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SOAM, ARCHANA,GOPINATHAN, MAHESWAR,LEE, CHANG WON,BHATT, HRISH The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
We present results of our R-band polarimetry of a bright-rimmed cloud, IC1396A (with BRC 36), associated with the H II region S131 and the cometary globule LDN 1616 to study their magnetic field geometry. The distances of these clouds have been reported to be ~ 750 pc and ~ 450 pc, respectively in the literature. The young open cluster Trumpler 37 in the vicinity of IC1396A and the high mass stars in the Orion belt near L1616 are found to be responsible for the structure of these clouds. We made polarimetry of foreground stars inferred from their distances measured by the Hipparcos satellite to subtract the foreground contribution to the observed polarization results. We discuss the optical polarimetric results and compare our findings with MHD simulations towards BRCs and CGs.
Magnetic Fields toward Ophiuchus-B Derived from SCUBA-2 Polarization Measurements
Soam, Archana,Pattle, Kate,Ward-Thompson, Derek,Lee, Chang Won,Sadavoy, Sarah,Koch, Patrick M.,Kim, Gwanjeong,Kwon, Jungmi,Kwon, Woojin,Arzoumanian, Doris,Berry, David,Hoang, Thiem,Tamura, Motohide,Le American Astronomical Society 2018 The Astrophysical journal Vol.861 No.1
<P>We present the results of dust emission polarization measurements of Ophiuchus-B (Oph-B) carried out using the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) camera with its associated polarimeter (POL-2) on the James Clerk Maxwell Telescope in Hawaii. This work is part of the B-fields in Star-forming Region Observations survey initiated to understand the role of magnetic fields in star formation for nearby star-forming molecular clouds. We present a first look at the geometry and strength of magnetic fields in Oph-B. The field geometry is traced over similar to 0.2 pc, with clear detection of both of the sub-clumps of Oph-B. The field pattern appears significantly disordered in sub-clump Oph-B1. The field geometry in Oph-B2 is more ordered, with a tendency to be along the major axis of the clump, parallel to the filamentary structure within which it lies. The degree of polarization decreases systematically toward the dense core material in the two sub-clumps. The field lines in the lower density material along the periphery are smoothly joined to the large-scale magnetic fields probed by NIR polarization observations. We estimated a magnetic field strength of 630 +/- 410 mu G in the Oph-B2 sub-clump using a Davis-Chandrasekhar-Fermi analysis. With this magnetic field strength, we find a mass-to-flux ratio lambda = 1.6 +/- 1.1, which suggests that the Oph-B2 clump is slightly magnetically supercritical.</P>
TRAO Multi-beam Legacy Survey of Nearby Filamentary Molecular Clouds : Progress Report
ShinYoung Kim,Eun Jung Chung,Chang Won Lee,Philip C. Myers,Paola Caselli,Mario Tafalla,Gwanjeong Kim,Miryang Kim,Archana Soam,Maheswar Gophinathan,Tie Liu,Kyounghee Kim,Woojin Kwon,Jongsoo Kim 한국천문학회 2017 天文學會報 Vol.42 No.1
Compressed Magnetic Field in the Magnetically Regulated Global Collapsing Clump of G9.62+0.19
Liu, Tie,Kim, Kee-Tae,Liu, Sheng-Yuan,Juvela, Mika,Zhang, Qizhou,Wu, Yuefang,Li, Pak Shing,Parsons, Harriet,Soam, Archana,Goldsmith, Paul F.,Su, Yu-Nung,Tatematsu, Ken’ichi,Qin, Sheng-Li,Garay, Guido American Astronomical Society 2018 ASTROPHYSICAL JOURNAL LETTERS - Vol.869 No.1