{"dataCollectionTypeCode":"ENCAPSULATED_PULSAR","id":{"identifierType":"Fedora PID","identifier":"csiro:34979"},"dataCollectionId":34979,"dataCollectionCommonId":34979,"versionNumber":1,"dataVersionNumber":1,"self":"https://data.csiro.au/dap/ws/v2/collections/34979","landingPage":{"relationship":"alternate","mediaType":"text/html","href":"https://data.csiro.au/collection/csiro:34979","fileUpload":false,"fileId":0},"title":"Parkes observations for project P456 semester 2018APRS_13","description":"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 our 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 at three different wavelengths. With this proposal we aim to maintain our pre-eminent position in the field.\r\n\r\nUnlike 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!","legacyId":null,"fieldsOfResearch":["Astronomical sciences not elsewhere classified"],"dataStartDate":"2018-08-15","dataEndDate":"2018-08-21","keywords":"pulsars, neutron stars, P456_2018APRS","licence":"Creative Commons Attribution 4.0 International Licence","licenceLink":{"relationship":"licence","mediaType":"text/html","href":"https://data.csiro.au/dap/ws/v2/licences/1121","fileUpload":false,"fileId":0},"organisations":["CSIRO (Australia)"],"attributionStatement":"Hobbs, George; Manchester, Dick; Sarkissian, John; Bailes, Matthew; Bhat, Ramesh; Keith, Michael; Coles, William; van Straten, Willem; Russell, Chris; Oslowski, Stefan; Kerr, Matthew; Dempsey, James; Shannon, Ryan; Wang, Jingbo; Levin, Yuri; Wen, Linqing; Zhu, Xingjiang; Dai, Shi; Reardon, Daniel John;...Parthasarathy, Aditya (2018): Parkes observations for project P456 semester 2018APRS_13. v1. CSIRO. Data Collection. https://doi.org/10.25919/5b8749d33b596","rights":"All Rights (including copyright) CSIRO 2018.","access":"The metadata and files (if any) are available to the public.","published":"2018-08-30T15:51:37.182+10:00","leadResearcher":"George Hobbs","versions":"https://data.csiro.au/dap/ws/v2/collections/34979/versions","metadata":"https://data.csiro.au/dap/ws/v2/collections/34979/metadata","data":"https://data.csiro.au/dap/ws/v2/collections/34979/data","serviceCount":0,"supportingFiles":"https://data.csiro.au/dap/ws/v2/collections/34979/support","contributors":["Dick Manchester","John Sarkissian","Matthew Bailes","Ramesh Bhat","Michael Keith","William Coles","Willem van Straten","Chris Russell","Stefan Oslowski","Matthew Kerr","James Dempsey","Ryan Shannon","Jingbo Wang","Yuri Levin","Linqing Wen","Xingjiang Zhu","Shi Dai","Daniel John Reardon","Renee  Spiewak","Lei Zhang","Aditya Parthasarathy"],"allNames":[{"name":"Hobbs, George","display":"George Hobbs","orcidId":"0000-0003-1502-100X","type":"Person","orgInfo":"CSIRO Australia Telescope National Facility, Australia"},{"name":"Manchester, Dick","display":"Dick Manchester","orcidId":"0000-0001-9445-5732","type":"Person","orgInfo":"CSIRO Australia Telescope National Facility, Australia"},{"name":"Sarkissian, John","display":"John Sarkissian","orcidId":null,"type":"Person","orgInfo":"CSIRO Australia Telescope National Facility, Australia"},{"name":"Bailes, Matthew","display":"Matthew Bailes","orcidId":null,"type":"Person","orgInfo":"Swinburne University of Technology, Australia"},{"name":"Bhat, Ramesh","display":"Ramesh Bhat","orcidId":null,"type":"Person","orgInfo":"Curtin University, Australia"},{"name":"Keith, Michael","display":"Michael Keith","orcidId":null,"type":"Person","orgInfo":"Jodrell Bank Centre for Astrophysics, United Kingdom"},{"name":"Coles, William","display":"William Coles","orcidId":null,"type":"Person","orgInfo":"University of California, San Diego, United States"},{"name":"van Straten, Willem","display":"Willem van Straten","orcidId":null,"type":"Person","orgInfo":"Auckland University of Technology, New Zealand"},{"name":"Russell, Chris","display":"Chris Russell","orcidId":null,"type":"Person","orgInfo":"CSIRO Other, Australia"},{"name":"Oslowski, Stefan","display":"Stefan Oslowski","orcidId":null,"type":"Person","orgInfo":"CSIRO Space and Astronomy, Australia"},{"name":"Kerr, Matthew","display":"Matthew Kerr","orcidId":null,"type":"Person","orgInfo":"Naval Research Laboratories, United States"},{"name":"Dempsey, James","display":"James Dempsey","orcidId":"0000-0002-4899-4169","type":"Person","orgInfo":"Australia National University, Australia"},{"name":"Shannon, Ryan","display":"Ryan Shannon","orcidId":null,"type":"Person","orgInfo":"Swinburne University of Technology, Australia"},{"name":"Wang, Jingbo","display":"Jingbo Wang","orcidId":null,"type":"Person","orgInfo":"Xinjiang Astronomical Observaotry, China"},{"name":"Levin, Yuri","display":"Yuri Levin","orcidId":null,"type":"Person","orgInfo":"Monash University, Australia"},{"name":"Wen, Linqing","display":"Linqing Wen","orcidId":null,"type":"Person","orgInfo":"University of Western Australia, Australia"},{"name":"Zhu, Xingjiang","display":"Xingjiang Zhu","orcidId":null,"type":"Person","orgInfo":"Beijing Normal University, China"},{"name":"Dai, Shi","display":"Shi Dai","orcidId":"0000-0002-9618-2499","type":"Person","orgInfo":"CSIRO Space and Astronomy, Australia"},{"name":"Reardon, Daniel John","display":"Daniel John Reardon","orcidId":null,"type":"Person","orgInfo":"Swinburne University of Technology, Australia"},{"name":"Spiewak, Renee ","display":"Renee  Spiewak","orcidId":null,"type":"Person","orgInfo":"Jodrell Bank Centre for Astrophysics, United Kingdom"},{"name":"Zhang, Lei","display":"Lei Zhang","orcidId":null,"type":"Person","orgInfo":"National Astronomical Observatories, Beijing, China"},{"name":"Parthasarathy, Aditya","display":"Aditya Parthasarathy","orcidId":null,"type":"Person","orgInfo":"Swinburne University of Technology, Australia"}],"activity":{"activityId":1507,"activityTitle":"P456 - A millisecond pulsar timing array","activityType":"Observation","activityDescription":"Gravitational waves are a prediction of Einstein's general theory of relativity. Despite many searches over several decades and much current effort, there has never been a direct detection of these waves. Such a detection would open up a window into presently unobservable phenomena such as orbiting black holes in the cores of distant galaxies. Pulsars are such precise clocks that the effect of a weak gravitational wave from such sources passing over the Earth may be detectable. The Parkes Pulsar Timing Array project aims to make precise timing measurements on 20 millisecond pulsars with observations every two weeks for five years. Modelling suggests that with the improved instrumentation currently being developed and this dataspan we will have enough sensitivity to detect gravitational waves. The data will also allow us to establish a pulsar timescale which should be more precise than the best terrestrial timescales based on atomic clocks.","activityInstrument":"Parkes"},"domainType":"ATNF","collectionContentType":"Data","andsPid":"102.100.100/72943","doi":"10.25919/5b8749d33b596","project":{"irpHierarchy":false,"projectTitle":"Australia Telescope National Facility"},"nationalFacility":"Australia Telescope National Facility","nationalCollection":"Australia Telescope National Facility","organisationalLevels":{"irpHierarchy":false,"businessUnit":"Astronomy and Space Science","costCentre":"National Facility Operations","researchProgram":"Astronomy and Space Science","researchGroup":"Astronomy and Space Science"},"accessLevel":"Public","dataRestricted":"FALSE","voResource":{"ivoIdentifier":"ivo://au.csiro.atnf/P456-2018APRS_13"},"depositStatus":"P","accessViewable":false,"withdrawn":false,"blocked":false,"askapLevel7":false,"permaLink":"https://doi.org/10.25919/5b8749d33b596","selfLink":"https://data.csiro.au/collection/csiro:34979","templateCollection":false}