Journal Article

Doppler splitting in diffuse interstellar bands

T. Weselak, G. A. Galazutdinov, Inwoo Han and J. Krełowski

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 401, issue 2, pages 1308-1314
Published in print January 2010 | ISSN: 0035-8711
Published online January 2010 | e-ISSN: 1365-2966 | DOI:
Doppler splitting in diffuse interstellar bands

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We demonstrate evident Doppler splitting in the profiles of many narrow diffuse interstellar bands (DIBs). Their components are compared with those of atomic and molecular lines of interstellar origin. It is shown that it is likely that the species that shares both wavelength shifts and strength ratios of the Doppler components seen in the DIB profiles is the CH radical. Because of this profile resemblance, it is recommended that CH lines can be used to shift spectra to the rest velocity frame for interstellar features, especially to determine the DIB rest wavelengths on the basis of the CH line at 4300.3132 Å in the spectrum of HD 147889. Our results strongly support a molecular origin of diffuse bands.

Keywords: ISM: molecules

Journal Article.  3522 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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