Search for anions in molecular sources : C 4 H − detection in L 1527 ⋆

Aims. We present the results of a search for the negative ion C 4H in various dark clouds, low mass star-forming regions and ph otondominated regions (PDRs). We have also searched for C 6H, C2H and CN in some of the sources. Methods. The millimeter-wave observations were carried out with the IRAM-30m telescope. Results. We detect C4H, through the J= 9-8 and… (More)