Dust-temperature of an isolated star-forming cloud: Herschel observations of the Bok globule CB244

We present Herschel observations of the isolated, low-mass star-forming Bok globule CB244. It contains two cold sources, a low-mass Class 0 protostar and a starless core, which is likely to be prestellar in nature, separated by 90 '' (similar to 18 000 AU). The Herschel data sample the peak of the Planck spectrum for these sources, and are therefore ideal for dust-temperature and column density modeling. With these data and a near-IR extinction map, the MIPS 70 mu m mosaic, the SCUBA 850 mu m map, and the IRAM 1.3 mm map, we model the dust-temperature and column density of CB244 and present the first measured dust-temperature map of an entire star-forming molecular cloud. We find that the column-averaged dust-temperature near the protostar is similar to 17.7 K, while for the starless core it is similar to 10.6 K, and that the effect of external heating causes the cloud dust-temperature to rise to similar to 17 K where the hydrogen column density drops below 10(21) cm(-2). The total hydrogen mass of CB244 ( assuming a distance of 200 pc) is 15 +/- 5 M-circle dot. The mass of the protostellar core is 1.6 +/- 0.1 M-circle dot and the mass of the starless core is 5 +/- 2 M-circle dot, indicating that similar to 45% of the mass in the globule is participating in the star-formation process.