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Showing results for: [ Bhat, Ramesh ]
This is a request for observing time for the initial follow-up of pulsar discoveries from the re-processing of the low-latitude Galactic plane section of the HTRU survey (P630). We have now completed ... morea first pass re-processing of the 60 % of the survey with GPU based coherent acceleration search and template bank search pipelines, and have discovered potential 54 previously unknown pulsars. Interesting science can usually only be derived from a new pulsar after confirmation and a follow-up timing campaign is carried out. One year of initial timing is the minimum timespan required to fully characterise any newly-discovered pulsars, essential for deriving pulsar parameters such as the characteristic age, magnetic field strength, spin-down rate, as well as to detect any unexpected behaviour of the pulsar which might result from emission instabilities. This follow-up and timing project is necessary for following up on any interesting pulsar systems discovered from the HTRU Galactic plane survey. Since all of the pulsars on the observing list here are being followed-up for the first time, they will produce completely new and exciting results. In addition, this timing project will enable a large-scale examination of the Galactic plane pulsar population, exploring the true boundaries of pulsar parameter space.less
Australia Telescope National Facility - P1050 - Initial Follow-up of Potential Pulsar Discoveries from Re-processing of the HTRU-S LowLat Galactic Plane Survey - Published 27 Jul 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 21 Jul 2020
Australia Telescope National Facility - P1050 - Initial Follow-up of Potential Pulsar Discoveries from Re-processing of the HTRU-S LowLat Galactic Plane Survey - Published 17 Jul 2020
Australia Telescope National Facility - P1050 - Initial Follow-up of Potential Pulsar Discoveries from Re-processing of the HTRU-S LowLat Galactic Plane Survey - Published 07 Jul 2020
Australia Telescope National Facility - P1050 - Initial Follow-up of Potential Pulsar Discoveries from Re-processing of the HTRU-S LowLat Galactic Plane Survey - Published 30 Jun 2020
Australia Telescope National Facility - P1050 - Initial Follow-up of Potential Pulsar Discoveries from Re-processing of the HTRU-S LowLat Galactic Plane Survey - Published 29 Jun 2020
Australia Telescope National Facility - P1050 - Initial Follow-up of Potential Pulsar Discoveries from Re-processing of the HTRU-S LowLat Galactic Plane Survey - Published 23 Jun 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 03 Jun 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 31 May 2020
Australia Telescope National Facility - P1050 - Initial Follow-up of Potential Pulsar Discoveries from Re-processing of the HTRU-S LowLat Galactic Plane Survey - Published 24 May 2020
Australia Telescope National Facility - P1050 - Initial Follow-up of Potential Pulsar Discoveries from Re-processing of the HTRU-S LowLat Galactic Plane Survey - Published 21 May 2020
Australia Telescope National Facility - P1050 - Initial Follow-up of Potential Pulsar Discoveries from Re-processing of the HTRU-S LowLat Galactic Plane Survey - Published 20 May 2020
Australia Telescope National Facility - P1050 - Initial Follow-up of Potential Pulsar Discoveries from Re-processing of the HTRU-S LowLat Galactic Plane Survey - Published 19 May 2020
Australia Telescope National Facility - P1050 - Initial Follow-up of Potential Pulsar Discoveries from Re-processing of the HTRU-S LowLat Galactic Plane Survey - Published 17 May 2020
Australia Telescope National Facility - P1050 - Initial Follow-up of Potential Pulsar Discoveries from Re-processing of the HTRU-S LowLat Galactic Plane Survey - Published 14 May 2020
Australia Telescope National Facility - P971 - Orbital dynamics and the intra-binary medium of PSR J1141-6545 - Published 12 May 2020
After five decades of study, the physics of radio wave emission and propagation in the pulsar magnetosphere remains poorly understood. This is largely due to the wide variety of dynamic phenomena obs... moreerved in pulsar signals that are neither predicted nor explained by current theory, the limited window of the pulsar spectrum that previously could be studied simultaneously, and the biased sample of the pulsar population that has been studied to date. To address these limitations, we have developed pioneering statistical methods that provide new interpretive insights and enable us to study the dynamics of the radio pulsar signal on short time scales (e.g. drifting and quasi-periodic sub-pulse structure, transitions between orthogonally polarized modes of emission, nulling, etc.) even when individual pulses cannot be detected. Using our novel methods and the ultra-wide bandwidth receiver at Parkes, we will undertake a large-scale survey of pulsar radio emission statistics and explore two previously inaccessible regions where pulsar flux densities are typically much lower: the pulsar spectrum above 2 GHz, and the recycled pulsar population. Measuring the instantaneous bandwidth of impulsive emission events will yield new constraints on the physical conditions in the pulsar magnetosphere, such as the spatial scale of strong turbulence in the magnetospheric plasma. The breadth of our sample, from millisecond pulsars to magnetars, will enable us to study the evolution of emission and propagation physics over four orders of magnitude in magnetospheric size and seven orders of magnitude in magnetic field strength.less
Australia Telescope National Facility - P1052 - Pulsar Radio Emission Statistics Survey (PRESS) - Published 11 May 2020
Australia Telescope National Facility - P1050 - Initial Follow-up of Potential Pulsar Discoveries from Re-processing of the HTRU-S LowLat Galactic Plane Survey - Published 10 May 2020
Australia Telescope National Facility - P1050 - Initial Follow-up of Potential Pulsar Discoveries from Re-processing of the HTRU-S LowLat Galactic Plane Survey - Published 08 May 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 08 May 2020
Australia Telescope National Facility - P1050 - Initial Follow-up of Potential Pulsar Discoveries from Re-processing of the HTRU-S LowLat Galactic Plane Survey - Published 06 May 2020
Australia Telescope National Facility - P1050 - Initial Follow-up of Potential Pulsar Discoveries from Re-processing of the HTRU-S LowLat Galactic Plane Survey - Published 05 May 2020
Australia Telescope National Facility - P1050 - Initial Follow-up of Potential Pulsar Discoveries from Re-processing of the HTRU-S LowLat Galactic Plane Survey - Published 03 May 2020
