SIMBAD references

2000ApJ...545..327J - Astrophys. J., 545, 327-339 (2000/December-2)

Large-area mapping at 850 microns. II. Analysis of the clump distribution in the ρ Ophiuchi molecular cloud.

JOHNSTONE D., WILSON C.D., MORIARTY-SCHIEVEN G., JONCAS G., SMITH G., GREGERSEN E. and FICH M.

Abstract (from CDS):

We present results from a survey of the central 700 arcmin2 region of the ρ Ophiuchi molecular cloud at 850 µm using the Submillimeter Common-User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope. Using the clump-finding procedure developed by Williams et al., we identify 55 independent objects and compute size, flux, and degree of central concentration. Comparison with isothermal, pressure-confined, self-gravitating Bonnor-Ebert spheres implies that the clumps have internal temperatures of 10-30 K and surface pressures P/k=106–7 K.cm–3, consistent with the expected average pressure in the ρ Ophiuchi central region, P/k∼2x107 K.cm–3. The clump masses span 0.02-6.3 M assuming a dust temperature Td∼20 K and a dust emissivity κ850=0.01 cm2.g–1. The distribution of clump masses is well characterized by a broken power law, N(M)∝M–α, with α=1.0-1.5 for M>0.6 M and α=0.5 for M≤0.6 M, although significant incompleteness may affect the slope at the lower mass end. This mass function is in general agreement with the ρ Ophiuchi clump mass function derived at 1.3 mm by Motte et al. The two-point correlation function of the clump separations is measured and reveals clustering on size scales r<3x104 AU with a radial power-law exponent γ=0.75.

Abstract Copyright:

Journal keyword(s): Infrared: ISM: Continuum - ISM: individual:(ρ Ophiuchi) - ISM: Structure - Stars: Formation - Submillimeter

Nomenclature: Table 1: [JWM2000] SMM JHHMMm-DDMMa N=55.

CDS comments: in ref list Maddox et al 1990MNRAS.242p.43 instead of 242.43

Simbad objects: 73

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