The 9577 and 9632 Å Diffuse Interstellar Bands: C60+ as Carrier

G. A. H. Walker, J. P. Maier, D. Bohlender, Ewen Campbell

Research output: Contribution to journalArticlepeer-review


Galazutdinov et al. (2017) recently claimed that the relative strengths of the 9577 and 9632 Å diffuse interstellar bands (DIBs) are too poorly correlated to be caused by a single source, the ion. Their conclusion is based on theoretical modeling of contaminating stellar Mg ii lines at 9631.9 and 9632.4 Å and UVES spectra. This contradicts their earlier result and those of several others that the two DIBs are closely correlated and, within the errors and effects of stellar blends, exhibit an intensity ratio consistent with that found in the 6 K laboratory spectrum of . We consider the use of close spectral standards to be superior to model atmosphere calculations in correcting for contamination by the Mg ii lines. We have examined some of the same UVES spectra and demonstrate that a lack of suitably observed telluric standards makes it impossible to adequately correct for telluric water vapor contamination, leading to unreliable continuum levels. The possible effects of higher temperatures, in the 30–100 K range, on the electronic absorption band profiles, and their relative intensities, are also considered.
Original languageEnglish
Pages (from-to)56
JournalAstrophysical Journal
Issue number1
Early online date3 Jul 2017
Publication statusE-pub ahead of print - 3 Jul 2017

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