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http://dspace.mediu.edu.my:8181/xmlui/handle/10261/2608| Title: | Search for anions in molecular sources: C4H- detection in L1527 |
| Keywords: | Astrochemistry Interstellar Medium: molecules Interstellar Medium: individual (L1527) Radio lines: Interstellar Medium |
| Description: | Based on observations carried out with the IRAM 30 m telescope. IRAM is supported by INSU/CNRS (France), MPG (Germany) and
IGN (Spain).-- Accepted for publication in Astronomy & Astrophysics Letters. We present the results of a search for the negative ion C4H- in various dark clouds, low mass star-forming regions and photon-dominated regions (PDRs). We have also searched for C6H-, C2H- and CN- in some of the sources. The millimeter-wave observations were carried out with the IRAM-30m telescope. We detect C4H-, through the J = 9-8 and J = 10-9 rotational transitions, in the low mass star-forming region L1527. We thus confirm the tentative detection of the J = 9-8 line recently reported toward this source. The [C4H-]/[C4H] ratio found is 0.011 %, which is slightly lower than the value observed in IRC +10216, 0.024 %, but above the 3 sigma upper limit we derive in TMC-1, < 0.0052 %. We have also derived an upper limit for the [C6H-]/[C6H] ratio in the Horsehead Nebula, and for various anion-to-neutral ratios in the observed sources. These results are compared with recent chemical models. This work has been supported by Spanish MEC trough grants AYA2003-2785, AYA2006-14876 and ESP2004-665 and by Spanish CAM under PRICIT project S-0505/ESP-0237 (ASTROCAM). MA also acknowledges grant AP2003-4619 from Spanish MEC. SI |
| URI: | http://dspace.mediu.edu.my:8181/xmlui/handle/10261/2608 |
| Other Identifiers: | arXiv:0712.1174v1 http://hdl.handle.net/10261/2608 |
| Appears in Collections: | Digital Csic |
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