Planck early results
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The SED of representative source classes in the ERCSC. The plot shows a pre-stellar core L1544, an extragalactic radio source Centaurus A, a synchrotron dominated radio galaxy Pictor A, IRC+10216 which is the prototype of stars with dust shells, the starbursting ultraluminous infrared galaxy Arp 220 and the cold stellar core ECC G176.52-09.80. IRAS or ISO flux densities are shown as solid squares while the Planck flux densities are shown as stars. The Planck ERCSC enables a diverse class of sources to be studied over a broad range of frequencies and flux densities.

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