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Galactic Far-Infrared Diffuse Emission

Published online by Cambridge University Press:  13 May 2016

François Boulanger ,
Jean-Philippe Bernard ,
Guilaine Lagache  and
Bertrand Stepnik
François Boulanger
Affiliation:
Institut d'Astrophysique Spatiale, Université Paris XI, batiment 121, 91405 Orsay, France
Jean-Philippe Bernard
Affiliation:
Institut d'Astrophysique Spatiale, Université Paris XI, batiment 121, 91405 Orsay, France
Guilaine Lagache
Affiliation:
Institut d'Astrophysique Spatiale, Université Paris XI, batiment 121, 91405 Orsay, France
Bertrand Stepnik
Affiliation:
Institut d'Astrophysique Spatiale, Université Paris XI, batiment 121, 91405 Orsay, France

Abstract

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We review the present understanding of the interstellar dust contribution to the far-IR (λ > 100 μm) sky emission. We show how the contribution from the distinct ISM components (HI, H2, HII gas) are identified and characterized through spatial correlation with gas emission lines. We discuss the spectral energy distribution of the emission from cirrus dust associated with diffuse HI gas and from colder dust associated with molecular gas. We relate the drop in dust emission temperature from the diffuse interstellar medium to molecular gas to an evolution of dust affecting both the abundance of small dust grains and the far-IR emissivity of large grains.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 204: The Extragalactic Infrared Background and its Cosmological Implication , 2001 , pp. 47 - 55
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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