Diffuse interstellar clouds


alt label
Translucent interstellar clouds
dcterms modified equal to or less than 2020-10-27T13:39:05.772Zequal to or more than 2020-10-27T13:39:05.772Z
http://astrothesaurus.org/uat/834 original
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definition An interstellar cloud in which hydrogen is completely dissociated and which is less dense and dusty than molecular clouds. In diffuse interstellar clouds photoabsorption of the background ultraviolet (UV) radiation field is an important dissociating and ionizing process. Typical densities and temperatures of diffuse clouds are 10^2 to 10^3 cm^-3 and 20 to 100 K respectively. Because of modest extinctions (≤ 1 mag), photodissociation processes are important in diffuse clouds preventing the formation of larger molecules.
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contributor AAS_Frey.Katie original