A First Look at BISTRO Observations of the rho Oph-A core
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AbstractWe present 850 mu m imaging polarimetry data of the rho 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, B-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 rho Oph-A core; some of them can be part of a coherent magnetic field structure in the rho Oph region. The results are consistent with previous observations of the brightest regions of rho 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.
All Author(s) ListKwon J, Doi Y, Tamura M, Matsumura M, Pattle K, Berry D, Sadavoy S, Matthews BC, Ward-Thompson D, Hasegawa T, Furuya RS, Pon A, Di Francesco J, Arzoumanian D, Hayashi SS, Kawabata KS, Onaka T, Choi M, Kang M, Hoang T, Lee CW, Lee SS, Liu HL, Liu T, Inutsuka S, Eswaraiah C, Bastien P, Kwon W, Lai SP, Qiu KP, Coude S, Franzmann E, Friberg P, Graves SF, Greaves JS, Houde M, Johnstone D, Kirk JM, Koch PM, Di Li D, Parsons H, Rao R, Rawlings MG, Shinnaga H, van Loo S, 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, Lee JE, Li DL, Li HB, Liu JH, Liu SY, Lyo AR, Mairs S, Moriarty-Schieven GH, Nakamura F, Nakanishi H, Ohashi N, Peretto N, Pyo TS, Qian L, Retter B, Richer J, Rigby A, Robitaille JF, Savini G, Scaife AMM, Soam A, Tang YW, Tomisaka K, Wang HC, Wang JW, Whitworth AP, Yen HW, Yoo H, Yuan JH, Zhang CP, Zhang GY, Zhou JJ, Zhu L, Andre P, Dowell CD, Falle S, Tsukamoto Y, Nakagawa T, Kanamori Y, Kataoka A, Kobayashi MIN, Nagata T, Saito H, Seta M, Zenko T
Journal nameAstrophysical Journal
Volume Number859
Issue Number1
Article number4
LanguagesEnglish-United Kingdom
Keywordscircumstellar matter,ISM: individual objects (Ophiuchi),ISM: structure,polarization,radio continuum: ISM,stars: formation
Web of Science Subject CategoriesAstronomy & Astrophysics;Astronomy & Astrophysics

Last updated on 2020-04-04 at 12:10