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Showing results for: [ Hobbs, George ]
We have re-processed all the observations in the Parkes pulsar data archive obtained during the first four years of the Parkes multibeam receiver and have discovered two new fast radio bursts (FRBs) a... morend five single pulse candidates (SPCs) from unknown sources, but with Galactic dispersion measures. These signals were only detected in a single beam of the receiver suggesting that they are unlikely to be terrestrial. There are no known pulsars in the pointing direction of the five SPCs and therefore are likely giant pulses from currently unknown pulsars. Using the Ultra Wideband Low (UWL) receiver we have opportunity to detect repeating signals from the two FRBs and to confirm the five SPCs. Our previous observations have obtained new detections for one of these targets and therefore confirming that source. Therefore we propose for more observation in an attempt to confirm the remainder and to study the newly discovered source.less
Australia Telescope National Facility - P1040 - Follow-up observations of transient events detected in the Parkes data archive - Published 27 Jan 2021
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 26 Jan 2021
Intermittent pulsars are a major topic of current pulsar research as they provide a direct link between studies of pulsar emission and irregularities in the rotation of the pulsars. The new Ultra-Wide... more-Low(UWL) receiver provides unprecedented frequency coverage and will allow us to study the emission properties of the intermittent pulsars in great detail. We request observations with the UWL receiver to intermittent pulsars. These are pulsars whose emission switches on and off at long intervals from days to years. We will determine the distribution and frequency dependence of the time scales, look for weak or bursty emission in the off states and determine the bandwidth of the on/off emission process, the spectral characteristics of the emission, the evolution of pulse energy distribution over wide-band and search for possible link between long- and short-term emission variability. These observations will provide insights into how these pulsars emit and how that emission is changing in time and as a function of frequency.less
Australia Telescope National Facility - P1071 - Study of intermittent pulsars with UWL - Published 26 Jan 2021
We propose to use the Parkes UWL receiver for confirmation and monitoring a sub-set of bright FAST-discovered pulsars, especially for those discoveries located outside the sky regions covered by the p... moreurchased PX-500 project. For special FAST discoveries that already confirmed by Parkes, such as MSPs or pulsars with interesting emission properties, we propose to do long-term monitoring for them as well. These monitoring aim to solve their parameters, binary orbit, and provide significant insight into the special emission properties of these new discoveries and facilitate science. The Parkes UWL system provides a unique capability for studying the pulsars over wide bandwidths, in term of both the timing precision and frequency-dependent observing properties.less
Australia Telescope National Facility - P1092 - Confirmation and monitoring of bright FAST pulsar discoveries - Published 26 Jan 2021
Australia Telescope National Facility - P1071 - Study of intermittent pulsars with UWL - Published 25 Jan 2021
We propose to continue the timing campaign of the new millisecond pulsar, J1431-6328, discovered by the Australian SKA Pathfinder (ASKAP). PSR J1431-6328 has a spin period of 2.77 ms and is in a very ... morewide binary system with an orbital period of 88 days. The relatively low mass of the companion and the long orbital period make this binary system extremely interesting for the understanding of binary evolution. The stable profile and wide orbit of J1431-6328 also makes it a good candidate for pulsar timing arrays and tests of the strong equivalence principle. By the end of this semester, we plan to summarise the timing campaign with a paper and publish the timing solution, wide band polarisation properties of this pulsar and studies of the binary system.less
Australia Telescope National Facility - P1058 - Timing of the first ASKAP pulsar J1431-6328 - Published 24 Jan 2021
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 24 Jan 2021
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 24 Jan 2021
Australia Telescope National Facility - P1092 - Confirmation and monitoring of bright FAST pulsar discoveries - Published 23 Jan 2021
Australia Telescope National Facility - P595 - PULSE@Parkes (Pulsar Student Exploration at Parkes) - Published 22 Jan 2021
Australia Telescope National Facility - PX500 - FAST: category 1 purchased time - Published 21 Jan 2021
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 20 Jan 2021
Australia Telescope National Facility - PX500 - FAST: category 1 purchased time - Published 19 Jan 2021
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 19 Jan 2021
Australia Telescope National Facility - PX500 - FAST: category 1 purchased time - Published 18 Jan 2021
Australia Telescope National Facility - PX500 - FAST: category 1 purchased time - Published 17 Jan 2021
Australia Telescope National Facility - P1092 - Confirmation and monitoring of bright FAST pulsar discoveries - Published 15 Jan 2021
Australia Telescope National Facility - P1058 - Timing of the first ASKAP pulsar J1431-6328 - Published 15 Jan 2021
Australia Telescope National Facility - P737 - Commissioning the pulsar backends at Parkes - Published 15 Jan 2021
We propose to search for millisecond pulsars (MSPs) in an annular region around Blazar OJ 287, the most promising candidate to host a nano-Hz gravitational wave (GW) emitting supermassive black hole b... moreinary (SMBHB). We plan to use the Parkes multibeam receiver to search for MSPs in the sky region around OJ 287. The proposed survey area of 143 square degrees is expected to yield at least one and possibly three MSPs. The observing strategy ensures that detected MSPs will be most sensitive to GWs from the proposed SMBHB in OJ 287. The timing of such MPSs should allow us to probe the properties of OJ 287 in the GW window.less
Australia Telescope National Facility - P1090 - Searching for millisecond pulsars around blazar OJ 287 - Published 14 Jan 2021
Australia Telescope National Facility - P1090 - Searching for millisecond pulsars around blazar OJ 287 - Published 13 Jan 2021
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 12 Jan 2021
Australia Telescope National Facility - P595 - PULSE@Parkes (Pulsar Student Exploration at Parkes) - Published 12 Jan 2021
