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Gould Belt Survey
Gould Belt
Survey
Summary
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The Gould Belt Legacy Survey (GBS) uses three JCMT
survey instruments (SCUBA-2, HARP and POL-2) to survey
nearby star-forming regions (D < 500 pc). The SCUBA-2 targets
are well-known large molecular clouds, plus many small
clouds and isolated cores, totalling an area of 700 square degrees in a
shallow survey (of regions of Av > 1) and an area of
107 square degrees in a deep survey (of regions of A v > 3). The
HARP and POL-2 observations each have two components:
- joint
mapping of ten roughly 300 square arcminute fields in various
clouds;
- individual (follow-up) mapping of one thousand 2 x 2 arcmin fields in 12CO and four hundred 2 x 2 arcmin fields in 13CO and
C18O
with HARP and one hundred single field targets with
POL-2.
The science goals of the GBS are:
- Protostellar lifetimes and accretion rates;
- Origin of the IMF and brown dwarfs;
- Structure of cores to clouds;
- Evolutionary Classification
- Mass ejection and accretion rates;
- Core kinematics;
- Clouds and filaments;
- Tests of the standard model of star formation;
- Models of magnetic field geometry, strength and the
C-F method;
- Large scale magnetic fields and turbulence.
There is further information provided at a dedicated GBS
web-site with more information as well as a detailed 5-page
document. A restricted wiki
for discussions and announcements is available for team
members.
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The
Class 0 source L1157 mapped in C18O J=3-2 (colour-scale) with 12CO
J=3-2 contours showing the red and blue lobes of a bipolar outflow
being driven by the embedded protostar.
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The 2-year
programme
The survey is split into four components with different areas and
depths:
- SCUBA-2 shallow survey;
- SCUBA-2 deep survey;
- HARP/POL-2 cloud regions survey;
- HARP/POL-2 cores survey.
The shallow survey will be observed to a sensitivity of 10 mJy per beam
at 850 µm, while the deep survey will map simultaneously to 3 mJy per
beam at 850 µm and 12 mJy per beam at 450 µm. |
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