| dc.creator |
Agúndez, Marcelino |
|
| dc.creator |
Cernicharo, José |
|
| dc.creator |
Guélin, Michel |
|
| dc.creator |
Gerin, M. |
|
| dc.creator |
McCarthy, M. C. |
|
| dc.creator |
Thaddeus, P. |
|
| dc.date |
2007-12-26T16:08:25Z |
|
| dc.date |
2007-12-26T16:08:25Z |
|
| dc.date |
2007-12-07 |
|
| dc.date.accessioned |
2017-01-31T00:59:32Z |
|
| dc.date.available |
2017-01-31T00:59:32Z |
|
| dc.identifier |
arXiv:0712.1174v1 |
|
| dc.identifier |
http://hdl.handle.net/10261/2608 |
|
| dc.identifier.uri |
http://dspace.mediu.edu.my:8181/xmlui/handle/10261/2608 |
|
| dc.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. |
|
| dc.description |
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. |
|
| dc.description |
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. |
|
| dc.description |
SI |
|
| dc.format |
111697 bytes |
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| dc.format |
application/pdf |
|
| dc.language |
eng |
|
| dc.relation |
Preprint |
|
| dc.rights |
openAccess |
|
| dc.subject |
Astrochemistry |
|
| dc.subject |
Interstellar Medium: molecules |
|
| dc.subject |
Interstellar Medium: individual (L1527) |
|
| dc.subject |
Radio lines: Interstellar Medium |
|
| dc.title |
Search for anions in molecular sources: C4H- detection in L1527 |
|
| dc.type |
Pre-print |
|