A search for cloud cores affected by shocked carbon chain chemistry in L1251

Abstract

We searched for shocked carbon chain chemistry (SCCC) sources with C 3 S abundances surpassing those of HC 5 N towards the dark cloud L1251, using the Effelsberg telescope at K-band (18 -26 GHz). L1251-1 and L1251-3 are identified as the most promising SCCC sources. The two sources harbor young stellar objects. We conducted mapping observations towards L1251-A, the western tail of L1251, at λ ∼3 mm with the PMO 13.7 m and the NRO 45 m telescopes in lines of C 2 H, N 2 H + , CS, HCO + , SO, HC 3 N and C 18 O as well as in CO 3-2 using the JCMT. The spectral data were combined with archival data including Spitzer