PROMISING CANDIDATE. “If such objects were to experience a rapid accretion event, they would be seen as (likely off-nuclear) ultra-luminous X-ray sources (ULXs). ULXs are common in star-forming regions and are often attributed to neutron stars or stellar black holes experiencing Eddington or super-Eddington accretion, or beamed emission.” (ULXs = ultra-luminous X-ray sources).
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