Physics
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.577..423t&link_type=abstract
In: Proceedings of the dusty and molecular universe: a prelude to Herschel and ALMA, 27-29 October 2004, Paris, France. Ed. by A
Physics
4
Ism, Molecular Chemistry, Horsehead Nebula
Scientific paper
We present an observational study of the abundance ratio of the cyclic and linear forms of the C3H2 hydrocarbon across the Photo-Dominated Region (PDR) of the Horsehead nebula. The study of this ratio is of particular interest as models predict a strong dependence of the ratio with the electronic abundance. Using the IRAM 30-m and the Effelsberg 100-m telescopes, we have observed cm and mm transitions of the two forms in order to retrieve molecular abundances along a cut crossing the PDR. The variation of the cyclic/linear ratio is striking, showing a plateau in the range 3-5 in the diffuse gas, and increasing by a factor of >4 as ones penetrates further the densest layers of the molecular cloud.
Cernicharo Jose
Gerin Maryvonne
Hily-Blant Pierre
Pety Jérôme
Roueff Evelyne
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