| Name: Raja Ram Saini |
| Affiliation: Indian Institute of Science Education and Research (IISER) Mohali |
| Conference ID: ASI2026_569 |
| Title: Delineating the distribution of dust and magnetic fields towards a star forming region NGC 2175 |
| Abstract Type: Poster |
| Abstract Category: Stars, Interstellar Medium, and Astrochemistry in Milky Way |
| Author(s) and Co-Author(s) with Affiliation: Raja Ram Saini(Indian Institute of Science Education and Research Mohali, Mohali-140306,India,), Dr. Eswaraiah Chakali(Indian Institute of Science Education and Research Mohali, Mohali-140306,India,) |
| Abstract: We present the preliminary results based on the optical polarization observations towards a star-forming region NGC 2175. We aim to investigate the interstellar dust distribution and its properties, and also variation of magnetic field orientation as a function of distance along the line of sight (LOS) of NGC 2175. Polarization (P) data are combined with Gaia-based distance (d) and extinction (Av) data to examine the variation of polarization and extinction as a function of distance (P and Av versus d), and the polarization efficiency (Av vs P/Av) of the dust along the LOS. The P vs d plot shows a gradual increasing trend up to a characteristic distance of 1.54 kpc, beyond which the polarization exhibits either a constant or a slight decreasing trend, indicating depolarisation effect by the dust grains within the star forming region. The Av vs d relation displays a gradual rise followed by a sudden jump at 1.34 kpc and a steeplying increasing trend, identifying the location of the layer of dust associated with NGC 2175. The Av vs P/Av exhibits a broken power law behaviour, with an increasing trend below the Av of 1.2 mag, and beyond which polarization efficiency declines showing a poor dust grain alignment in the regions with high extinction. Optical polarization vector map is compared with the B-field orientation inferred from 5 arcmin resolution Planck 353 GHz dust continuum polarization data. Consistency between optical and Planck field lines is observed in limited regions, while they mismatch in the majority of the region. We will also present some preliminary results based on the HINSA Zeeman data obtained from the FAST telescope toward one of the Planck Galactic Cold Clumps (PGCC).
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