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We present 2D Monte Carlo radiative transfer simulations of prestellar cores.We consider two types of asymmetry: disk-like asymmetry, in which the core isdenser towards the equatorial plane than towards the poles; and axialasymmetry, in which the core is denser towards the south pole than the northpole. We limit our treatment to cores with mild asymmetries, which are exposeddirectly to the interstellar radiation field or are embedded inside molecularclouds.  The isophotal maps of a core depend strongly on the viewing angle. Maps atwavelengths longer than the peak of the SED (e.g. 850 micron) essentially tracethe column-density. Thus, for instance, cores with disk-like asymmetry appearelongated when mapped at 850 micron from close to the equatorial plane.However, at wavelengths near the peak of the SED (e.g. 200 micron), theemissivity is more strongly dependent on the temperature, and therefore, atparticular viewing angles, there are characteristic features which reflect amore complicated convolution of the density and temperature fields within thecore.  These characteristic features are on scales 1/5 to 1/3 of the overall coresize, and so high resolution observations are needed to observe them. They arealso weaker if the core is embedded in a molecular cloud (because the range oftemperature within the core is then smaller), and so high sensitivity is neededto detect them. Herschel, to be launched in 2007, will in principle provide thenecessary resolution and sensitivity at 170 to 250 micron.

Radiative transfer models of non-spherical prestellar cores