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CN in prestellar cores | | Pierre Hily-Blant
; Malcolm Walmsley
; G. Pineau Des Forêts
; David Flower
; | | Date: |
18 Jan 2008 | | Abstract: | Determining the structure of and the velocity field in prestellar cores is
essential to understanding protostellar evolution.} {We have observed the dense
prestellar cores L 1544 and L 183 in the $N = 1 o 0$ rotational transition of
CN and hcn in order to test whether CN is depleted in the high--density
nuclei of these cores.} {We have used the IRAM 30 m telescope to observe along
the major and minor axes of these cores. We compare these observations with the
1 mm dust emission, which serves as a proxy for the hydrogen column
density.}{We find that while CNjone is optically thick, the distribution of
hcnjone intensity follows the dust emission well, implying that the CN
abundance does not vary greatly with density. We derive an abundance ratio of
$
m [CN]/[hh]=dix{-9}$ in L 183 and 1-3 dix{-9} in L 1544, which, in the
case of L 183, is similar to previous estimates obtained by sampling
lower--density regions of the core.}{We conclude that CN is not depleted
towards the high--density peaks of these cores and thus behaves like the
N-containing molecules
nhp and
hhh. CN is, to our knowledge, the first
C--containing molecule to exhibit this characteristic. | | Source: | arXiv, 0801.2876 | | Services: | Forum | Review | PDF | Favorites | |
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