Context. The origin of the enormous luminosities of the two opaque nuclei of Arp 220, the prototypical ultra-luminous infrared galaxy, remains a mystery because we lack observational tools to explore the innermost regions around the nuclei.
No takes yet. Share an insight, caveat, or question.
A 2016 study studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: