A First Look at BISTRO Observations of the ρ Oph-A core

Medientyp: E-Artikel
Titel: A First Look at BISTRO Observations of the ρ Oph-A core
Beteiligte: Kwon, Jungmi; Doi, Yasuo; Tamura, Motohide; Matsumura, Masafumi; Pattle, Kate; Berry, David; Sadavoy, Sarah; Matthews, Brenda C.; Ward-Thompson, Derek; Hasegawa, Tetsuo; Furuya, Ray S.; Pon, Andy; Francesco, James Di; Arzoumanian, Doris; Hayashi, Saeko S.; Kawabata, Koji S.; Onaka, Takashi; Choi, Minho; Kang, Miju; Hoang, Thiem; Lee, Chang Won; Lee, Sang-Sung; Liu, Hong-Li; Liu, Tie; [...]
Erschienen: American Astronomical Society, 2018
Erschienen in: The Astrophysical Journal
Sprache: Nicht zu entscheiden
DOI: 10.3847/1538-4357/aabd82
ISSN: 0004-637X; 1538-4357
Schlagwörter: Space and Planetary Science ; Astronomy and Astrophysics
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Beschreibung: <jats:title>Abstract</jats:title> <jats:p>We present 850 <jats:italic>μ</jats:italic>m imaging polarimetry data of the <jats:italic>ρ</jats:italic> 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, <jats:inline-formula> <jats:tex-math> <?CDATA ${\boldsymbol{B}}$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjaabd82ieqn1.gif" xlink:type="simple" /> </jats:inline-formula>-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 <jats:italic>ρ</jats:italic> Oph-A core; some of them can be part of a coherent magnetic field structure in the <jats:italic>ρ</jats:italic> Oph region. The results are consistent with previous observations of the brightest regions of <jats:italic>ρ</jats:italic> 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.</jats:p>
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