3mm & 2mm maps of seven cores in L1495 filament

CO adsorption correlates with volume density in cold cores, and, in nearby molecular clouds, catastrophic CO freeze-out happens at volume densities above 10^4^cm^-3^. The methanol production rate is maximized there and its freeze-out rate does not overcome its production rate, while the molecules are shielded from UV destruction by gas and dust.

Thus, in cold cores, methanol abundance should generally correlate with visual extinction, which depends on both volume and column density. In this work, we test the most basic model prediction that maximum methanol abundance is associated with a local A_V_~4mag in dense cores and constrain the model parameters with the observational data. With the IRAM 30m antenna, we mapped the CH_3_OH(2-1) and (3-2) transitions toward seven dense cores in the L1495 filament in Taurus to measure the methanol abundance.