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Showing results for: [ Spiewak, Renee ]
Since the year 2005, the Parkes Pulsar Timing Array (PPTA) project has been placing ever more stringent constraints on the amplitude of a gravitational wave background signal. Such upper bounds on th... moree amplitude of the gravitational wave signal are currently dominated by a single pulsar: PSR J1909-3744. The upper bound with this pulsar alone already cuts into the range of tenable theoretical models. Further reducing the amplitude bound (by continued regular observations of this pulsar) will significantly narrow that range. The first evidence of gravitational waves in the pulsar data are likely to be observed in the timing for PSR J1909-3744, but with only a single pulsar we will not be able to make an unambiguous detection. However, knowledge of the likely signal strength (derived from this pulsar) will help to optimise the observing strategy for the detection of the gravitational wave signals with existing or future pulsar timing arrays.less
Australia Telescope National Facility - P895 - Where are the gravitational waves? - Published 01 Dec 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 30 Nov 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 28 Nov 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 02 Nov 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 27 Oct 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 25 Oct 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 23 Oct 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 07 Oct 2020
Australia Telescope National Facility - P895 - Where are the gravitational waves? - Published 06 Oct 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 02 Oct 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 19 Sep 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 03 Sep 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 22 Aug 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 21 Jul 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 31 May 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 08 May 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 26 Apr 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 11 Apr 2020
Australia Telescope National Facility - P895 - Where are the gravitational waves? - Published 11 Apr 2020
Australia Telescope National Facility - P895 - Where are the gravitational waves? - Published 09 Apr 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 01 Apr 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 31 Mar 2020
Australia Telescope National Facility - P895 - Where are the gravitational waves? - Published 31 Mar 2020
