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Parkes observations for project P1014 semester 2020APRS_01
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), especially the extremely small scale structures with spatial scales ranging from a few to hundreds of AU is largely unexplored. The formation and e... morevolution 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
Astronomical and Space Sciences not elsewhere classified
01 Apr 2020
30 Sep 2020
interstellar medium in and around the Milky Way
Creative Commons Attribution 4.0 International Licence
Liu, Mengting; Dickey, John; Dawson, Joanne; Hobbs, George; Stanimirovic, Snezana; Li, Di; Krco, Marko (2020): Parkes observations for project P1014 semester 2020APRS_01. v1. CSIRO. Data Collection.
All Rights (including copyright) CSIRO 2020.
Access to this collection's metadata and/or files (if any) are restricted until 30 Mar 2022.
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
Pulsars are a quickly rotating neutron star with a regular rotation period traveling through the interstellar medium with velocities of a few to hundreds of kilometers per second. Observations towards pulsars at different time epochs using the new Parkes UWL receiver with multiple spectral windows will probe tiny scale structures and detect the int... moreerstellar molecules in them. This observation will help us to understand the distribution and evolution of tiny scale structures in our galaxy leading to a better understanding of the dissipative processes in the ISM during star formation less