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Observations carried out toward starless and pre-stellar cores have revealedthat complex organic molecules are prevalent in these objects, but it isunclear what chemical processes are involved in their formation. Recently, ithas been shown that complex organics are preferentially produced at anintermediate-density shell within the L1544 pre-stellar core at radialdistances of ~4000 au with respect to the core center. However, the spatialdistribution of complex organics has only been inferred toward this core and itremains unknown whether these species present a similar behaviour in othercores. We report high-sensitivity observations carried out toward two positionsin the L1498 pre-stellar core, the dust peak and a position located at adistance of ~11000 au from the center of the core where the emission ofCH$_3$OH peaks. Similarly to L1544, our observations reveal that smallO-bearing molecules and N-bearing species are enhanced by factors ~4-14 towardthe outer shell of L1498. However, unlike L1544, large O-bearing organics suchas CH3CHO, CH3OCH3 or CH3OCHO are not detected within our sensitivity limits.For N-bearing organics, these species are more abundant toward the outer shellof the L1498 pre-stellar core than toward the one in L1544. We propose that thedifferences observed between O-bearing and N-bearing species in L1498 and L1544are due to the different physical structure of these cores, which in turn is aconsequence of their evolutionary stage, with L1498 being younger than L1544.

The complex organic molecular content in the L1498 starless core