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Showing results for: [ Hobbs, George ]
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 23 Feb 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 22 Feb 2020
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 22 Feb 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 22 Feb 2020
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 21 Feb 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 21 Feb 2020
Australia Telescope National Facility - P595 - PULSE@Parkes (Pulsar Student Exploration at Parkes) - Published 21 Feb 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 21 Feb 2020
We propose to measure the polarisation of distant southern pulsars (distance>5kpc) using the Ultra-Wideband Low (UWL) receiver to investigate the structure of the Galactic disk magnetic field in a... morend 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 receiver 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 21 Feb 2020
Australia Telescope National Facility - PX500 - FAST: category 1 purchased time - Published 20 Feb 2020
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 20 Feb 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 20 Feb 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 17 Feb 2020
Australia Telescope National Facility - P1027 - Follow-up of the ASKAP discovery of millisecond pulsar J1431-6328 - Published 16 Feb 2020
We propose observations with the ultra-wide-bandwidth, low frequency receiver (UWL) installed at the Parkes telescope to carry out the first well-calibrated coherent de-dispersed search for pulsars in... more 47 Tucanae. The proposed observation could result in new pulsars and also provide the firstly detailed study of the calibration and polarisation properties for previously known pulsars.less
Australia Telescope National Facility - P1022 - The first well-calibrated, coherent de-dispersed search for pulsars in 47 Tucanae - Published 16 Feb 2020
Australia Telescope National Facility - P1027 - Follow-up of the ASKAP discovery of millisecond pulsar J1431-6328 - Published 15 Feb 2020
The spatial distribution of neutral gas is important for understanding the interstellar medium (ISM) evolution and star formation. However, the distribution of Tiny Scale Atomic Structures (TSAS), esp... moreecially the extremely small scale structures with spatial scales ranging from a few to hundreds of AU are largely unexplored. The formation and evolution of TSAS are still on an active debate. Multi-epoch observations of HI absorption against pulsars are a tested, practical observational method to probe the TSAS, due to pulsar’s nature on-off state and proper motions of 1 to 100 AU per year. We thus propose two epoch observations, which are separated by about five months, for three bright pulsars for probing structures ranging from 8 to 1900 AU.less
Australia Telescope National Facility - P1014 - A Search For Small Scale Structures in the ISM (Few to Hundreds of AU Scales) Using the new Parkes UWL Receiver - Published 15 Feb 2020
Australia Telescope National Facility - P1022 - The first well-calibrated, coherent de-dispersed search for pulsars in 47 Tucanae - Published 15 Feb 2020
Australia Telescope National Facility - P1022 - The first well-calibrated, coherent de-dispersed search for pulsars in 47 Tucanae - Published 14 Feb 2020
Australia Telescope National Facility - P1022 - The first well-calibrated, coherent de-dispersed search for pulsars in 47 Tucanae - Published 12 Feb 2020
Australia Telescope National Facility - P595 - PULSE@Parkes (Pulsar Student Exploration at Parkes) - Published 03 Feb 2020
Australia Telescope National Facility - P996 - Magnetic field reversals in distant spiral arms - Published 01 Feb 2020
Australia Telescope National Facility - P1022 - The first well-calibrated, coherent de-dispersed search for pulsars in 47 Tucanae - Published 01 Feb 2020
This database records all the single pulse candidates with snr above 7 during re-processing all of the observations obtained during the first four years (from 1997 to 2001) of the Parkes multibeam rec... moreeiver. It contains 568,736,756 pulse candidates, include five FRBs (one is new); five single pulse candidates from unknown sources, but with Galactic dispersion measure, and 385 unique pulsars with single pulses of S/N >=8. We also provide few tools to manage the database : https://bitbucket.csiro.au/scm/spdb/spc-usertools.gitless
ATNF Science – Astronomy Research - - Published 31 Jan 2020
