Doppler splitting in diffuse interstellar bands

Details Doppler splitting in diffuse interstellar bands Doppler splitting in diffuse interstellar bands

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mnras.401.1308w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 401, Issue 2, pp. 1308-1314.

Astronomy and Astrophysics

Astronomy

Ism: Molecules

Scientific paper

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 HD147889. Our results strongly support a molecular origin of diffuse bands.

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