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The depletion of NO in pre-protostellar cores | | Meltem Akyilmaz
; David Flower
; Pierre Hily-Blant
; G. Pineau Des forêts
; Malcolm Walmsley
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11 Jan 2007 | | Abstract: | Understanding the depletion of heavy elements is a fundamental step towards determining the structure of pre-protostellar cores just prior to collapse. We study the dependence of the NO abundance on position in the pre-protostellar cores L1544 and L183. We observed the 150 GHz and 250~GHz transitions of NO and the 93 GHz transitions of NTHP towards L1544 and L183 using the IRAM 30 m telescope. We compare the variation of the NO column density with position in these objects with the H column density derived from dust emission measurements. We find that NO behaves differently from NTHP and appears to be partially depleted in the high density core of L1544. Other oxygen-containing compounds are also likely to be partially depleted in dense-core nuclei. The principal conclusions are that: the prestellar core L1544 is likely to be ’carbon-rich’; the nitrogen chemistry did not reach equilibrium prior to gravitational collapse, and nitrogen is initially (at densities of the order of $10^4$~cm$^{-3}$) mainly in atomic form; the grain sticking probabilities of atomic C, N and, probably, O are significantly smaller than unity. | | Source: | arXiv, astro-ph/0701349 | | Services: | Forum | Review | PDF | Favorites | |
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