2006ApJ...653..383J

We present results from a 2300 arcmin² survey of the Orion A molecular cloud at 450 and 850 µm using the Submillimeter Common-User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope. The region mapped lies directly south of the OMC 1 cloud core and includes OMC 4, OMC 5, HH 1/2, HH 34, and L1641N. We identify 71 independent clumps in the 850 µm map and compute size, flux, and degree of central concentration in each. Comparison with isothermal, pressure-confined, self-gravitating Bonnor-Ebert spheres implies that the clumps have internal temperatures T_d∼22±5 K and surface pressures log(k^–1 P cm^–3 K)=6.0±0.2. The clump masses span the range 0.3-22 M_☉assuming a dust temperature T_d∼20 K and a dust emissivity κ₈₅₀=0.02 cm²/g. The distribution of clump masses is well characterized by a power law N(M)∝M^–α with α=2.0±0.5 for M>3.0 M_☉, indicating a clump mass function steeper than the stellar initial mass function. Significant incompleteness makes determination of the slope at lower masses difficult. A comparison of the submillimeter emission map with an H₂2.122 µm survey of the same region is performed. Several new Class 0 sources are revealed and a correlation is found between both the column density and degree of concentration of the submillimeter sources and the likelihood of coincident H₂shock emission.