Dust Evolution in the Cold and Diffuse Interstellar Medium: The Herschel Perspective

Astronomy and Astrophysics – Astronomy

Scientific paper

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Interstellar Medium, Infrared, Dust, Turbulence, Herschel

Scientific paper

The PACS and SPIRE instruments of Herschel combine the sensitivity, the spectral coverage, the angular resolution and the mapping efficiency to provide a full picture, of the evolution of large dust grains from cirrus to dense cores. This evolution is though to result from accretion, coagulation and fragmentation processes, that depends on the density structure of the ISM, the amplitude of the turbulent motions and the excitation conditions. The far-infrared and sub-millimeter emission maps provided by Herschel will allow us 1) to characterize the structure of the interstellar medium, 2) to study the evolution of dust and its relation with the gas phase properties and 3) it will also provide important informations on the statistical properties of the dust emission which are crucial for the detection of proto-stellar cores and for the study of extra-galactic emission. Such maps will also be a key input to the components separation for Planck. The combination of Herschel observations with IRAS, ISO, SIRTF and ASTRO-F data will reveal the whole spectral energy distribution (SED) of dust and will allow to characterize the complete dust size distribution and study the dust-gas relation.

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