First results from BISTRO -- a SCUBA-2 polarimeter survey of the Gould
  Belt
  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 (SCUBA-2) camera, with its associated polarimeter (POL-2), on the James
Clerk Maxwell Telescope (JCMT) in Hawaii. We discuss the survey's aims and
objectives. We describe the rationale behind the survey, and the questions
which 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 'hour-glass' 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 north-eastern
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.
