Abstract
Abstract We carried out an unbiased mapping survey of dense molecular cloud cores traced by the NH$_3$ (1,1) and (2,2) inversion lines in the GF9 filament, which contains an extremely young low-mass protostar, GF9-2 (2006, ApJ, 653, 1369). The survey was conducted using the Nobeyama 45m telescope over a region of $\sim$1.5D$\times$1$^{\circ}$ with an angular resolution of 73". The large-scale map revealed that the filament contains at least 7 dense cores, as well as 3 possible ones, located at regular intervals of $\sim$0.9pc. Our analysis shows that these cores have kinetic temperatures of $\lesssim$10K and LTE-masses of 1.8-8.2M⊙, which makes them typical sites of low-mass star formation. All of the identified cores are likely to be gravitationally unstable, because their LTE-masses are larger than their virial masses. Since the LTE-masses and separations of the cores are consistent with the Jeans masses and lengths, respectively, for the low-density ambient gas, we argue that the identified cores formed via the gravitational fragmentation of the natal filamentary cloud.
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