2008A&A...478L..19A


Query : 2008A&A...478L..19A

2008A&A...478L..19A - Astronomy and Astrophysics, volume 478, L19-22 (2008/1-4)

Search for anions in molecular sources: C4H detection in L1527.

AGUNDEZ M., CERNICHARO J., GUELIN M., GERIN M., McCARTHY M.C. and THADDEUS P.

Abstract (from CDS):

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 3σ 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.

Abstract Copyright:

Journal keyword(s): astrochemistry - ISM: molecules - radio lines: ISM

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 Barnard 1 MoC 03 33 16.3 +31 07 51           ~ 317 0
2 [HKM99] B1-b cor 03 33 20.32 +31 07 21.5           ~ 202 0
3 LDN 1527 DNe 04 39 53 +25 45.0           ~ 605 0
4 IRAS 04368+2557 Y*O 04 39 53.97816 +26 03 09.6804           ~ 271 0
5 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1620 0
6 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 841 0
7 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 504 0
8 IRC +10216 C* 09 47 57.40632 +13 16 43.5648           C9,5e 2304 0
9 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 740 1
10 LDN 483 DNe 18 17 35 -04 39.8           ~ 290 0
11 NGC 7023 RNe 21 01 36.9 +68 09 48           ~ 693 0

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2023.09.25-16:48:20

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