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Paper: Galactic Cold Cores
Volume: 418, AKARI, a Light to Illuminate the Misty Universe
Page: 403
Authors: Juleva, M.; the Planck and Herschel
Abstract: In the project Galactic Cold Cores we will study the initial phases of star formation using observations made with the Planck and Herschel satellites. Because the temperatures of pre-stellar cores are very low, even below 10 K in their central regions, the sources are not very prominent at far-infrared wavelengths. Therefore, the earlier and current infrared satellites have not yet provided comprehensive data on the distribution and properties of these pre-stellar cores that are still in an early stage of the collapse. The Planck satellite will perform a sensitive all-sky survey at wavelengths close to the peak of the cold dust emission spectrum. The resolution will be comparable to IRAS but, especially for cold cloud cores, the sensitivity will far exceed that of any previous survey. Planck will reveal the full population of Galactic pre-stellar cloud cores and will provide comprehensive statistics on their distribution in the Milky Way and on their general properties. In the study of cold cores, Herschel is a perfect companion to Planck. Once cores are located in the Planck maps, a subset of the objects will be investigated in more detail in the Herschel open time key programme Galactic Cold Cores. With Herschel the selected cores will be mapped at a resolution of ∼30” or better. The results will show to what extent the Planck targets are isolated cores or progenitors of small stellar clusters. For many cores, radial density and temperature profiles can be measured thus providing data against which models of core fragmentation and collapse can be tested.
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