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Showing results for: [ Oslowski, Stefan ]
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 15 Jan 2020
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 13 Jan 2020
Australia Telescope National Facility - P971 - Orbital dynamics and the intra-binary medium of PSR J1141-6545 - Published 08 Jan 2020
Magnetic field measurements of the Solar wind (SW) are extremely challenging, especially at close angular distances from the Sun. If they are obtained by measuring Faraday rotation of the radiation of... more background sources like active galactic nuclei, they are typically dependent on models of the electron density distribution in the heliosphere. However, pulsars can provide simultaneous, model-independent measurements of the electron density along the line-of-sight, along with Faraday Rotation estimates, and thus direct measurements of the SW magnetic field. Moreover, high-precision pulsar timing experiments such as Pulsar Timing Arrays (PTAs) can be strongly affected by the free electron distribution in the SW, and it is fundamentally important to understand, model and mitigate its influence on PTAs signals. With this proposal we aim to obtain high-cadence and precise measurements of the magnetic field and the electron density distribution of the SW by tracking three pulsars with low- to mid-ecliptic latitudes during their Solar approaches, and to reconstruct the SW dependence on the heliographic latitude. This will allow us to characterise the magnetic field of the SW and to collect precious information about the short-term fluctuations in the electron density that can appear as correlated noise in PTAs.less
Australia Telescope National Facility - P1008 - Tracking the Solar wind with pulsars - Published 07 Jan 2020
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 05 Jan 2020
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 04 Jan 2020
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 03 Jan 2020
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 02 Jan 2020
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 01 Jan 2020
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 31 Dec 2019
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 29 Dec 2019
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 29 Dec 2019
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 24 Dec 2019
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 24 Dec 2019
Australia Telescope National Facility - P737 - Commissioning the pulsar backends at Parkes - Published 22 Dec 2019
Australia Telescope National Facility - P971 - Orbital dynamics and the intra-binary medium of PSR J1141-6545 - Published 14 Dec 2019
Australia Telescope National Facility - P971 - Orbital dynamics and the intra-binary medium of PSR J1141-6545 - Published 12 Dec 2019
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 12 Dec 2019
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 11 Dec 2019
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 10 Dec 2019
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 03 Dec 2019
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 29 Nov 2019
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 26 Nov 2019
Australia Telescope National Facility - P958 - Searching for repetition from ASKAP fast radio bursts - Published 20 Nov 2019
