{"dataCollectionTypeCode":"ENCAPSULATED_PULSAR","id":{"identifierType":"Fedora PID","identifier":"csiro:70259"},"dataCollectionId":70259,"dataCollectionCommonId":70259,"versionNumber":1,"dataVersionNumber":1,"self":"https://data.csiro.au/dap/ws/v2/collections/70259","landingPage":{"relationship":"alternate","mediaType":"text/html","href":"https://data.csiro.au/collection/csiro:70259","fileUpload":false,"fileId":0},"title":"Long-term project observations for project P1321 semester 2025OCTS_10","description":"The atomic interstellar medium shows tiny-scale optical depth fluctuations on the scale of 0.1~10,000 AU, whose origin and nature are poorly understood. The existence of this Tiny-Scale Atomic Structure (TSAS) has significant implications, potentially calling into question our fundamental understanding of heating, cooling and dynamical processes in the interstellar medium. Yet observations remain sparse. This long-term project plans to search for temporal variations in HI absorption spectra seen against background pulsars to characterise TSAS in the Milky Way interstellar medium (ISM). These observations constitute the largest number of sightlines and densest temporal sampling ever performed in a single experiment, and will test predictions that TSAS is the tail end of a turbulent cascade, constrain its minimum size scale (down to resolutions of ~0.05 AU) and potentially provide the first direct measurements of pressures in \"large\" TSAS features of > 1000 AU. We make use of the phase-resolved spectral line mode that we have recently implemented on Parkes, which has cut data rates and processing times by factors of ~1000 compared to past studies. This is an expansion of our pilot P1321 to a long term study.","legacyId":null,"fieldsOfResearch":["Astronomical sciences not elsewhere classified"],"dataStartDate":"2025-10-01","dataEndDate":"2026-03-31","keywords":"pulsars, neutron stars, interstellar medium in and around the Milky Way, spectral line (Galactic)","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":"Dawson, Joanne; Johnston, Simon; Hobbs, George; Wardle, Mark; Mader, Stacy; Oslowski, Stefan; Kaczmarek, Jane; Reardon, Daniel John; Zic, Andrew; Federrath, Christoph; Weisberg, Joel; Liu, Mengting; & Kaushik, Aditi S S (2025): Long-term project observations for project P1321 semester 2025OCTS_10. v1. CSIRO. Data Collection. https://doi.org/10.25919/peag-8j14","rights":"All Rights (including copyright) CSIRO 2025.","access":"Access to this collection's metadata and/or files (if any) are restricted until 30 Sept 2027. ","published":"2025-11-26T06:39:12.157+11:00","leadResearcher":"Joanne Dawson","versions":"https://data.csiro.au/dap/ws/v2/collections/70259/versions","metadata":"https://data.csiro.au/dap/ws/v2/collections/70259/metadata","data":"https://data.csiro.au/dap/ws/v2/collections/70259/data","serviceCount":0,"supportingFiles":"https://data.csiro.au/dap/ws/v2/collections/70259/support","contributors":["Simon Johnston","George Hobbs","Mark Wardle","Stacy Mader","Stefan Oslowski","Jane Kaczmarek","Daniel John Reardon","Andrew Zic","Christoph Federrath","Joel Weisberg","Mengting Liu","Aditi S S Kaushik"],"allNames":[{"name":"Dawson, Joanne","display":"Joanne Dawson","orcidId":null,"type":"Person","orgInfo":"Macquarie University, Australia"},{"name":"Johnston, Simon","display":"Simon Johnston","orcidId":null,"type":"Person","orgInfo":"CSIRO Australia Telescope National Facility, Australia"},{"name":"Hobbs, George","display":"George Hobbs","orcidId":"0000-0003-1502-100X","type":"Person","orgInfo":"CSIRO Australia Telescope National Facility, Australia"},{"name":"Wardle, Mark","display":"Mark Wardle","orcidId":null,"type":"Person","orgInfo":"Macquarie University, Australia"},{"name":"Mader, Stacy","display":"Stacy Mader","orcidId":"0000-0002-9332-8616","type":"Person","orgInfo":"CSIRO Australia Telescope National Facility, Australia"},{"name":"Oslowski, Stefan","display":"Stefan Oslowski","orcidId":null,"type":"Person","orgInfo":"CSIRO Space and Astronomy, Australia"},{"name":"Kaczmarek, Jane","display":"Jane Kaczmarek","orcidId":"0000-0003-4810-7803","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":"Zic, Andrew","display":"Andrew Zic","orcidId":null,"type":"Person","orgInfo":"CSIRO Australia Telescope National Facility, Australia"},{"name":"Federrath, Christoph","display":"Christoph Federrath","orcidId":null,"type":"Person","orgInfo":"Australia National University, Australia"},{"name":"Weisberg, Joel","display":"Joel Weisberg","orcidId":null,"type":"Person","orgInfo":"Carleton College, United States"},{"name":"Liu, Mengting","display":"Mengting Liu","orcidId":null,"type":"Person","orgInfo":"National Astronomical Observatories, Beijing, China"},{"name":"Kaushik, Aditi S S","display":"Aditi S S Kaushik","orcidId":null,"type":"Person","orgInfo":"Macquarie University, Australia"}],"activity":{"activityId":17894,"activityTitle":"P1321 - Tiny but Important: Statistics of Tiny-Scale Atomic Structure with Murriyang","activityType":"Observation","activityDescription":"Pulsars are rapidly spinning neutron stars that blink on and off up to 100s of times per second. As the pulsar's radio waves travel through the Galaxy to reach us, they pass through immense clouds of hydrogen gas, which absorb some of the pulsar's emission. If we compare observations when the pulsar is blinking on with those where it is blinking off, we can learn about the properties of this intervening gas. We can even sometimes spot \"tiny\" clumps of gas no larger than our solar system as they move in front of the pulsar! In this project we plan to monitor several bright pulsars to see if we can spot these tiny clumps - so-called Tiny-Scale Atomic Structure. Learning about these clumps and how they form will help us understand how the interstellar gas in our Milky Way evolves, which is important for many reasons, not least because our Sun, Earth and entire solar system were born from similar clouds in the distant past.","activityInstrument":"Long-term project"},"domainType":"ATNF","collectionContentType":"Data","andsPid":"102.100.100/711529","doi":"10.25919/peag-8j14","project":{"irpHierarchy":false,"projectTitle":"Australia Telescope National Facility"},"nationalFacility":"Australia Telescope National Facility","nationalCollection":"Australia Telescope National Facility","organisationalLevels":{"irpHierarchy":true,"businessUnit":"SPACE AND ASTRONOMY","team":"NSW Observatory Operations","program":"Australia Telescope National Facility","group":"ATNF Operations"},"accessLevel":"Project Team","dataRestricted":"FALSE","voResource":{"ivoIdentifier":"ivo://au.csiro.atnf/P1321-2025OCTS"},"depositStatus":"P","accessViewable":false,"withdrawn":false,"blocked":false,"askapLevel7":false,"permaLink":"https://doi.org/10.25919/peag-8j14","selfLink":"https://data.csiro.au/collection/csiro:70259","templateCollection":false}