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news:properties_of_interstellar_filaments_derived_from_herschel_planck_and_molecular_line_observations [2015/04/08 11:30] (current)
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 +Colloquium, Tuesday 26th May, 4:00pm
  
 +**Doris Arzoumanian**,​ Institut d’Astrophysique Spatial d'​Orsay,​ France ​
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 +The highly filamentary structure of the interstellar medium (ISM) is now impressively revealed by Herschel and Planck images. Previous observations have shown that clouds are filamentary,​ however, only recently the mapping capabilities of Herschel and Planck have discovered their ubiquity in the ISM. In particular, Herschel images, with their high spatial and intensity dynamic ranges, show that dense filaments are associated with the main sites of star formation, demonstrating their key role in the star formation process.
 +The analysis of the column density profiles of filaments indicates that they all share a common central width of 0.1pc, while they span a wide range in length, column density, mass per unit length. The results derived from observations tracing cold dust and gas emission, in total and polarised intensity, suggest that filaments can be divided into two families: On the one hand, low column density, unbound, and quiescent filaments mostly aligned with the magnetic field orientation,​ and on the other hand, dense, self-gravitating filaments, which fragment into star forming cores. ​
 +I will present the properties of the filamentary structures derived from Herschel, Planck, and molecular line observations,​ and I will discuss the observational constraints on the formation and evolution of interstellar filaments. ​