Remnants of massive metal-poor stars: viable engines for ultra-luminous X-ray sources
Abstract
Massive metal-poor stars might end their life by directly collapsing into massive (~25-80 Msun) black holes (BHs). We derive the number of massive BHs (NBH) that are expected to form per galaxy via this mechanism. We select a sample of 66 galaxies with X-ray coverage, measurements of the star formation rate (SFR) and of the metallicity. We find that NBH correlates with the number of observed ultra-luminous X-ray sources (ULXs) per galaxy (NULX) in this sample. We discuss the dependence of NULX and of NBH on the SFR and on the metallicity.
Turn this paper into a lesson
ArcXiv compiles a structured reading guide from this paper's metadata: plain-English importance, contributions, prerequisite concepts, which sections to read first, flashcards, and a quiz. Grounded in the abstract, never invented.