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2006MNRAS.369.1201W - Mon. Not. R. Astron. Soc., 369, 1201-1210 (2006/July-1)
SCUBA observations of the Horsehead nebula - what did the horse swallow?
WARD-THOMPSON D., NUTTER D., BONTEMPS S., WHITWORTH A. and ATTWOOD R.
Abstract (from CDS):
Furthermore, we find evidence for a lozenge-shaped clump in the `throat' of the horse, which is not seen in emission at shorter wavelengths. We label this source B33-SMM2 and find that it is brighter at submillimetre wavelengths than B33-SMM1. We calculate the physical parameters of SMM2 and find it has a mass of ∼4M☉in a region 0.15x0.07pc, with a peak volume density of ∼2x106/cm3 and peak column density of ∼9x1022/cm2. SMM2 is seen in absorption in the 6.75-µm ISO data, from which we obtain an independent estimate of the column density in excellent agreement with that calculated from the submillimetre emission. We calculate the stability of this core against collapse and find that it is in approximate gravitational virial equilibrium. This is consistent with it being a pre-existing core in B33, possibly pre-stellar in nature, but that it may also eventually undergo collapse under the effects of the Hii region.
Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS
Journal keyword(s): stars: formation - ISM: clouds - ISM: individual: B33 - ISM: individual: Horsehead nebula - submillimetre
Nomenclature: Table 1: [WNB2006] B33-SMMN (Nos SMM1, SMM2).
Simbad objects: 13
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