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We used the Nobeyama 45 m radio telescope to reveal spatial distributions ofCCS and HC$_3$N in L1147, one of carbon-chain producing regions (CCPRs)candidates, where carbon-chain molecules are dominant rather than NH$_3$. Wefound that three cores (two CCS cores and one HC$_3$N core) exist along theNE-SW filament traced by the 850 micron dust continuum, which are away from aVery Low Luminosity Object (VeLLO - a source that may turn into sub-stellarmass brown dwarf). The column densities of CCS are 3-7x10$^{12}$ cm$^{-2}$ andthose of HC$_3$N are 2-6x10$^{12}$ cm$^{-2}$, respectively, much lower thanthose previously reported towards other CCPRs. We also found that two CCS peaksare displaced from that of HC$_3$N. In order to interpret such interleaveddistributions, we conducted chemical reaction network simulations, and foundthat slightly different gas densities could lead to large variation ofCCS-to-HC$_3$N ratio in the early phase of dark cloud evolution. Such achemical "variation" may be seen in other CCPRs. Finally we were able toconfirm that the L1147 filament can be regarded as a CCPR.

Distribution of CCS and HC3N in L1147, an Early Phase Dark Cloud