Magnetic Field Structure in the Star Forming Cloud L1641

다국어 초록 (Multilingual Abstract)

We present deep and wide-field near-IR imaging polarimetry toward the HH 1-2 region in the L1641 molecular cloud. We obtained data using the JHK_(s)-simultaneous imaging polarimeter SIRPOL on the Infrared Survey Facility 1.4 m telescope at the South African Astronomical Observatory. We performed aperture polarimetry for the point-like sources in order to measure their integrated polarization. We detected 79 point-like sources in the J, H, and K_(s) bands. We found that most of the near-IR polarizations seems dichroic origin, indicating that they trace the direction of projected magnetic fields in this region. The average position angle of the projected magnetic fields is found to be about 110° in all three bands. We also suggest that the magnetic field strength in L1641 is about 100 μG, based on the modified Chandrasekhar-Fermi formula.

목차 (Table of Contents)

• 1. INTRODUCTION = 1
• 2. Observations and Data Reduction = 3
• 2.1 Observations = 3
• 2.2 Data Reduction = 3
• 3. RESULTS = 5
• 4. DISCUSSION = 17
• 4.1 The Direction of Magnetic Fields = 17
• 4.2 Estimation of the Magnetic Field Strength = 21
• 4.3 Polarization of PMS Stars and Class I Sources = 22
• 4.4 Magnetic Field Direction and Outflow Axis = 22
• 5. SUMMARY = 26