Kwon, J;
Doi, Y;
Tamura, M;
Matsumura, M;
Pattle, K;
Berry, D;
Sadavoy, S;
... Zenko, T; + view all
(2018)
A First Look at BISTRO Observations of the rho Oph-A core.
Astrophysical Journal
, 859
(1)
, Article 4. 10.3847/1538-4357/aabd82.
Preview |
Text
Kwon_2018_ApJ_859_4.pdf - Published Version Download (6MB) | Preview |
Abstract
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, ${\boldsymbol{B}}$-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 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.
| Type: | Article |
|---|---|
| Title: | A First Look at BISTRO Observations of the rho Oph-A core |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3847/1538-4357/aabd82 |
| Publisher version: | https://doi.org/10.3847/1538-4357/aabd82 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, circumstellar matter, ISM: individual objects (Ophiuchi), ISM: structure, polarization, radio continuum: ISM, stars: formation, MAGNETIC-FIELD STRUCTURE, STAR-FORMING REGIONS, CLERK MAXWELL TELESCOPE, INFRARED IMAGING POLARIMETRY, OPHIUCHUS MOLECULAR CLOUD, GOULD BELT SURVEY, DARK CLOUD, SUBMILLIMETER POLARIZATION, INITIAL CONDITIONS, VLA 1623 |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10050668 |
Archive Staff Only
 |
View Item |
