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- W4212920908 abstract "ABSTRACT Ever since they were first detected over 100 yr ago, the mysterious diffuse interstellar bands (DIBs), a set of several hundred broad absorption features seen against distant stars in the optical and near-infrared wavelength range, largely remain unidentified. The close match, both in wavelengths and in relative strengths, recently found between the experimental absorption spectra of gas-phase buckminsterfullerene ions (C$_{60}^{+}$) and four DIBs at $lambda 9632, {rm mathring{rm A}}$, $lambda 9577, {rm mathring{rm A}}$, $lambda 9428, {rm mathring{rm A}}$ and $lambda 9365, {rm mathring{rm A}}$ (and, to a lesser degree, a weaker DIB at $lambda 9348, {rm mathring{rm A}}$) suggests that C$_{60}^{+}$ is a promising carrier for these DIBs. However, arguments against the C$_{60}^{+}$ identification remain and are mostly concerned with the large variation in the intensity ratios of the $lambda 9632, {rm mathring{rm A}}$ and $lambda 9577, {rm mathring{rm A}}$ DIBs. In this work, we search for these DIBs in the X-shooter archival data of the European Southern Observatory’s Very Large Telescope, and we identify the $lambda 9632, {rm mathring{rm A}}$, $lambda 9577, {rm mathring{rm A}}$, $lambda 9428, {rm mathring{rm A}}$ and $lambda 9365, {rm mathring{rm A}}$ DIBs in a sample of 25 stars. While the $lambda 9428, {rm mathring{rm A}}$ and $lambda 9365, {rm mathring{rm A}}$ DIBs are too noisy to allow any reliable analysis, the $lambda 9632, {rm mathring{rm A}}$ and $lambda 9577, {rm mathring{rm A}}$ DIBs are unambiguously detected and, after correcting for telluric water vapour absorption, their correlation can be used to probe their origin. To this end, we select a subsample of nine hot, O- or B0-type stars of which the stellar Mg ii contamination to the $lambda 9632, {rm mathring{rm A}}$ DIB is negligibly small. We find that their equivalent widths, after being normalized by reddening to eliminate their common correlation with the density of interstellar clouds, exhibit a tight, positive correlation, supporting C$_{60}^{+}$ as the carrier of the $lambda 9632, {rm mathring{rm A}}$ and $lambda 9577, {rm mathring{rm A}}$ DIBs." @default.
- W4212920908 created "2022-02-24" @default.
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- W4212920908 date "2021-11-12" @default.
- W4212920908 modified "2023-09-28" @default.
- W4212920908 title "C60 cation as the carrier of the λ 9577 Å and λ 9632 Å diffuse interstellar bands: further support from the VLT/X-Shooter spectra" @default.
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- W4212920908 doi "https://doi.org/10.1093/mnras/stab3296" @default.
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