Abstract
Diffuse interstellar bands (DIBs) are ubiquitously observed towards reddened stars throughout the Milky Way. In the past decade, DIBs have been observed in only a few extra‐galactic lines of sight. The carriers of DIBs are likely large organic gas phase molecules that reside in the diffuse interstellar medium. However, ever since they were first observed in the 1920s their identity remains a mystery. Investigated candidate carriers include, but are not limited to, carbon chains, polycyclic aromatic hydrocarbons (PAHs), fullerenes and tubular PAHs. Recent advances and successes in laboratory and theoretical work have given a great boost to the study of large molecules under interstellar conditions, i.e. low temperature, gas phase. We present here a short overview of our recent (extra)‐galactic DIBs observations and the related studies of PAH chemistry in these environments.
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