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Diffuse Interstellar Bands: How are they related to known Gas-Phase Constituents of the ISM?

Published online by Cambridge University Press:  21 February 2014

D. E. Welty
D. E. Welty*
Affiliation:
University of Chicago, Astronomy & Astrophysics Center, 5640 S. Ellis Ave., Chicago, IL 60637, USA email: dwelty@oddjob.uchicago.edu
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Abstract

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In this brief review of recent work relating the DIBs to other gas-phase constituents of the ISM, we explore correlations between DIB equivalent widths and the column densities of various atomic and molecular species, drawn from a large database constructed for that purpose. The tightness and slopes of the correlations can provide information on how the DIBs might be related to those species (physically, chemically, spatially) and on various properties of the DIB carriers. Deviations from the mean relationships can reveal dependences of DIB strengths on other parameters, regional variations in DIB behavior, and individual sight lines where unusual environmental conditions affect the DIBs. Variations in DIB profiles (e.g., wings, substructure) and relative strengths may be related to differences in physical conditions inferred from atomic and/or molecular absorption lines.

Keywords

ISM: abundancesISM: atomsmoleculesISM: lines and bandsISM: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S297: The Diffuse Interstellar Bands , May 2013 , pp. 153 - 162
Copyright
Copyright © International Astronomical Union 2014 

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