Endpoints of stellar evolution: The incidence of stellar mass black holes in the galaxy

Astronomy and Astrophysics – Astronomy

Scientific paper

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Black Holes (Astronomy), Stellar Evolution, X Ray Binaries, Milky Way Galaxy, Stellar Mass

Scientific paper

The various possible endpoints of stellar evolution are discussed. Special consideration is given to the question of the number of stellar mass black holes present in the galaxy. From stellar evolution considerations together with the incidence of Low Mass X-ray Binaries that contain black holes it is argued that the number of stellar mass (approximately 5 to 15 solar mass) black holes in the Galaxy must be of order 10 to eighth power. Even if all helium in the Universe had been made in an early population of very massive stars, the number of stellar mass black holes in the Galaxy would not exceed 6 times 10 to the 9th power.

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