Open AccessDoppler splitting in diffuse interstellar bands
Author(s) -
Weselak T.,
Galazutdinov G. A.,
Han Inwoo,
Krełowski J.
Publication year - 2010
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2009.15729.x
Subject(s) - physics , doppler effect , rest frame , astrophysics , spectral line , interstellar medium , wavelength , line (geometry) , radial velocity , astronomy , atomic physics , galaxy , optics , stars , geometry , mathematics , redshift
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.