A First Look at BISTRO Observations of the ρ Oph-A core
Kwon, J; Doi, Y; Tamura, M; et al.Matsumura, M; Pattle, K; Berry, D; Sadavoy, S; Matthews, BC; Ward-Thompson, D; Hasegawa, T; Furuya, RS; Pon, A; Francesco, JD; Arzoumanian, D; Hayashi, SS; Kawabata, KS; Onaka, T; Choi, M; Kang, M; Hoang, T; Lee, CW; Lee, SS; Liu, HL; Liu, T; Inutsuka, SI; Eswaraiah, C; Bastien, P; Kwon, W; Lai, SP; Qiu, K; Coudé, S; Franzmann, E; Friberg, P; Graves, SF; Greaves, JS; Houde, M; Johnstone, D; Kirk, JM; Koch, PM; Li, D; Parsons, H; Rao, R; Rawlings, MG; Shinnaga, H; Loo, SV; Aso, Y; Byun, DY; Chen, HR; Chen, MCY; Chen, WP; Ching, TC; Cho, J; Chrysostomou, A; Chung, EJ; Drabek-Maunder, E; Eyres, SPS; Fiege, J; Friesen, RK; Fuller, G; Gledhill, T; Griffin, MJ; Gu, Q; Hatchell, J; Holland, W; Inoue, T; Iwasaki, K; Jeong, IG; Kang, JH; Kang, SJ; Kemper, F; Kim, G; Kim, J; Kim, KT; Kim, KH; Kim, MR; Kim, S; Lacaille, KM
Date: 20 May 2018
IOP Publishing / American Astronomical Society
We present 850 μm imaging polarimetry data of the ρ Oph-A core taken with the Submillimeter Common-User Bolometer Array-2 (SCUBA-2) and its polarimeter (POL-2) as part of our ongoing survey project, -fields In STar forming RegiOns (BISTRO). The polarization vectors are used to identify the orientation of the magnetic field projected ...
We present 850 μm imaging polarimetry data of the ρ Oph-A core taken with the Submillimeter Common-User Bolometer Array-2 (SCUBA-2) and its polarimeter (POL-2) as part of our ongoing survey project, -fields In STar forming RegiOns (BISTRO). The polarization vectors are used to identify the orientation of the magnetic field projected on the plane of the sky at a resolution of 0.01 pc. We identify 10 subregions with distinct polarization fractions and angles in the 0.2 pc ρ Oph-A core; some of them can be part of a coherent magnetic field structure in the ρ Oph region. The results are consistent with previous observations of the brightest regions of ρ Oph-A, where the degrees of polarization are at a level of a few percent, but our data reveal for the first time the magnetic field structures in the fainter regions surrounding the core where the degree of polarization is much higher (>5%). A comparison with previous near-infrared polarimetric data shows that there are several magnetic field components that are consistent at near-infrared and submillimeter wavelengths. Using the Davis-Chandrasekhar-Fermi method, we also derive magnetic field strengths in several subcore regions, which range from approximately 0.2 to 5 mG. We also find a correlation between the magnetic field orientations projected on the sky and the core centroid velocity components.
Physics and Astronomy
College of Engineering, Mathematics and Physical Sciences
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