| Name: Prashanth Kumar Kasarla |
| Affiliation: Physical Research Laboratory |
| Conference ID: ASI2026_1107 |
| Title: Magnetic field orientation and strength in the Perseus arms from optical polarimetry and molecular line observations |
| Abstract Type: Poster |
| Abstract Category: Stars, Interstellar Medium, and Astrochemistry in Milky Way |
| Author(s) and Co-Author(s) with Affiliation: Prashanth K Kasarla(PRL), Namita Uppal(Institute of Astrophysics-FORTH), Shashikiran Ganesh(PRL), Santosh Joshi(Aryabhatta Research Institute of Observational Sciences (ARIES)) |
| Abstract: Magnetic fields play a crucial role in regulating the structure and evolution of the interstellar medium and star formation, yet their strength and geometry remain observationally challenging to constrain. We present a study of the plane-of-sky magnetic field orientation and strength in a sample of stellar clusters located along the Galactic anti-centre direction using optical starlight polarimetry combined with molecular line observations. The optical polarisation of background stars traces the magnetic field morphology through dust grain alignment, allowing us to derive the large-scale field orientation and the dispersion of polarisation angles within each cluster field.
To estimate the magnetic field strength, we incorporate molecular line data to obtain the non-thermal velocity dispersion and gas density of the associated molecular clouds. The plane-of-sky magnetic field strength is derived using the Angular Dispersion Function (ADF) method, with corrections applied to account for observational uncertainties and turbulent contributions. Here, I will present the polarisation data of some of the open clusters we observed along with their magnetic field strength and direction.
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