Pairwise Correlations Of Eight Strong DIBs And N(H), N(H2), And E(B-V)

Details Pairwise Correlations Of Eight Strong DIBs And N(H), N(H2), And E(B-V) Pairwise Correlations Of Eight Strong DIBs And N(H), N(H2), And E(B-V)

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21812910f&link_type=abstract

American Astronomical Society, AAS Meeting #218, #129.10; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

We establish correlations between equivalent widths of eight diffuse interstellar bands (DIBs), and examine their correlations with N(H), N(H2), and E(B-V). The DIBs are centered at 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 range from 0.96 to 0.82. We find the equivalent width of 5780.5 is better correlated with column densities of H than with E(B-V) or H2, confirming earlier results, and the same is true for six of the seven other DIBs presented here. Despite this similarity, the eight strong DIBs chosen are not correlated well enough with each other to suggest they come from the same carrier. These DIBs are more likely to be associated with H than with H2, and hence are not preferentially located in the densest, most UV shielded parts of interstellar clouds. 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 closer examination the excellent correlation between 5705.1 and 5780.5 (almost as good as the near perfect correlation of 6613.6 with 6196.0), and on precise measurements of broad DIBS (e.g. 4428.83, 4881.06) and inclusion of these better measurements in correlation studies with the main DIBs noted in this poster.

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