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Q& A: Black Holes

Q:
Schematic diagram
click to enlarge
Schematic diagram of the 14 dynamically confirmed black hole binaries with low mass companions (i.e. stars with masses less than about 3 solar masses). The color scale represents the temperature of the star. Credit: Jerome A. Orosz, Utrecht University (The Netherlands).
Can you tell me what is the distance between the XTEJ1118+480 black hole and its companion star?


A:
The distance from the black hole XTE J1118+480 has been estimated to be 1.9 million kilometers. See the accompanying sketch. Reference: J. McClintock et al. 2001 Astrophys. J. 551, L147

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