First Results from BISTRO: A SCUBA-2 Polarimeter Survey of the Gould Belt
Di Francesco, J
van Loo, S
American Astronomical Society / IOP Publishing
© 2017. The American Astronomical Society. All rights reserved.
We present the first results from the B-fields In STar-forming Region Observations (BISTRO) survey, using the Sub-millimetre Common-User Bolometer Array 2 camera, with its associated polarimeter (POL-2), on the James Clerk Maxwell Telescope in Hawaii. We discuss the survey’s aims and objectives. We describe the rationale behind the survey, and the questions that the survey will aim to answer. The most important of these is the role of magnetic fields in the star formation process on the scale of individual filaments and cores in dense regions. We describe the data acquisition and reduction processes for POL-2, demonstrating both repeatability and consistency with previous data. We present a first-look analysis of the first results from the BISTRO survey in the OMC 1 region. We see that the magnetic field lies approximately perpendicular to the famous “integral filament” in the densest regions of that filament. Furthermore, we see an “hourglass” magnetic field morphology extending beyond the densest region of the integral filament into the less-dense surrounding material, and discuss possible causes for this. We also discuss the more complex morphology seen along the Orion Bar region. We examine the morphology of the field along the lower-density northeastern filament. We find consistency with previous theoretical models that predict magnetic fields lying parallel to low-density, non-self-gravitating filaments, and perpendicular to higher-density, self-gravitating filaments.
The James Clerk Maxwell Telescope is operated by the East Asian Observatory on behalf of The National Astronomical Observatory of Japan, Academia Sinica Institute of Astronomy and Astrophysics, the Korea Astronomy and Space Science Institute, the National Astronomical Observatories of China and the Chinese Academy of Sciences (grant No. XDB09000000), with additional funding support from the Science and Technology Facilities Council of the United Kingdom and participating universities in the United Kingdom and Canada. Additional funds for the construction of SCUBA-2 and POL-2 were provided by the Canada Foundation for Innovation. The data taken in this paper were observed under project codes M15BEC02 and M16AL004. D.W.T. and K.P. acknowledge Science and Technology Facilities Council (STFC) support under grant numbers ST/K002023/1 and ST/M000877/1. W.K., M.K., C.W.L. and S.S.L. were supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Science, ICT and Future Planning (W.K.: NRF-2016R1C1B2013642; M.K.: NRF-2015R1C1A1A01052160, S.S.L.: NRF-2016R1C1B2006697) and the Ministry of Education, Science and Technology (C.W.L.: NRF-2016R1A2B4012593). A.P. acknowledges the financial support provided by a Canadian Institute for Theoretical Astrophysics (CITA) National Fellowship. J.C.M. acknowledges support from the European Research Council under the European Community's Horizon 2020 framework program (2014–2020) via the ERC Consolidator grant "From Cloud to Star Formation (CSF)" (project number 648505). This research has made use of the NASA Astrophysics Data System. K.Q. acknowledges support from National Natural Science Foundation of China (NSFC) through grants NSFC 11473011 and NSFC 11590781. S.P.L., E.C., T.C.C., and J.W.W. are grateful for the support of the Ministry of Science and Technology (MOST) of Taiwan, through grants 102-2119-M-007-004-MY3, 104-2119-M-007-021, 105-2119-M-007-022-MY3, and 105-2119-M-007-024. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.
This is the final version of the article. Available from American Astronomical Society via the DOI in this record.
Vol. 842 (1), article 66