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http://dspace.mediu.edu.my:8181/xmlui/handle/10261/2631Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.creator | Pety, Jérôme | - |
| dc.creator | Teyssier, D. | - |
| dc.creator | Fosse, David | - |
| dc.creator | Gerin, M. | - |
| dc.creator | Roueff, E. | - |
| dc.creator | Abergel, A. | - |
| dc.creator | Habart, E. | - |
| dc.creator | Cernicharo, José | - |
| dc.date | 2007-12-28T11:19:17Z | - |
| dc.date | 2007-12-28T11:19:17Z | - |
| dc.date | 2005-01-17 | - |
| dc.date.accessioned | 2017-01-31T00:59:34Z | - |
| dc.date.available | 2017-01-31T00:59:34Z | - |
| dc.identifier | arXiv:astro-ph/0501339v1 | - |
| dc.identifier | Astronomy & Astrophysics 435, 885-899 (2005) | - |
| dc.identifier | 1432-0746 | - |
| dc.identifier | http://hdl.handle.net/10261/2631 | - |
| dc.identifier | 10.1051/0004-6361:20041170 | - |
| dc.identifier.uri | http://dspace.mediu.edu.my:8181/xmlui/handle/10261/2631 | - |
| dc.description | In press in Astronomy & Astrophysics. Uses aa LaTeX macros. | - |
| dc.description | We present maps at high spatial and spectral resolution in emission lines of C2H, c-C3H2, C4H, 12CO and C18O of the edge of the Horsehead nebula obtained with the Plateau de Bure Interferometer (PdBI). The edge of the Horsehead nebula is a one-dimensional Photo-Dissociation Region (PDR) viewed almost edge-on. All hydrocarbons are detected at high signal-to-noise ratio in the PDR where intense emission is seen both in the H2 ro-vibrational lines and in the PAH mid-infrared bands. C18O peaks farther away from the cloud edge. Our observations demonstrate that C2H, cC3H2 and C4H are present in UV-irradiated molecular gas, with abundances nearly as high as in dense, well shielded molecular cores. PDR models (i) need a large density gradient at the PDR edge to correctly reproduce the offset between the hydrocarbons and H2 peaks and (ii) fail to reproduce the hydrocarbon abundances. We propose that a new formation path of carbon chains, in addition to gas phase chemistry, should be considered in PDRs: because of intense UV-irradiation, large aromatic molecules and small carbon grains may fragment and feed the interstellar medium with small carbon clusters and molecules in significant amount. | - |
| dc.description | We are grateful to the IRAM staff at Plateau de Bure, Grenoble and Pico Veleta, Granada for competent help with the observations and data reduction. IRAM is supported by the INSU/CNRS (France), MPG (Germany) and IGN (Spain). We acknowledge funding by the French CNRS/PCMI program. | - |
| dc.description | Peer reviewed | - |
| dc.format | 1049977 bytes | - |
| dc.format | application/pdf | - |
| dc.language | eng | - |
| dc.publisher | EDP Sciences | - |
| dc.relation | Preprint | - |
| dc.rights | openAccess | - |
| dc.subject | ISM clouds | - |
| dc.subject | Molecules | - |
| dc.subject | Individual object (Horsehead nebula) | - |
| dc.subject | Radio lines: ISM | - |
| dc.title | Are PAHs precursors of small hydrocarbons in Photo-Dissociation Regions? The Horsehead case | - |
| dc.type | Pre-print | - |
| Appears in Collections: | Digital Csic | |
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