Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.280.1293g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. Vol. 280, No. 4, p. 1293 - 1296
Astronomy and Astrophysics
Astronomy
1
Stars: Formation -- Ism: Clouds -- Ism: Individual: Omc1, Molecular Clouds: Protostars, Molecular Clouds: Carbon Monosulfide, Molecular Clouds: Core Formation, Molecular Clouds: Star Formation, Protostars: Gas Densities
Scientific paper
The transitions CS and C34S J = 10-9, at a wavelength of 0.6 mm, have been detected for the first time in cool cloud cores. Two sources in OMC1-North were observed, both of which are candidates to contain young stars. C34S data including the J = 10-9, J = 7-6 and J = 5-4 transitions have been analysed with a radiative transfer model to estimate the densities in the cores, and the peak n(H2) values are found to be approximately 2×106cm-3. Estimated core masses are ≡4 and 8 Msun, and thus, if most of the dense material is accreted, high-mass stars will form. The n(H2) values are very similar to those found in much hotter cloud cores containing luminous young stellar objects, observed previously in high-J C34S lines by Hauschildt et al. (1994), indicating that mean gas densities over radii of a few thousand AU do not change significantly as the central star forms.
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