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Showing results for: [ Hobbs, George ]
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 03 Dec 2019
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 PX500) 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 (PX500) 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 (relating to this proposal) will be scheduled in shorter blocks and the data archived with a 10 year embargo.less
Australia Telescope National Facility - PX501 - FAST: category 2 purchased time - Published 18 Nov 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 17 Nov 2019
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 15 Nov 2019
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 15 Nov 2019
Australia Telescope National Facility - PX501 - FAST: category 2 purchased time - Published 15 Nov 2019
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 14 Nov 2019
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 13 Nov 2019
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 12 Nov 2019
Australia Telescope National Facility - P1027 - Follow-up of the ASKAP discovery of millisecond pulsar J1431-6328 - Published 08 Nov 2019
Australia Telescope National Facility - P574 - Pulsar timing and the GLAST mission - Published 08 Nov 2019
Australia Telescope National Facility - PX501 - FAST: category 2 purchased time - Published 08 Nov 2019
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 07 Nov 2019
Australia Telescope National Facility - PX500 - FAST: category 1 purchased time - Published 04 Nov 2019
Australia Telescope National Facility - P574 - Pulsar timing and the GLAST mission - Published 02 Nov 2019
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 31 Oct 2019
This collection contains data from the Parkes Pulsar Timing Array (PPTA) project. This project makes use of observations of radio pulsars from the CSIRO Parkes radio telescope. The project has three m... moreain goals: 1) detecting gravitational waves, 2) developing a pulsar-based time standard and 3) searching for unknown objects in our solar system. The data provided here is the second data release from the PPTA project. It contains pulse arrival times and timing models for 26 millisecond pulsars.less
ATNF Science – Astronomy Research - - Published 31 Oct 2019
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 29 Oct 2019
Australia Telescope National Facility - PX500 - FAST: category 1 purchased time - Published 24 Oct 2019
We propose a targeted search for pulsars in Terzan 6 - this is a rich globular cluster with a high two-body encounter rate. It was recently identified as a prime candidate for deep searches in a popu... morelation analysis by Turk & Lorimer. Based on our calculations, we expect to reach a sensitivity of below 10 uJy in a full transit of the cluster which will be sufficient to discover several new pulsars. Like Terzan 5, this cluster is expected to contain a variety of interesting millisecond and binary pulsars.less
Australia Telescope National Facility - P998 - Terzan 6 - The Next Terzan 5? - Published 18 Oct 2019
We propose observations with the ultra-wide-bandwidth, low frequency receiver installed at the Parkes telescope to carry out the first coherently de-dispersed search for new pulsars in Southern globul... morear clusters. We have chosen the three most likely clusters for new discoveries. We propose to observe each cluster from rise-to-set and will process the resulting data to study the known pulsars (allowing us, for the first time, to study the wide-band properties of their signal), whilst also looking for currently unknown pulsars. We note that the first black-hole--pulsar binary system is likely to be found in a globular cluster environment.less
Australia Telescope National Facility - P982 - The first coherently de-dispersed search for new pulsars in Southern globular clusters - Published 17 Oct 2019
We propose to measure the polarisation of 107 southern pulsars (distance>5kpc. 77 in this semester) using the Ultra-Wideband Low (UWL) receiver to investigate the structure of the Galactic disk m... moreagnetic field in and 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 receive r 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 17 Oct 2019
Australia Telescope National Facility - PX501 - FAST: category 2 purchased time - Published 17 Oct 2019
Australia Telescope National Facility - PX500 - FAST: category 1 purchased time - Published 16 Oct 2019
