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Showing results for: [ Zhang, Lei ]
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
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 - 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 - P456 - A millisecond pulsar timing array - 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
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
We propose to use the ultra-wide-bandwidth, low frequency receiver installed at the Parkes telescope in order to quantify the broad-band intermittency time scale, polarization, quasi-periodicities, an... mored mode changing of a newly discovered pulsar, PSR J1926-0653. The pulsar is unique in its emission properties. It has multiple pulse components, that change with time (both mode- changing and sub-pulse drifting phenomena are evident). The pulsar exhibits nulls in which a few individual pulses seem to be missing. It also exhibits longer-scale (hour-scale) intermittency behaviour in which the emission switches off for long periods of time. The pulse flux densities often, but not always, seem to exhibit quasi-periodic variations. Clearly this pulsar may hold the key to many different emission phenomena and we request time on Parkes, FAST and ATCA to parameterise the pulsar and its emission properties in detail.less
Australia Telescope National Facility - P985 - Characterising the Broad-band Intermittency Time Scale, Mode changing, Periodicities and Polarization Variations of PSR J1926-06 - Published 16 Oct 2019
We are resubmitting this proposal as the backend system, MEDUSA, failed after only a few hours of our observing. This means that we did not achieve wide-band observations for the majority of the pulsa... morers requested. The PULSE@Parkes sample of pulsars provides a well studied set of bright pulsars. We propose to observe these pulsars using the wide-bandwidth receiver at Parkes in order to obtain high signal-to-noise pulse profiles across the band. We will use those profiles to measure the fundamental properties of the pulse emission over the wide band by measuring flux densities, spectral indices, rotation measures and the pulse profile shape.less
Australia Telescope National Facility - P988 - Maximising the science and education output from PULSE@Parkes and OPTIMUS in the era of the wide-bandwidth receiver - Published 15 Oct 2019
Australia Telescope National Facility - P895 - Where are the gravitational waves? - Published 15 Oct 2019
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 14 Oct 2019
Australia Telescope National Facility - P595 - PULSE@Parkes (Pulsar Student Exploration at Parkes) - Published 14 Oct 2019
We propose observations with the ultra-wide-bandwidth, low-frequency receiver installed at the Parkes telescope to carry out the first ultra-high time resolution, coherently de-dispersed search for pu... morelsars in globular clusters. We have chosen the 11 most likely clusters for new discoveries. These clusters all have at least three pulsars already known allowing us to have a precise estimate of the pulsar dispersion measures and our observations will provide the first ultra-wide-bandwidth observation of these pulsars. Our observing strategy will enable us to search for extremely narrow pulsars and even pulsars with sub-millisecond periods.less
Australia Telescope National Facility - P1006 - The first ultra-high time resolution coherently de-dispersed search for new pulsars in globular clusters - Published 08 Oct 2019
A fundamental property of any astronomical source is its flux density. The new Parkes ultra-widebandwidth receiver is ideal for studying pulsar profiles and measuring flux densities over wide bands. ... moreWe have identified pulsars that can be observed by Parkes, but have no flux density measurements in the catalogue. Our proposal is simple - we wish to measure the pulsar flux densities, publish them and then later use those measurements to study pulsar populations, luminosities and to aid planning new pulsar surveys and commissioning activities.less
Australia Telescope National Facility - P1004 - Wide-band receiver observations of bright pulsars: Flux density measurements - Published 08 Oct 2019
