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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2509.08414 |
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| _version_ | 1866911147256446976 |
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| author | Majaess, Daniel Harriott, Tina A. Seuret, Halis Morera-Boado, Cercis Massa, Lou Matta, Cherif F. |
| author_facet | Majaess, Daniel Harriott, Tina A. Seuret, Halis Morera-Boado, Cercis Massa, Lou Matta, Cherif F. |
| contents | The detection of interstellar C$_{60}^{+}$ has been debated for 30 years. The contested attribution of a weaker DIB at 9365 Å was re-evaluated here on the basis of a Pearson correlation relative to 9577 Å, which was previously tied to C$_{60}^{+}$ by diverse collaborations. An assessment of 11 sightlines revealed a high correlation amongst 9365$-$9577 Å equivalent widths ($r=0.93 \pm 0.05$), after contamination from an adjacent line was mitigated using both numerical integration and Gaussian fits. In tandem with a recent separate study's high-$r$ evaluation linking 9577$-$9632 Å across a sizable baseline: three interrelated DIBs matching C$_{60}^{+}$ laboratory findings were independently reaffirmed (9365, 9577, 9632 Å). Yet further investigations are required to strengthen the case via two other weak DIBs disputedly linked to C$_{60}^{+}$, particularly owing to potential overlapping lines arising from an expansive chemical space (PAHs). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_08414 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Critical 9365 Å Diffuse Interstellar Band and C$_{60}^{+}$ Association Majaess, Daniel Harriott, Tina A. Seuret, Halis Morera-Boado, Cercis Massa, Lou Matta, Cherif F. Astrophysics of Galaxies The detection of interstellar C$_{60}^{+}$ has been debated for 30 years. The contested attribution of a weaker DIB at 9365 Å was re-evaluated here on the basis of a Pearson correlation relative to 9577 Å, which was previously tied to C$_{60}^{+}$ by diverse collaborations. An assessment of 11 sightlines revealed a high correlation amongst 9365$-$9577 Å equivalent widths ($r=0.93 \pm 0.05$), after contamination from an adjacent line was mitigated using both numerical integration and Gaussian fits. In tandem with a recent separate study's high-$r$ evaluation linking 9577$-$9632 Å across a sizable baseline: three interrelated DIBs matching C$_{60}^{+}$ laboratory findings were independently reaffirmed (9365, 9577, 9632 Å). Yet further investigations are required to strengthen the case via two other weak DIBs disputedly linked to C$_{60}^{+}$, particularly owing to potential overlapping lines arising from an expansive chemical space (PAHs). |
| title | The Critical 9365 Å Diffuse Interstellar Band and C$_{60}^{+}$ Association |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2509.08414 |