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Showing results for: [ Hobbs, George ]
The spatial distribution of neutral gas is important for understanding the interstellar medium (ISM), its evolution, and star formation. However, the distribution of Tiny Scale Atomic Structures (TSAS... more), especially the extremely small scale structures with spatial scales ranging from a few to hundreds of AU is largely unexplored. The formation and evolution of TSAS are still unknown. Multi-epoch observations of HI absorption against pulsars are a tested, practical observational method to probe the TSAS. Based on our observations in the 2019 APRS semester, we successfully processed baseband data and detected the HI absorption variation at over 4-months towards B1557-50. PSR B1451-68 is another ideal source to trace the TSAS because of the intervening cold gas. We thus propose one-epoch observation towards B1557-50 which should be as early in the semester as possible, and two-epoch observations towards B1451-68 to be separated by about 5 months, for monitoring the HI absorption variations and probing structures on a range of scales. This will better constrain the characteristics of variations in HI absorption, thus contribute significantly to understanding the origin of TSAS.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 25 Oct 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 25 Oct 2020
We propose observations with the ultra-wide-bandwidth, low frequency receiver (UWL) installed at the Parkes telescope to carry out single pulse study of millisecond pulsars. We have selected two of th... moree brightest pulsars that are regularly observed by the Parkes Pulsar Timing Array. Our observations will enable statistical properties study of single pulses with ultra-wide-bandwidth, measuring jitter noise level of the linear and circular polarization states as well as in the total intensity signal, measuring jitter bandwidth and how jitter noise decorrelates with frequency. The UWL receiver, with its much wider bandwidth, will provide unique opportunity for study of jitter noise evolution with frequency.less
Australia Telescope National Facility - P1043 - Single pulse study of millisecond pulsars using the Parkes wideband receiver - Published 25 Oct 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 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 25 Oct 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 25 Oct 2020
We propose to carry out a Parkes timing campaign of the new millisecond pulsar, J1431-6328, discovered by the Australian SKA Pathfinder (ASKAP) and Parkes Ultra-Wideband Low (UWL) receiver. PSR J1431-... more6328 has a spin period of 2.77 ms and is in a very wide 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 wide orbit of J1431-6328 also makes it useful for tests of the strong equivalence principle. The proposed program will allow us to better measure its binary parameters and to achieve more precise localisation of the pulsar, which is crucial for the optical follow-up of the system.less
Australia Telescope National Facility - P1058 - Timing of the first ASKAP pulsar J1431-6328 - Published 25 Oct 2020
We propose to monitor the potential repeating FRBs in the Southern Sky with luminosity di- chotomy criterion. With a success of luminosity-guided detection of a repeating source by FAST, we can contin... moreue to search for more repeaters hidden in current FRB sample according to luminosity dichotomy. Specifically, we select FRB 171020 and FRB 180923 as the targets of proposed obser- vations, which are located in the repeater population in the luminosity function. We demonstrate that the observing with 20 hours for each source is optimistic using Parkes ultra-wide-bandwidth receiver (UWL), if there are repeaters among them.less
Australia Telescope National Facility - P1062 - Monitoring the repeating FRB candidates in the Southern Sky - Published 24 Oct 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 24 Oct 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 23 Oct 2020
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 23 Oct 2020
Australia Telescope National Facility - PX500 - FAST: category 1 purchased time - Published 22 Oct 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 21 Oct 2020
Australia Telescope National Facility - P737 - Commissioning the pulsar backends at Parkes - Published 20 Oct 2020
Australia Telescope National Facility - P1058 - Timing of the first ASKAP pulsar J1431-6328 - Published 20 Oct 2020
Australia Telescope National Facility - P595 - PULSE@Parkes (Pulsar Student Exploration at Parkes) - Published 20 Oct 2020
We propose to use the Parkes UWL receiver for monitoring a small sub-set of the FAST-discovered pulsars, with special properties. The Parkes UWL system provides a unique capability for studying the pu... morelsars over wide bandwidths. The observation proposed will provide significant insight into the special emission properties of these new discoveries and facilitate science.less
Australia Telescope National Facility - P1063 - Long term monitoring of FAST discoveries - Published 19 Oct 2020
Australia Telescope National Facility - PX500 - FAST: category 1 purchased time - Published 19 Oct 2020
The propagation of pulsar signal through the interstellar medium is affected by the fluctuations in the electron density in the line of sight from the pulsar to the observer. This is a frequency depen... moredent phenomenon and will produce brightness variations (scintillation) and also broadening of the otherwise narrow pulse (scatter-broadening). The effect of these two are measurable at different frequencies due to their strong dependence on frequency, viz., broadening will be evident at lower radio frequencies and scintillation will be clearly resolved at higher frequencies. With this proposal, we aim to study the evolution of scatter-broadening and scintillation properties of 137 pulsars with the UWL receiver, and verify their relationship with each other. With this experiment, we aim at testing some of the fundamental theories of ionised interstellar medium. This large sample will also help in improving the understanding of the turbulence characteristics in the inner Galaxy. We request a total of 149 hours for this project.less
Australia Telescope National Facility - P1064 - Probing the Ionised Interstellar Medium with Pulsars - Published 19 Oct 2020
Australia Telescope National Facility - PX501 - FAST: category 2 purchased time - Published 19 Oct 2020
Australia Telescope National Facility - P1063 - Long term monitoring of FAST discoveries - Published 18 Oct 2020
Australia Telescope National Facility - P1064 - Probing the Ionised Interstellar Medium with Pulsars - Published 18 Oct 2020
Australia Telescope National Facility - P595 - PULSE@Parkes (Pulsar Student Exploration at Parkes) - Published 18 Oct 2020
Australia Telescope National Facility - P737 - Commissioning the pulsar backends at Parkes - Published 18 Oct 2020
Australia Telescope National Facility - PX500 - FAST: category 1 purchased time - Published 18 Oct 2020
