GBS

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Gould Belt Survey

The Gould Belt Legacy Survey (GBS) is using three JCMT survey instruments (SCUBA-2, HARP and POL-2) to survey nearby star-forming regions (D < 500 pc). The survey includes the best known Gould’s Belt clouds – Orion, Taurus, Perseus, Serpens and Ophiuchus – as well as less well-studied local star-forming regions, and complements similar Gould Belt surveys with the Spitzer and Herschel space telescopes. The SCUBA-2 targets are half-degree regions preselected on Herschel 500 micron emission to provide a deep, uniform 450/850 micron survey. The HARP observations focus on subregions of the same clouds in 12CO, 13CO and C18O. The polarisation component of the survey is awaiting POL-2 commissioning. 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 Chandrasekhar-Fermi method;
  • Large scale magnetic fields and turbulence.

Target regions are: Orion A* / B* – Perseus* – Taurus*/Auriga – Cepheus – Serpens*/Aquila – Ophiuchus* – Pipe – IC5146 – CrA – Lupus V (* includes HARP data from GBS or GT)

The 2-year programme

The 2012-14 allocated programme focusses on SCUBA-2: the HARP data were observed in 2007-2011.

Instrument Tracer Area RMS(a) Δv
(km/s)
Weather
Grade
Time
(hrs)
SCUBA-2 450/850 micron 28 x 0.25 sq. deg. 20/5 mJy/beam 1 70
450/850 micron 67 x 0.25 sq. deg. 50/5 mJy/beam 2 342
HARP-B 12CO 5×15’x15′ 0.3K 1.0 2 250
C18O(13CO) 5×15’x15′ 0.3K (0.25K) 0.1 2
Total 662

(a)Approximate achieved sensitivities subject to variation between regions.

Results

For further information contact the coordinators: Jenny Hatchell (University of Exeter), James Di Francesco (NRC Herzberg), Derek Ward-Thompson (UCLAN) and Michiel Hogerheijde (Leiden).
gb_hst_s2_orionThe dust lanes in Orion are detected in emission by SCUBA-2 at 850 microns (red) but appear as dark features blocking the optical starlight observed by the Hubble Space Telescope map (blue). Figure Credit: Carl Salji.

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