SIMBAD references

We have mapped the NH₃(1,1) and (2,2) transitions towards the L 1251 dark cloud . Our observations covered an area of 0.12 square degrees sampled at intervals of 80" (2 times the HPBW). We detected eight ammonia cores with typical sizes (at half power) of 2' (0.2pc at 350pc distance). We estimate that the cores have a maximum H₂ density of order 10⁵cm^–3 and average T_kin of 10K. Their masses are in the range of 5-34M_☉ and they typically are close to virial equilibrium, By comparison with earlier maps of C¹⁸O, we estimate the fraction of the cloud material in the form of dense (>10⁴cm^–3) cores to be of order 40 percent.