24–25 May 2021
Faculty of Science, Prince of Songkla University
Asia/Bangkok timezone

LBA full polarisation observations of the excited OH and methanol masers in G351.417+0.645

Not scheduled
15m
Faculty of Science, Prince of Songkla University

Faculty of Science, Prince of Songkla University

Oral Astronomy, Astrophysics and Cosmology

Speaker

Dr Kitiyanee Asanok (National Astronomical Research Institute of Thailand)

Description

We will present preliminary results of the full polarisation of 6.035-GHz excited OH and 6.668-GHz methanol masers towards a star-forming region G351.417+0.645. These are the first OH and methanol observations made in full polarisation using one array and five antennas of the Long Baseline Array (LBA) of Australia, which provided the highest angular resolution measurements of magnetic field directions in milliarcsecond scale in this region. The Astronomical Image Processing System (AIPS) software was used for data reduction. For polarisation calibration, we used a linear approximation model (LPCAL task in AIPS) to solve for the D-terms for all antennas using the three calibrators, 1729-373, 1343-601 and 1921-293 observed together with the target sources and then applied the solution to the target source. The polarisation position angle (PPA) previously measured from 6.668-GHz CH3OH masers with ATCA for this source was used for referencing the polarisation angle correction. The solution for D-terms of the LBA antennas at 6.035-GHz and 6.668-GHz and the linear polarisation map in this source from these two maser species at the milliarcsecond scale will be presented. Polarisation information of both excited OH and methanol masers will be compared and their implication for magnetic field structure will be discussed in this work.

Primary author

Dr Kitiyanee Asanok (National Astronomical Research Institute of Thailand)

Co-authors

Dr Thanapol Chanapote (National Astronomical Research Institute of Thailand) Dr Busaba Hutawarakorn Kramer (Max-Planck-Institut fur Radioastronomie) Dr Richard Dodson (International Centre for Radio Astronomy Research) Dr Maria Rioja (International Centre for Radio Astronomy Research) Dr James Green (CSIRO Astronomy and Space Science) Dr Koichiro Sugiyama (1National Astronomical Research Institute of Thailand)

Presentation materials