A 15.65-solar-mass black hole in an eclipsing binary in the nearby spiral galaxy M 33

摘要: It's important to try work out the weight — or more properly mass of a distant stellar object because it plays such large part in determining its behaviour. Black holes are particular interest, but not easy targets. The usual way weighing black hole is determine gravitational pull on nearby object, and that has now been achieved for recently discovered binary system M 33 X-7, galaxy Messier 33. At 15.7 solar masses, most massive 'stellar-mass' known. Its companion star one known stars, at around 70 X-7 16 times than any other confirmed hole. Models evolution have difficulty producing close binaries with masses ten sun, which consistent fact so far all within standard deviation that. This paper report 15.65 ±1.45 sun located Stellar-mass found X-ray-emitting systems, where their can be determined from dynamics stars1,2,3. Sun (>10 ; ref. 4), far2,3 10 . Here we (15.65 ± 1.45) (M 33) only an eclipsing binary5. To produce hole, progenitor must retained much outer envelope until after helium fusion core was completed4. On hand, order present 3.45-day orbit about (70.0 ± 6.9) companion, there ‘common envelope’ phase significant amount lost system6. We find common could occurred unless during magnitude less what usually assumed evolutionary models stars7,8,9.