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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 29 Mar 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 VAST.less
Australia Square Kilometre Array Pathfinder - AS107 - ASKAP Pilot Survey for VAST - Published 28 Mar 2020
We propose to observe the magnetars 1E 1547.0-5408 and PSR J1622-4950 approximately weekly, to track their rotation, flux density, and polarisation, as we have been doing through this project. Also,... more as of late 2018, XTE J1810-197 is again a radio magnetar after 10 years dormant! Its chaotic rotation is better tracked in detail elsewhere, but weekly observations with the UWL receiver are already providing unique measurements of its radio spectrum and broad-band behaviour. Our observations provide an important window into remarkably dynamic magnetar magnetospheres, and characterise the conditions under which radio emission takes place therein, placing constraints on the emission mechanisms, which in at least some significant respects differ from those of ordinary pulsars.less
Australia Telescope National Facility - P885 - Understanding the Remarkable Behaviour of Radio Magnetars - Published 28 Mar 2020
Parkes pulsar observations with undefined project IDs for 2020
Australia Telescope National Facility - PUNDEF - Pulsar projects (undefined in OPAL) - Published 28 Mar 2020
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 28 Mar 2020
A search for giant pulses
Australia Telescope National Facility - P365 - A search for giant pulses - Published 27 Mar 2020
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 27 Mar 2020
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 26 Mar 2020
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 25 Mar 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 24 Mar 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 24 Mar 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 24 Mar 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 24 Mar 2020
We recently discovered two millisecond pulsars (MSPs) in the globular cluster, Omega Centauri, the first pulsar discovery in this globular cluster. The discovery of these MSPs will enable us to study ... morethe stellar population and dynamics in the core of Omega Centauri, and to probe the ionised interstellar medium in Omega Centauri. These two MSPs are potentially in extreme eclipsing systems, and are useful for us to understand the formation of such systems. More importantly, our discoveries, for the first time, allow us to carry out a deep, coherently de-dispersed, high time resolution survey of pulsars in Omega Centauri, which might lead to exciting discoveries. We propose to carry out follow-up timing observations of the new discoveries, and a new coherently de-dispersed, high time resolution survey of Omega Centauri.less
Australia Telescope National Facility - P1034 - Follow-up of the first millisecond pulsar discoveries in Omega Centauri and a new coherently de-dispersed survey - Published 24 Mar 2020
Australia Telescope National Facility - P595 - PULSE@Parkes (Pulsar Student Exploration at Parkes) - Published 23 Mar 2020
Australia Telescope National Facility - P1032 - Mass measurements of southern binary pulsar systems - Published 23 Mar 2020
