Tolman–Oppenheimer–Volkoff limit

The Tolman–Oppenheimer–Volkoff limit (or TOV limit) is an upper bound to the mass of cold, non-rotating neutron stars, analogous to the Chandrasekhar limit for white dwarf stars. If the mass of a neutron star reaches the limit it will collapse to a denser form, most likely a black hole.

Theoretical work in 1996 placed the limit at approximately 1.5 to 3.0 solar masses,[1] corresponding to an original stellar mass of 15 to 20 solar masses; additional work in the same year gave a more precise range of 2.2 to 2.9 solar masses.[2]

Observations of GW170817, the first gravitational wave event due to merging neutron stars (which are thought to have collapsed into a black hole[3] within a few seconds after merging[4]), placed the limit in the range of 2.01 to 2.17 M☉ (solar masses).[5]

In the case of a rigidly spinning neutron star,[n 1] the mass limit is thought to increase by up to 18–20%.[4][5]

History

The idea that there should be an absolute upper limit for the mass of a cold (as distinct from thermal pressure supported) self-gravitating body dates back to the 1932 work of Lev Landau, based on the Pauli exclusion principle. Pauli's principle shows that the fermionic particles in sufficiently compressed matter would be forced into energy states so high that their rest mass contribution would become negligible when compared with the relativistic kinetic contribution (RKC). RKC is determined just by the relevant quantum wavelength λ, which would be of the order of the mean interparticle separation. In terms of Planck units, with the reduced Planck constant ħ, the speed of light c, and the gravitational constant G all set equal to one, there will be a corresponding pressure given roughly by

.

At the upper mass limit, that pressure will equal the pressure needed to resist gravity. The pressure to resist gravity for a body of mass M will be given according to the virial theorem roughly by

,

where ρ is the density. This will be given by ρ = m/λ3, where m is the relevant mass per particle. It can be seen that the wavelength cancels out so that one obtains an approximate mass limit formula of the very simple form

.

In this relationship, m can be taken to be given roughly by the proton mass. This even applies in the white dwarf case (that of the Chandrasekhar limit) for which the fermionic particles providing the pressure are electrons. This is because the mass density is provided by the nuclei in which the neutrons are at most about as numerous as the protons. Likewise the protons, for charge neutrality, must be exactly as numerous as the electrons outside.

In the case of neutron stars this limit was first worked out by J. Robert Oppenheimer and George Volkoff in 1939, using the work of Richard Chace Tolman. Oppenheimer and Volkoff assumed that the neutrons in a neutron star formed a degenerate cold Fermi gas. They thereby obtained a limiting mass of approximately 0.7 solar masses,[6][7] which was less than the Chandrasekhar limit for white dwarfs. Taking account of the strong nuclear repulsion forces between neutrons, modern work leads to considerably higher estimates, in the range from approximately 1.5 to 3.0 solar masses.[1] The uncertainty in the value reflects the fact that the equations of state for extremely dense matter are not well known.

Applications

In a neutron star less massive than the limit, the weight of the star is balanced by short-range repulsive neutron–neutron interactions mediated by the strong force and also by the quantum degeneracy pressure of neutrons, preventing collapse. If its mass is above the limit, the star will collapse to some denser form. It could form a black hole, or change composition and be supported in some other way (for example, by quark degeneracy pressure if it becomes a quark star). Because the properties of hypothetical, more exotic forms of degenerate matter are even more poorly known than those of neutron-degenerate matter, most astrophysicists assume, in the absence of evidence to the contrary, that a neutron star above the limit collapses directly into a black hole.

A black hole formed by the collapse of an individual star must have mass exceeding the Tolman–Oppenheimer–Volkoff limit. Theory predicts that because of mass loss during stellar evolution, a black hole formed from an isolated star of solar metallicity can have a mass of no more than approximately 10 solar masses.[8]:Fig. 16 Observationally, because of their large mass, relative faintness, and X-ray spectra, a number of massive objects in X-ray binaries are thought to be stellar black holes. These black hole candidates are estimated to have masses between 3 and 20 solar masses.[9][10] LIGO has detected black hole mergers involving black holes in the 7.5–50 solar mass range; it is possible – although unlikely – that these black holes were themselves the result of previous mergers.

List of the most massive neutron stars

Below is a list of neutron stars. These include rotating neutron stars and thus are not directly related to the TOV Limit.

Name Mass
(M☉)		 Distance
(ly)		 Companion class Mass determination method Notes Refs.
PSR J1748−2021B2.74±0.2127,700DRate of advance of periastron.In globular cluster NGC 6440.[11]
4U 1700-372.44±0.276,910 ± 1,120O6.5Iaf+Monte Carlo simulations of thermal comptonization process.HMXB system.[12][13]
PSR J0952–0607 2.35±0.17 3,200-5,700 Fastest and heaviest known galactic neutron star [14]
PSR J1311–34302.15–2.76,500–12,700Substellar objectSpectroscopic and photometric observation.Black widow pulsar.[15][16]
PSR J1600−30532.3+0.7
−0.6		6,500 ± 1,000DFourier analysis of Shapiro delay's orthometric ratio.[17][18]
PSR J2215+51352.27+0.17
−0.15		10,000G5VInnovative measurement of companion's radial velocity.Redback pulsar.[19]
XMMU J013236.7+3032282.2+0.8
−0.6		2,730,000B1.5IVDetailed spectroscopic modelling.In M33, HMXB system.[20]
PSR J0751+18072.10±0.26,500 ± 1,300DPrecision pulse timing measurements of relativistic orbital decay.[21]
PSR J0740+66202.08±0.074,600DRange and shape parameter of Shapiro delay.Most massive neutron star with a well-constrained mass[22][23][24]
PSR J0348+04322.01±0.042,100DSpectroscopic observation and orbital decay due to radiation of gravitational waves.[17][25]
PSR B1516+02B1.94+0.17
−0.19		24,500DRate of advance of periastron.In globular cluster M5.[17][26]
PSR J1614−22301.908±0.0163,900DRange and shape parameter of Shapiro delay.In Milky Way's galactic disk.[17][18][27]
Vela X-11.88±0.136,200 ± 650B0.5IbRate of advance of periastron.Prototypical detached HMXB system.[28]
PSR B1957+201.81±0.176,500Substellar objectRate of advance of periastron.Prototype star of black widow pulsars.[29][30][31]

List of least massive black holes
See also: Stellar black hole

Below is a list of black holes.

Name Mass
(M☉)		 Distance
(ly)		 Companion class Mass determination method Notes Refs.
V723 Monocerotis3.04±0.061,500K0/K1IIISpectroscopic radial velocity measurements of companion.Mass may be underestimated due not accurate measurement distance to the companion star.[32]
2MASS J05215658+43592203.3+2.8
−0.7		10,000K-type (?) giantSpectroscopic radial velocity measurements of noninteracting companion.In Milky Way outskirts.[17][33][34]
GW190425's remnant3.4+0.3
−0.1		518,600,000N/AGravitational wave data of neutron star merger from LIGO and Virgo interferometers.97% chance of prompt collapse into a black hole immediately after merger.[17][35][36]
NGC 3201-14.36±0.4115,600(see Notes)Spectroscopic radial velocity measurements of noninteracting companion.In globular cluster NGC 3201. Companion is 0.8M☉ main sequence turn-off.[17][37]
HR 6819 (QV Tel)5.0±0.41,120Be/B3IIISpectroscopic radial velocity measurements of companion.Unconfirmed black hole.[38]
GRO J1719-24/
GRS 1716−249		≥4.98,500K0-5 VNear-infrared photometry of companion and Eddington flux.LMXB system.[17][39]
4U 1543-475.0+2.5
−2.3		30,000 ± 3,500A2 (V?)Spectroscopic radial velocity measurements of companion.SXT system.[17][40]
XTE J1650-500≥5.18,500 ± 2,300K4VOrbital resonance modeling from QPOsTransient binary X-ray source[41]
GRO J1655-405.31±0.07<5,500F6IVPrecision X-ray timing observations from RossiXTE.LMXB system.[42][43]
GX 339-45.9±3.626,000N/A[17]

List of objects in mass gap

This list contains objects that may be neutron stars, black holes, quark stars, or other exotic objects. This list is distinct from the list of least massive black holes due to the undetermined nature of these objects, largely because of indeterminate mass, or other poor observation data.

Name Mass
(M☉)		 Distance
(ly)		 Companion class Mass determination method Notes Refs.
GW170817's remnant2.74+0.04
−0.01		144,000,000N/AGravitational wave data of neutron star merger from LIGO and Virgo interferometers.In NGC 4993. Possibly collapsed into a black hole 5–10 seconds after merger.[44]
SS 433 3.0–30.0 18,000 ± 700A7IbFirst discovered microquasar system. Confirmed to have a magnetic field, which is atypical for a black hole; however, it could be the field of the accretion disk, not of the compact object.[45] [46][47]
LB-1 2.0–70.0 approx. 7,000Be star/stripped helium starInitially thought to be first black hole in pair-instability mass gap.[48][49]
Cygnus X-3 2.0–5.0 24,100 ± 3,600WN4-6Near-infrared spectroscopy and atmosphere model fitting of companion.Microquasar system. Major differences between the spectrum of Cyg X-3 and typical accreting BH can be explained by properties of its companion star.[50][51]
LS I +61 3031.0 - 4.07,000B0VeSpectroscopic radial velocity measurements of companion.Microquasar system. It has a spectrum typical for black holes, however it emits HE and VHE gamma rays similar to neutron stars LS_2883 and HESS J0632+057, as well as mysterious object LS 5039.[52][53]
LS 50393.7+1.3
−1.0		8,200 ± 300O(f)N6.5VIntermediate-dispersion spectroscopy and atmosphere model fitting of companion.Microquasar system. Only lowest possible mass allows it not to be a black hole.[54]
GRO J0422+32/V518 Persei3.97+0.95
−1.87		8,500M4.5VPhotometric light curve modelling.SXT system. Only mass close to lowest possible allows it not to be a black hole.[17][55]

See also

Notes
  1. Meaning that different levels in the interior of the star all rotate at the same rate.

References
  1. Bombaci, I. (1996). "The Maximum Mass of a Neutron Star". Astronomy and Astrophysics. 305: 871–877. Bibcode:1996A&A...305..871B.
  2. Kalogera, V; Baym, G (11 August 1996). "The Maximum Mass of a Neutron Star". The Astrophysical Journal. 470: L61–L64. arXiv:astro-ph/9608059v1. Bibcode:1996ApJ...470L..61K. doi:10.1086/310296. S2CID 119085893.
  3. Pooley, D.; Kumar, P.; Wheeler, J. C.; Grossan, B. (2018-05-31). "GW170817 Most Likely Made a Black Hole". The Astrophysical Journal. 859 (2): L23. arXiv:1712.03240. Bibcode:2018ApJ...859L..23P. doi:10.3847/2041-8213/aac3d6. S2CID 53379493.
  4. Cho, A. (16 February 2018). "A weight limit emerges for neutron stars". Science. 359 (6377): 724–725. Bibcode:2018Sci...359..724C. doi:10.1126/science.359.6377.724. PMID 29449468.
  5. Rezzolla, L.; Most, E. R.; Weih, L. R. (2018-01-09). "Using Gravitational-wave Observations and Quasi-universal Relations to Constrain the Maximum Mass of Neutron Stars". Astrophysical Journal. 852 (2): L25. arXiv:1711.00314. Bibcode:2018ApJ...852L..25R. doi:10.3847/2041-8213/aaa401. S2CID 119359694.
  6. Tolman, R. C. (1939). "Static Solutions of Einstein's Field Equations for Spheres of Fluid". Physical Review. 55 (4): 364–373. Bibcode:1939PhRv...55..364T. doi:10.1103/PhysRev.55.364.
  7. Oppenheimer, J. R.; Volkoff, G. M. (1939). "On Massive Neutron Cores". Physical Review. 55 (4): 374–381. Bibcode:1939PhRv...55..374O. doi:10.1103/PhysRev.55.374.
  8. Woosley, S. E.; Heger, A.; Weaver, T. A. (2002). "The Evolution and Explosion of Massive Stars". Reviews of Modern Physics. 74 (4): 1015–1071. Bibcode:2002RvMP...74.1015W. doi:10.1103/RevModPhys.74.1015. S2CID 55932331.
  9. McClintock, J. E.; Remillard, R. A. (2003). "Black Hole Binaries". arXiv:astro-ph/0306213.
  10. Casares, J. (2006). "Observational Evidence for Stellar-Mass Black Holes". Proceedings of the International Astronomical Union. 2: 3. arXiv:astro-ph/0612312. doi:10.1017/S1743921307004590. S2CID 119474341.
  11. Lattimer, James M. (2015-02-25). "Introduction to Neutron Stars". AIP Conference Proceedings. 1645 (1): 61–78. Bibcode:2015AIPC.1645...61L. doi:10.1063/1.4909560.
  12. Clark, J. S.; Goodwin, S. P.; Crowther, P. A.; Kaper, L.; Fairbairn, M.; Langer, N.; Brocksopp, C. (2002). "Physical parameters of the high-mass X-ray binary 4U1700-37". Astronomy & Astrophysics. 392 (3): 909–920. arXiv:astro-ph/0207334. Bibcode:2002A&A...392..909C. doi:10.1051/0004-6361:20021184. S2CID 119552560.
  13. Martinez-Chicharro, M.; Torrej ́on, J. M.; Oskinova, L.; F ̈urst, F.; Postnov, K.; Rodes-Roca, J. J.; Hainich, R.; Bodaghee, A. (2018). "Evidence of Compton cooling during an X-ray flare supports a neutron star nature of the compact object in 4U1700−37". Monthly Notices of the Royal Astronomical Society: Letters. 473 (1): L74–L78. arXiv:1710.01907. Bibcode:2018MNRAS.473L..74M. doi:10.1093/mnrasl/slx165. S2CID 56539478.
  14. Romani, Roger W.; Kandel, D.; Filippenko, Alexei V.; Brink, Thomas G.; Zheng, WeiKang (2022-08-01). "PSR J0952−0607: The Fastest and Heaviest Known Galactic Neutron Star". The Astrophysical Journal Letters. 934 (2): L17. arXiv:2207.05124. Bibcode:2022ApJ...934L..17R. doi:10.3847/2041-8213/ac8007. ISSN 2041-8205. S2CID 250451299.
  15. Romani, Roger W.; Filippenko, Alexei V.; Silverman, Jeffery M.; Cenko, S. Bradley; Greiner, Jochen; Rau, Arne; Elliott, Jonathan; Pletsch, Holger J. (2012-10-25). "PSR J1311-3430: A Heavyweight Neutron Star with a Flyweight Helium Companion". The Astrophysical Journal Letters. 760 (2): L36. arXiv:1210.6884. Bibcode:2012ApJ...760L..36R. doi:10.1088/2041-8205/760/2/L36. S2CID 56207483.
  16. Romani, Roger W. (2012-10-01). "2FGL J1311.7−3429 Joins the Black Widow club". The Astrophysical Journal Letters. 754 (2): L25. arXiv:1207.1736. Bibcode:2012ApJ...754L..25R. doi:10.1088/2041-8205/754/2/L25. S2CID 119262868.
  17. Elavsky, F; Geller, A. "Masses in the Stellar Graveyard". Northwestern University.
  18. Arzoumanian, Zaven; Brazier, Adam; Burke-Spolaor, Sarah; Chamberlin, Sydney; Chatterjee, Shami; Christy, Brian; Cordes, James M.; Cornish, Neil J.; Crawford, Fronefield; Cromartie, H. Thankful (2018). "The NANOGrav 11-year Data Set: High-precision Timing of 45 Millisecond Pulsars". The Astrophysical Journal Supplement Series. 235 (2): 37. arXiv:1801.01837. Bibcode:2018ApJS..235...37A. doi:10.3847/1538-4365/aab5b0. hdl:1959.3/443169. S2CID 13739724.
  19. Linares, M.; Shahbaz, T.; Casares, J.; Grossan, Bruce (2018). "Peering into the Dark Side: Magnesium Lines Establish a Massive Neutron Star in PSR J2215+5135". The Astrophysical Journal. 859 (1): 54. arXiv:1805.08799. Bibcode:2018ApJ...859...54L. doi:10.3847/1538-4357/aabde6. S2CID 73601673.
  20. Bhalerao, Varun B.; Van Kerkwijk, Marten H.; Harrison, Fiona A. (2012). "Constraints on the Compact Object Mass in the Eclipsing High-mass X-Ray Binary XMMU J013236.7+303228 in M 33". The Astrophysical Journal. 757 (1): 10. arXiv:1207.0008. Bibcode:2012ApJ...757...10B. doi:10.1088/0004-637X/757/1/10. S2CID 29852395.
  21. Nice, David J.; Splaver, Eric M.; Stairs, Ingrid H.; Loehmer, Oliver; Jessner, Axel; Kramer, Michael; Cordes, James M. (2005). "A 2.1 Solar Mass Pulsar Measured by Relativistic Orbital Decay". The Astrophysical Journal. 634 (2): 1242–1249. arXiv:astro-ph/0508050. Bibcode:2005ApJ...634.1242N. doi:10.1086/497109. S2CID 16597533.
  22. Fonseca, E.; Cromartie, H. T.; Pennucci, T. T.; Ray, P. S.; Kirichenko, A. Yu; Ransom, S. M.; Demorest, P. B.; Stairs, I. H.; Arzoumanian, Z.; Guillemot, L.; Parthasarathy, A. (1 July 2021). "Refined Mass and Geometric Measurements of the High-mass PSR J0740+6620". The Astrophysical Journal Letters. 915 (1): L12. arXiv:2104.00880. Bibcode:2021ApJ...915L..12F. doi:10.3847/2041-8213/ac03b8. ISSN 2041-8205. S2CID 233004363.
  23. Kohler, Susanna (16 August 2021). "Reweighing a Heavy Neutron Star". Retrieved 2021-08-20.
  24. Cromartie, H. T.; Fonseca, E.; Ransom, S. M.; et al. (2019). "Relativistic Shapiro delay measurements of an extremely massive millisecond pulsar". Nature Astronomy. 4: 72–76. arXiv:1904.06759. Bibcode:2020NatAs...4...72C. doi:10.1038/s41550-019-0880-2. S2CID 118647384.
  25. Demorest, P. B.; Pennucci, T.; Ransom, S. M.; Roberts, M. S. E.; Hessels, J. W. T. (2010). "A two-solar-mass neutron star measured using Shapiro delay". Nature. 467 (7319): 1081–1083. arXiv:1010.5788. Bibcode:2010Natur.467.1081D. doi:10.1038/nature09466. PMID 20981094. S2CID 205222609.
  26. Freire, Paulo C. C. (2008). "Super-Massive Neutron Stars". AIP Conference Proceedings. 983: 459–463. arXiv:0712.0024. Bibcode:2008AIPC..983..459F. doi:10.1063/1.2900274. S2CID 18565598.
  27. Crawford, F.; Roberts, M. S. E.; Hessels, J. W. T.; Ransom, S. M.; Livingstone, M.; Tam, C. R.; Kaspi, V. M. (2006). "A Survey of 56 Midlatitude EGRET Error Boxes for Radio Pulsars". The Astrophysical Journal. 652 (2): 1499–1507. arXiv:astro-ph/0608225. Bibcode:2006ApJ...652.1499C. doi:10.1086/508403. S2CID 522064.
  28. Quaintrell, H.; et al. (2003). "The mass of the neutron star in Vela X-1 and tidally induced non-radial oscillations in GP Vel". Astronomy and Astrophysics. 401: 313–324. arXiv:astro-ph/0301243. Bibcode:2003A&A...401..313Q. doi:10.1051/0004-6361:20030120. S2CID 5602110.
  29. Van Kerkwijk, M. H.; Breton, R. P.; Kulkarni, S. R. (2011). "Evidence for a Massive Neutron Star from a Radial-Velocity Study of the Companion to the Black-Widow Pulsar Psr B1957+20". The Astrophysical Journal. 728 (2): 95. arXiv:1009.5427. Bibcode:2011ApJ...728...95V. doi:10.1088/0004-637X/728/2/95. S2CID 37759376.
  30. Clark, C. J.; Kerr, M.; Barr, E. D.; Bhattacharyya, B.; Breton, R. P.; Bruel, P.; Camilo, F.; Chen, W.; Cognard, I.; Cromartie, H. T.; Deneva, J.; Dhillon, V. S.; Guillemot, L.; Kennedy, M. R.; Kramer, M. (2023-01-26). "Neutron star mass estimates from gamma-ray eclipses in spider millisecond pulsar binaries". Nature Astronomy. 7 (4): 451–462. arXiv:2301.10995. Bibcode:2023NatAs...7..451C. doi:10.1038/s41550-022-01874-x. ISSN 2397-3366. PMC 10119022. PMID 37096051. S2CID 256274563.
  31. "Gamma-ray eclipses shed new light on spider pulsars". www.aei.mpg.de. Retrieved 2023-01-27.
  32. Jayasinghe, T.; Stanek, K. Z.; Thompson, Todd A.; Kochanek, C. S.; Rowan, D. M.; Vallely, P. J.; Strassmeier, K. G.; Weber, M.; Hinkle, J. T.; Hambsch, F-J; Martin, D. V.; Prieto, J. L.; Pessi, T.; Huber, D.; Auchettl, K.; Lopez, L. A.; Ilyin, I.; Badenes, C.; Howard, A. W.; Isaacson, H.; Murphy, S. J. (2021). "A unicorn in monoceros: The 3 M⊙ dark companion to the bright, nearby red giant V723 Mon is a non-interacting, mass-gap black hole candidate". Monthly Notices of the Royal Astronomical Society. 504 (2): 2577–2602. arXiv:2101.02212. Bibcode:2021MNRAS.504.2577J. doi:10.1093/mnras/stab907.
  33. Thompson, T. A.; Kochanek, C. S.; Stanek, K. Z.; et al. (2019). "A noninteracting low-mass black hole–giant star binary system". Science. 366 (6465): 637–640. arXiv:1806.02751. Bibcode:2019Sci...366..637T. doi:10.1126/science.aau4005. PMID 31672898. S2CID 207815062.
  34. Kumar, V. (2019-11-03). "Astronomers Spot A New Class Of Low-Mass Black Holes". RankRed. Retrieved 2019-11-05.
  35. Abbott, B. P.; et al. (2020). "GW190425: Observation of a Compact Binary Coalescence with Total Mass ~ 3.4 M ⊙". The Astrophysical Journal. 892 (1): L3. arXiv:2001.01761. Bibcode:2020ApJ...892L...3A. doi:10.3847/2041-8213/ab75f5. S2CID 210023687.
  36. Foley, Ryan J.; Coulter, David A.; Kilpatrick, Charles D.; Piro, Anthony L.; Ramirez-Ruiz, Enrico; Schwab, Josiah (2020). "Updated parameter estimates for GW190425 using astrophysical arguments and implications for the electromagnetic counterpart". Monthly Notices of the Royal Astronomical Society. 494 (1): 190–198. arXiv:2002.00956. Bibcode:2020MNRAS.494..190F. doi:10.1093/mnras/staa725.
  37. Giesers, B; et al. (2018). "A detached stellar-mass black hole candidate in the globular cluster NGC 3201". Monthly Notices of the Royal Astronomical Society: Letters. 475 (1): L15–L19. arXiv:1801.05642. Bibcode:2018MNRAS.475L..15G. doi:10.1093/mnrasl/slx203. S2CID 35600251.
  38. Michelle Starr (2020-10-20). "The Closest Black Hole to Earth May Not Actually Be a Black Hole After All". Retrieved 2020-12-20.
  39. Chaty, S.; Mirabel, I. F.; Goldoni, P.; Mereghetti, S.; Duc, P.-A.; Martí, J.; Mignani, R. P. (2002). "Near-infrared observations of Galactic black hole candidates". Monthly Notices of the Royal Astronomical Society. 331 (4): 1065–1071. arXiv:astro-ph/0112329. Bibcode:2002MNRAS.331.1065C. doi:10.1046/j.1365-8711.2002.05267.x. S2CID 15529877.
  40. Orosz, Jerome A.; Jain, Raj K.; Bailyn, Charles D.; McClintock, Jeffrey E.; Remillard, Ronald A. (2002). "Orbital Parameters for the Soft X-Ray Transient 4U 1543-47: Evidence for a Black Hole". The Astrophysical Journal. 499 (1): 375–384. arXiv:astro-ph/9712018. Bibcode:1998ApJ...499..375O. doi:10.1086/305620. S2CID 16991861.
  41. Slany, P.; Stuchlik, Z. (1 October 2008). "Mass estimate of the XTE J1650-500 black hole from the Extended Orbital Resonance Model for high-frequency QPOs". Astronomy & Astrophysics. 492 (2): 319–322. arXiv:0810.0237. Bibcode:2008A&A...492..319S. doi:10.1051/0004-6361:200810334. S2CID 5526948.
  42. Motta, S. E.; Belloni, T. M.; Stella, L.; Muñoz-Darias, T.; Fender, R. (2014). "Precise mass and spin measurements for a stellar-mass black hole through X-ray timing: The case of GRO J1655-40". Monthly Notices of the Royal Astronomical Society. 437 (3): 2554. arXiv:1309.3652. Bibcode:2014MNRAS.437.2554M. doi:10.1093/mnras/stt2068.
  43. Foellmi, C.; Depagne, E.; Dall, T.H.; Mirabel, I.F (12 June 2006). "On the distance of GRO J1655-40". Astronomy & Astrophysics. 457 (1): 249–255. arXiv:astro-ph/0606269. Bibcode:2006A&A...457..249F. doi:10.1051/0004-6361:20054686. S2CID 119395985.
  44. van Putten, Maurice H P M; Della Valle, Massimo (January 2019). "Observational evidence for extended emission to GW 170817". Monthly Notices of the Royal Astronomical Society: Letters. 482 (1): L46–L49. arXiv:1806.02165. Bibcode:2019MNRAS.482L..46V. doi:10.1093/mnrasl/sly166. we report on a possible detection of extended emission (EE) in gravitational radiation during GRB170817A: a descending chirp with characteristic time-scale τs = 3.01±0.2 s in a (H1,L1)-spectrogram up to 700 Hz with Gaussian equivalent level of confidence greater than 3.3 σ based on causality alone following edge detection applied to (H1,L1)-spectrograms merged by frequency coincidences. Additional confidence derives from the strength of this EE. The observed frequencies below 1 kHz indicate a hypermassive magnetar rather than a black hole, spinning down by magnetic winds and interactions with dynamical mass ejecta.
  45. Cherepashchuk, Anatol (2002). "Observational Manifestations of Precession of Accretion Disk in the SS 433 Binary System". Space Science Reviews. 102 (1): 23–35. Bibcode:2002SSRv..102...23C. doi:10.1023/A:1021356630889. S2CID 115604949.
  46. Abeysekara, A. U.; Albert, A.; Alfaro, R.; Alvarez, C.; Álvarez, J. D.; Arceo, R.; Arteaga-Velázquez, J. C.; Avila Rojas, D.; Ayala Solares, H. A.; Belmont-Moreno, E.; Benzvi, S. Y.; Brisbois, C.; Caballero-Mora, K. S.; Capistrán, T.; Carramiñana, A.; Casanova, S.; Castillo, M.; Cotti, U.; Cotzomi, J.; Coutiño De León, S.; De León, C.; de la Fuente, E.; Díaz-Vélez, J. C.; Dichiara, S.; Dingus, B. L.; Duvernois, M. A.; Ellsworth, R. W.; Engel, K.; Espinoza, C.; et al. (2018). "Very-high-energy particle acceleration powered by the jets of the microquasar SS 433". Nature. 562 (7725): 82–85. arXiv:1810.01892. Bibcode:2018Natur.562...82A. doi:10.1038/s41586-018-0565-5. PMID 30283106. S2CID 52918329.
  47. Staff Writers (2018-10-04). "Scientists discover new nursery for superpowered photons". Space Daily.
  48. Liu, Jifeng; et al. (27 November 2019). "A wide star–black-hole binary system from radial-velocity measurements". Nature. 575 (7784): 618–621. arXiv:1911.11989. Bibcode:2019Natur.575..618L. doi:10.1038/s41586-019-1766-2. PMID 31776491. S2CID 208310287.
  49. Irrgang, A.; Geier, S.; Kreuzer, S.; Pelisoli, I.; Heber, U. (January 2020). "A stripped helium star in the potential black hole binary LB-1". Astronomy and Astrophysics (Letter to the Editor). 633: L5. arXiv:1912.08338. Bibcode:2020A&A...633L...5I. doi:10.1051/0004-6361/201937343.
  50. Koljonen, K. I. I.; MacCarone, T. J. (2017). "Gemini/GNIRS infrared spectroscopy of the Wolf-Rayet stellar wind in Cygnus X-3". Monthly Notices of the Royal Astronomical Society. 472 (2): 2181. arXiv:1708.04050. Bibcode:2017MNRAS.472.2181K. doi:10.1093/mnras/stx2106. S2CID 54028568.
  51. Zdziarski, A. A.; Mikolajewska, J.; Belczynski, K. (2013). "Cyg X-3: A low-mass black hole or a neutron star". Monthly Notices of the Royal Astronomical Society. 429: L104–L108. arXiv:1208.5455. Bibcode:2013MNRAS.429L.104Z. doi:10.1093/mnrasl/sls035. S2CID 119185839.
  52. Massi, M; Migliari, S; Chernyakova, M (2017). "The black hole candidate LS I +61°0303". Monthly Notices of the Royal Astronomical Society. 468 (3): 3689. arXiv:1704.01335. Bibcode:2017MNRAS.468.3689M. doi:10.1093/mnras/stx778. S2CID 118894005.
  53. Albert, J; et al. (2006). "Variable Very-High-Energy Gamma-Ray Emission from the Microquasar LS I +61 303". Science. 312 (5781): 1771–3. arXiv:astro-ph/0605549. Bibcode:2006Sci...312.1771A. doi:10.1126/science.1128177. PMID 16709745. S2CID 20981239.
  54. Casares, J; Ribo, M; Ribas, I; Paredes, J. M; Marti, J; Herrero, A (2005). "A possible black hole in the γ-ray microquasar LS 5039". Monthly Notices of the Royal Astronomical Society. 364 (3): 899–908. arXiv:astro-ph/0507549. Bibcode:2005MNRAS.364..899C. doi:10.1111/j.1365-2966.2005.09617.x. S2CID 8393701.
  55. Gelino, D. M.; Harrison, T. E. (2003). "GRO J0422+32: The Lowest Mass Black Hole?". The Astrophysical Journal. 599 (2): 1254–1259. arXiv:astro-ph/0308490. Bibcode:2003ApJ...599.1254G. doi:10.1086/379311. S2CID 17785067.
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