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DIBs, Interstellar Dust, and Extinction

Published online by Cambridge University Press:  21 February 2014

G. C. Clayton
G. C. Clayton*
Affiliation:
Department of Physics & Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA email: [email protected]
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Abstract

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The relationship between DIBs and dust is still unknown. The correlation between reddening and DIB strength means that the DIBs are mixed in with the dust and gas in interstellar clouds. The DIBs are relatively stronger in the diffuse interstellar medium than in dense clouds. There is only a weak correlation between the DIBs and the UV extinction parameters including the 2175 Å bump strength and the far-UV rise. In addition, the bump dust grains are sometimes polarized, while the DIBs are not. However, observations of DIBs in the SMC show that when the 2175 Å bump is weak or missing so are the DIBs. Two of the four sightlines that deviate strongly from the CCM UV extinction in the Galaxy show weak DIBs.

Keywords

dustdiffuse interstellar bandsextinction
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S297: The Diffuse Interstellar Bands , May 2013 , pp. 147 - 152
Copyright
Copyright © International Astronomical Union 2014 

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