Pairwise Correlations of Eight Strong DIBs and N(H), N(H2), and EB-V

Details Pairwise Correlations of Eight Strong DIBs and N(H), N(H2), and EB-V Pairwise Correlations of Eight Strong DIBs and N(H), N(H2), and EB-V

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mwac.meet..p09f&link_type=abstract

Midwest Astrochemistry Meeting 2011, held 21-22 October at the University of Illinois at Urbana-Champaign. http://midwest.astroc

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Scientific paper

We discuss the correlations between equivalent widths of eight diffuse interstellar bands (DIBs), and examine their correlations with the column densities of atomic hydrogen (N(H)) and molecular hydrogen (N(H2)), and EB-V. The DIBs are centered at λ 5780.5, 6204.5, 6283.8, 6196.0, 6613.6, 5705.1, 5797.1, and 5487.7, in decreasing order of Pearson's correlation coefficient with N(H), which ranges from 0.94 to 0.78. The equivalent width of 5780.5 is better correlated with column density of H than with EB-V or H2, and the same is true for six of the seven other DIBs presented here. Hence, they are not preferentially located in the densest, most UV shielded parts of interstellar clouds. These eight strong DIBs are not correlated well enough with each other to suggest they come from the same carrier. However, the correlations may be useful in deriving interstellar parameters, such as N(H) from W(5780.5), when more direct methods are not available. Our future plans include mapping the distribution of DIBs in interstellar clouds, closer examination of the excellent correlation between 5705.1 and 5780.5 (almost as good as the near perfect correlation of 6613.6 with 6196.0), and precise measurements of broad DIBs.

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