HCO(+) observations of the molecular cloud HH24-27

Astronomy and Astrophysics – Astrophysics

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Formyl Ions, Interstellar Gas, Molecular Clouds, Molecular Spectra, Carbon Monoxide, Herbig-Haro Objects, Orion Nebula

Scientific paper

Observations of the J = 1 - 0 and J = 3 - 2 transitions of HCO+ in the molecular cloud HH24-26 are consistent with a morphology of a disk structure with bipolar outflow normal to the disk. However, estimates of the molecular hydrogen density ≡106cm-3 for the disk deduced from HCO+ are not consistent with the estimates ≡104cm-3 deduced from ammonia observations, although the distribution of emission in NH3 and HCO+ is similar. Reconciliation of the differences seems to require the presence of many small clumps within the source. As the gas pressure for a particle density ≡104cm-3 does not appear capable of confining the observed bipolar outflows it is suggested that such clumps, elongated in a similar manner to the overall distribution, may be responsible for such channelling.

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