The detection of interstellar C$_{ 60}^{ +}$ has been debated for 30 years. The contested attribution of a weaker DIB at 9365 { \AA} was re-evaluated here on the basis of a Pearson correlation relative to 9577 { \AA}, which was previously tied to C$_{ 60}^{ +}$ by diverse collaborations. An assessment of 11 sightlines revealed a high correlation amongst 9365$-$9577 { \AA} equivalent widths ($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$-$9632 { \AA} across a sizable baseline: three interrelated DIBs matching C$_{ 60}^{ +}$ laboratory findings were independently reaffirmed (9365, 9577, 9632 { \AA}). 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).
Categories: astro-ph.GA