities and intermittency.less
Australia Telescope National Facility - P595 - PULSE@Parkes (Pulsar Student Exploration at Parkes) - Published 22 Feb 2020
We propose to carry out Parkes follow-up observations of the new millisecond pulsar, J1431-6328, discovered by the Australian SKA Pathfinder (ASKAP) and Parkes Ultra-Wideband Low (UWL) receiver. The d... moreiscovery demonstrated the power of identifying pulsar candidates in radio continuum images and then following up with high time resolution observations. The discovery itself is also interesting. PSR J1431-6328 has a spin period of 2.77 ms, and is likely to be in a binary system. Follow-up observations will enable us to measure the binary parameters, which will guide future multi-wavelength observations and might shed new lights on the binary evolution. The short spin period, relatively large flux density and sky location of PSR J1431-6328 also make it a promising candidate for pulsar timing arrays. The proposed observations will allow us to obtain a timing solution of this new pulsar, and are therefore essential for future timing observations.less
Australia Telescope National Facility - P1027 - Follow-up of the ASKAP discovery of millisecond pulsar J1431-6328 - Published 21 Feb 2020
This proposal relates to time purchased by the Chinese Academy of Sciences for Parkes follow-up confirmation and timing of FAST discoveries. As the observing time has been purchased this proposal (an... mored the related PX501) does not require TAC grading. The primary reason for submitting a proposal is to ensure an outreach statement and that the proposal is entered into OPAL for the data archive to access. The Chinese team have two time requests. The time scheduled for the first, relating to this proposal, will be allocated in blocks of 24 hours and the data will become available in the data archive with an 18 month embargo period. The second type of time will be scheduled in shorter blocks and the data archived with a 10 year embargo.less
Australia Telescope National Facility - PX500 - FAST: category 1 purchased time - Published 21 Feb 2020
Australia Telescope National Facility - P595 - PULSE@Parkes (Pulsar Student Exploration at Parkes) - Published 21 Feb 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 21 Feb 2020
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 21 Feb 2020
We propose to measure the polarisation of distant southern pulsars (distance>5kpc) using the Ultra-Wideband Low (UWL) receiver to investigate the structure of the Galactic disk magnetic field in a... morend between distant spiral arms. Previous Parkes pulsar observations have revealed field reversals in nearby arm and interarm regions. We wish to exploit the greater sensitivity of the UWL receiver to extend this to more distant regions, thereby allowing us to distinguish more clearly between different models for the structure of the disk field. Because of the intrinsic uncertainty in DM-based pulsar distances, averaging data over groups of pulsars is necessary to confidently demonstrate any magnetic-field reversals. This work will have important implications for theories for the generation of Galactic magnetic fields and for other areas, e.g., cosmic-ray physics, which depend on a knowledge of the large-scale Galactic magnetic field for their interpretation.less
Australia Telescope National Facility - P996 - Magnetic field reversals in distant spiral arms - Published 21 Feb 2020
We propose timing observations of southern double neutron star (DNS) systems to obtain precise estimates of the component masses and thus increase the statistics of neutron star mass distribution. Th... moree improved sensitivity of the Ultra Wideband Low (UWL) receiver will provide a 3X increase in the precision of the time of arrivals (ToAs) of the pulses compared to the multibeam data. This has the potential to perform quick measurements of masses for a number of binary systems in the next 1-2 years. We will also use MeerKAT observations at crucial orbital phases to increase our chances of mass measurements. Increase in the number of measured NS masses has significant implications for understanding NS internal structure and for stellar and binary evolution physics.less
Australia Telescope National Facility - P1032 - Mass measurements of southern binary pulsar systems - Published 21 Feb 2020
This project is to continue timing and profile studies of the first double-pulsar system, a unique laboratory for gravitational physics. Recent results, including the first measurements of higher-orde... morer light-propagation effects and of the relativistic deformation of the orbit, highlight the importance of a long term observational campaign for this remarkable system. The main aims of this proposal are to provide the strongest tests to date for general relativity and to measure for the first time the moment-of-inertia of a neutron star. Additionally, we will determine the system geometry and map the pulsar beams via geodetic precession. Whenever possible, we will exploit the high sensitivity of the new UWL receiver.less
Australia Telescope National Facility - P455 - Timing & geodetic precession in the double pulsar and two relativistic binaries - Published 20 Feb 2020
Australia Telescope National Facility - PX500 - FAST: category 1 purchased time - Published 20 Feb 2020
We request time to observe 260 pulsars on a regular basis to provide the accurate ephemerides necessary for the detection and characterisation of gamma-ray pulsars with the Fermi satellite. The primar... morey science goals are to increase the number of known gamma-ray pulsars (both radio loud and radio quiet), to determine accurate pulse profiles, and to characterise their high energy (phase-resolved) spectra. In the radio, the observations will also allow us to investigate: neutron stars and pulsar emission via detecting glitches and determining pulse timing parameters; and the ISM via measuring and monitoring dispersion measures, Faraday rotation measures, and scintillation. To date, we are (co-)authors on 75 papers arising from the collaboration and P574 data. The data have contributed to the PhD theses of students from Bordeaux, Manchester, Oxford, Stanford, and Swinburne.less
Australia Telescope National Facility - P574 - Pulsar timing and the GLAST mission - Published 20 Feb 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 20 Feb 2020
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 20 Feb 2020
Recently there has been great success at Parkes discovering millisecond pulsars (MSPs), a class that includes some of the most interesting and scientifically valuable pulsars known. In the last few ye... morears, we have discovered more than 40 MSPs though the High Time Resolution Universe Survey (P630) and Fermi searches (P675/P814). Here we propose to carry out precision timing of these sources to fully exploit these discoveries. Additionally, we continue to study the most significant of the discoveries from the Parkes Multibeam Pulsar Survey (P268). To maximise scientific impact, we have combined the most important sources from various previous proposals into this project, reducing total observation time required and easing the burden on the scheduler.less
Australia Telescope National Facility - P789 - Timing of Binary & Millisecond Pulsars Discovered at Parkes - Published 19 Feb 2020
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 19 Feb 2020
These observations will form part of the ASKAP pilot survey program. This is a joint exercise between CASS and the ASKAP Survey Science Teams to conduct a series of observations to learn how to conduc... moret large-scale surveys using the full capabilities of this new telescope. The key goal of the pilot survey program is to establish readiness for full survey operations, including determining and testing observing and processing strategies, and data validation and release. The observations collected here are primarily for WALLABY.less
Australia Square Kilometre Array Pathfinder - AS102 - ASKAP Pilot Survey for WALLABY - Published 18 Feb 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 17 Feb 2020
