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

Walker, G. A. H. and Campbell, E. K. and Maier, J. P. and Bohlender, D.. (2017) The 9577 and 9632 Å Diffuse Interstellar Bands: C60+ as Carrier. Astrophysical Journal, 843 (1). p. 56.

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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 C60+ 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 C60+. 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 C60+ electronic absorption band profiles, and their relative intensities, are also considered.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Former Organization Units Chemistry > Physikalische Chemie (Maier)
UniBasel Contributors:Maier, John Paul and Campbell, Ewen
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:IOP Publishing
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:05 Jan 2018 13:30
Deposited On:05 Jan 2018 13:30

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