Complex Structure in Two Diffuse Interstellar Bands

Details Complex Structure in Two Diffuse Interstellar Bands Complex Structure in Two Diffuse Interstellar Bands

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...274..465j&link_type=abstract

Astronomy and Astrophysics, Vol. 274, NO. 2/JUL(II), P. 465, 1993

Astronomy and Astrophysics

Astrophysics

22

Dust, Extinction, Diffuse Interstellar Bands, Interstellar Medium

Scientific paper

The two strongest diffuse interstellar bands in terms of depth, those at 5780 Å and 6284 Å, show a complex shape with significant structure. In particular, many new weak features are clearly detected at irregular intervals superposed on a background absorption.
These features are tentatively assigned to either the main diffuse band (λ578O, λ6284) or to the nearby bands λ5797 and λ6296 respectively, which belong to a different family. All features that correlate well with the main bands form a complex profile. The shapes of these complex bands at 5780 and 6284 Å, including the asymmetries in the features, show some striking similarities (Fig. 10). This reduces the likelihood that the features are merely a chance superposition of unrelated absorptions. The main bands are well correlated and could come from the same carrier.
Possible interpretations of the complex structures are given, assuming that (large) unidentified molecules are the carriers.

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