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Parkes observations for project P1219 semester 2023OCTS_05

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Title Parkes observations for project P1219 semester 2023OCTS_05
 
Creator Mengting Liu
 
Subject Astronomical sciences not elsewhere classified
 
Description The magnetic field potentially regulates the process of star formation and the evolution of molecular clouds. It is inherently difficult to measure interstellar magnetic field strengths, with the measurement of Zeeman splitting a unique method to estimate the magnetic field strength along the line of sight directly. Despite the detection of Zeeman splitting in other mediums, there are as yet no Zeeman detections against compact background sources in quiescent molecular clouds or the cold neutral medium. Pulsars with extremely small solid angles and relatively high transverse velocities are ideal background sources to study the magnetic field in molecular clouds, providing a distinct signal to measure splitting against. There are four pulsars with OH absorption detections, namely PSR B1849+00, B1641-45, B1718-35, and B1749-28. We propose to utilize these four pulsars to explore the properties of the magnetic field and its variations within molecular clouds through both the Zeeman splitting of OH absorption and rotation measure estimations, between epochs. If a detection is confirmed, it will open a new window on the hard-to-measure magnetic fields in molecular clouds, independent of interpretation, thus shedding light on the physics of star formation and the interstellar medium.
 
Publisher CSIRO
 
Contributor Naomi Mcclure-Griffiths
James Green
Joanne Dawson
George Hobbs
Carl Heiles
Di Li
Tao-Chung Ching
Li Zhi-Yun
Donghui Quan
 
Date 2023-12-01
 
Type —
 
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Identifier csiro:61150
 
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