| Name: | Archana Soam |
| Affiliation: | IIA, Bangalore |
| Conference ID : | ASI2024_277 |
| Title : | Radiative driven grain alignment and depolarisation in starless core L183 |
| Authors : | Archana Soam1, B-G Andersson2, Le Ngoc Tram3 |
| Authors Affiliation: | 1. Indian Institute of Astrophysics (IIA), Bengaluru, India
2. SOFIA Science Center, NASA Ames Research Center, CA, USA
3. Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53-121, Bonn, Germany |
| Mode of Presentation: | Poster |
| Abstract Category : | Stars, Interstellar Medium, and Astrochemistry in Milky Way |
| Abstract : | The two most popular theories for grain alignment are paramagnetic relaxation and Radiative Alignment Torque (RAT). Observational evidence of clouds support RAT theory for grain alignment. I will present my results on our investigation of the polarization properties and variation of fractional polarization in starless core L183 using polarization observations in optical, NIR, and submm wavelengths. We aim to investigate how polarization properties change with extinction (Av) measured at cloud and core scales in L183. The optical and NIR observations trace the polarization in cloud up to an extinction of 15 mag. The core polarization is traced by high resolution submm polarization observations up to 50 mag. We see a drop in fractional polarization with extinction at all wavelengths. Interestingly, we see a sudden drop (“kink”) in the fractional polarization at ~9 and ~21 magnitudes of extinction. Analytical calculations on maximum and minimum size of alignable dust grains at these extinctions are also included. |
