 Artist's representation of M33 X-7 | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Triangulum |
| Right ascension | 01h 33m 34.13s[1] |
| Declination | +30° 32′ 11.3″[1] |
| Apparent magnitude (V) | +18.70[1] |
| Characteristics | |
| Spectral type | O7-8III / Black hole[2] |
| Astrometry | |
| Distance | 2700000±70000 ly (840000±20000[2] pc) |
| Orbit[2] | |
| Period (P) | 3.45301 ± 0.00002 d |
| Semi-major axis (a) | 42.4 ± 1.5 R☉ |
| Eccentricity (e) | 0.0185 ± 0.0077 |
| Inclination (i) | 74.6 ± 1.0° |
| Details[2] | |
| O-type star | |
| Mass | 70 ± 6.9 M☉ |
| Temperature | 35000 ± 1000 K |
| Black hole | |
| Mass | 15.65 ± 1.45 M☉ |
| Radius | 0.000066 ± 0.0000061 R☉ |
| Other designations | |
2E 408, 2E 0130.7+3016, RX J0133.5+3032, CXOU J013334.1+303210 | |
| Database references | |
| SIMBAD | data |
M33 X-7 is a black hole binary system in the Triangulum Galaxy. The system is made up of a stellar-mass black hole and a companion star. The black hole in M33 X-7 has an estimated mass of 15.65 times that of the Sun (M☉)[3][4] (formerly the largest known stellar black hole, though this has now been superseded amongst electromagnetically-observed black holes by an increased mass estimate for Cygnus X-1,[5] and also by many of the LVK-detected binary black hole components[6]). The total mass of the system is estimated to be around 85.7 M☉, which would make it the most massive black hole binary system. The black hole is consuming its partner, a 70 solar mass blue giant star.
- ^ a b c "M33 X-7". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 4 December 2016.
- ^ a b c d Valsecchi, Francesca; Glebbeek, Evert; Farr, Will M.; Fragos, Tassos; Willems, Bart; Orosz, Jerome A.; Liu, Jifeng; Kalogera, Vassiliki; Kologera, Vicky; Van Der Sluys, Marc (2010). The Intriguing Evolutionary History of the Massive Black Hole X-ray Binary M33 X-7 (PDF). International Conference on Binaries: In Celebration of Ron Webbink's 65Th Birthday. AIP Conference Proceedings. Vol. 1314. pp. 285–290. arXiv:1010.4742. Bibcode:2010AIPC.1314..285V. doi:10.1063/1.3536386. S2CID 119301068.
- ^ "NASA - Heaviest Stellar Black Hole Discovered in Nearby Galaxy".
- ^ Valsecchi, Francesca; Glebbeek, Evert; Farr, Will M.; Fragos, Tassos; Willems, Bart; Orosz, Jerome A.; Liu, Jifeng; Kalogera, Vassiliki (2010). "Formation of the black-hole binary M33 X-7 through mass exchange in a tight massive system". Nature. 468 (7320): 77–79. arXiv:1010.4809. Bibcode:2010Natur.468...77V. doi:10.1038/nature09463. PMID 20962778. S2CID 4353636.
- ^ Miller-Jones, James C. A.; Bahramian, Arash; Orosz, Jerome A.; Mandel, Ilya; Gou, Lijun; Maccarone, Thomas J.; Neijssel, Coenraad J.; Zhao, Xueshan; Ziółkowski, Janusz; Reid, Mark J.; Uttley, Phil (2021-03-01). "Cygnus X-1 contains a 21-solar mass black hole—Implications for massive star winds". Science. 371 (6533): 1046–1049. arXiv:2102.09091. Bibcode:2021Sci...371.1046M. doi:10.1126/science.abb3363. ISSN 0036-8075. PMID 33602863. S2CID 231951746.
- ^ The LIGO Scientific Collaboration; the Virgo Collaboration; the KAGRA Collaboration; Abbott, R.; Abbott, T. D.; Acernese, F.; Ackley, K.; Adams, C.; Adhikari, N.; Adhikari, R. X.; Adya, V. B. (2023). "GWTC-3: Compact Binary Coalescences Observed by LIGO and Virgo during the Second Part of the Third Observing Run". Physical Review X. 13 (4): 041039. arXiv:2111.03606. Bibcode:2023PhRvX..13d1039A. doi:10.1103/PhysRevX.13.041039.