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Draft:List of most massive black holes

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This NASA animation shows a size comparison of the supermassive black holes each with an accretion disc.

This is a list of the most massive black holes so far discovered (and probable candidates), ordered by mass. The unit of measurement used is the mass of the Sun (approximately 1.99×1030 kilograms).

Overview

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Comparisons of large and small black holes in galaxy OJ 287 to the Solar System. Supermassive black holes, including the former, are the most massive and largest known type of black holes.

A supermassive black hole (SMBH) is an extremely large black hole, on the order of 100,000 to billions of solar masses (M☉), and is theorized to exist in the center of almost all massive galaxies. In some galaxies, there are even binary systems of supermassive black holes, see the OJ 287 system. Unambiguous dynamical evidence for SMBHs exists only in a handful of galaxies;[1] these include the Milky Way, the Local Group galaxies M31 and M32, and a few galaxies beyond the Local Group, e.g. NGC 4395. In these galaxies, the mean square (or root mean square) velocities of the stars or gas rises as ~1/r near the center, indicating a central point mass. In all other galaxies observed to date, the rms velocities are flat, or even falling, toward the center, making it impossible to state with certainty that a supermassive black hole is present.[1] Nevertheless, it is commonly accepted that the center of nearly every galaxy contains a supermassive black hole.[2] The reason for this assumption is the M–sigma relation, a tight (low scatter) relation between the mass of the hole in the ~10 galaxies with secure detections, and the velocity dispersion of the stars in the bulges of those galaxies.[3] This correlation, although based on just a handful of galaxies, suggests to many astronomers a strong connection between the formation of the black hole and the galaxy itself.[2] Supermassive boson star

Caveats

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There is extreme difficulty in determining the mass of a particular SMBH, and so they still remain in the field of open research. SMBHs with accurate masses are limited only to galaxies within the Laniakea Supercluster and to active galactic nuclei. Another problem for this list is the method used in determining the mass. Such methods, such as broad emission-line reverberation mapping (BLRM), Doppler measurements, velocity dispersion, and the aforementioned M–sigma relation have not yet been well established. Most of the time, the masses derived from the given methods contradict each other's values.

Although SMBHs are currently theorized to exist in almost all massive galaxies, more massive black holes above 5 billion M☉, dubbed as 'ultramassive' ('UMBHs'), are rare; with only a handful of these black holes having been discovered to date.

This is the maximum mass of a black hole that models predict, at least for luminous accreting SMBH's. Given the age of the universe and the composition of available matter, there is simply not enough time to grow black holes larger than this mass.[4] At around 1×1010 M☉, both effects of intense radiation and star formation in the accretion disc slows down black hole growth.[4][5][6][7] New discoveries suggest that many black holes, dubbed 'stupendously large' ('SLABs'), may exceed 100 billion M☉ or even 1 trillion M☉, and would have been seeded by primordial black holes.[8]

Comparison of the shadow (black) and important surfaces (white) of a black hole, including the event horizon. The spin parameter a is animated, while the left side of the black hole is rotating towards the observer who is assumed to be far away.

Radius

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Per the no-hair theorem, the radius of a black hole depends directly on three quantities: the mass, angular momentum, and electric charge. The Schwarzschild radius is a characteristic radius proportional to the mass of an object that corresponds to the radius defining the surface for a Schwarzschild black hole (static, non-rotating and uncharged), in which any object whose radius is smaller than its Schwarzschild radius become a black hole. The surface at the radius acts as the event horizon of the black hole. Rotating or charged black holes (Kerr, Reissner–Nordström, Kerr–Newman) have two event horizons; the outer horizon is referred to the event horizon and the inner horizon is referred to the cauchy horizon. The more the black hole spins and/or has a higher electric charge, the smaller the event horizon is until close to twice smaller than the Schwarszchild radius. Surpassing the upper limit given for the spin parameter or the electric charge would cause two merged event horizons to shrink toward the singularity, resulting a naked singularity obeservable from the outside universe. This is expected theoretically they are unlikely to exist; however, there are potential exceptions such as B3 1715+425, which is believed to be a nearly naked rotating black hole.

Due to their extreme amount of gravity, light rays passing near extremely compact objects likes black holes or "ultracompact" neutron stars are deflected by their strong gravitational field that they can bend their path and magnify background images. This would leave a shadow (often encircled by a bright light ring), which is a boundary 1.5 times the Schwarzschild radius of the object where light can no longer orbit the object multiple times without being eventually captured. As such, the object would appear larger than its surface radius.[9]

For more context regarding radii of black holes depending on their masses, spin parameters, and presence of electric charges, see section Black hole#Properties and structure.

List

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This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by adding missing items with reliable sources.
Legend
Existence disputed
Likely candidates

This list contains supermassive black holes with masses 5 billion M☉ (5×109 M☉) or above, determined at least to the order of magnitude. Note that this list is very far from complete, as the Sloan Digital Sky Survey (SDSS) alone detected 200,000 quasars, which likely may be the homes of billion-solar-mass black holes. Due to the very large numbers involved, listed black holes here have their mass values in scientific notation (numbers multiplied to powers of 10). Values with uncertainties are written in parentheses when possible. Note that different entries in this list have different methods and systematics in obtaining their mass values, and hence different levels of confidence in their masses. These methods are specified in their notes.

The radii of the event horzion of all black holes included within the list are based on both the mass and dimensionless spin parameter. Electric charge parameters are excluded from the list as it has been expected that the universe appear to be electrically balanced (or nearly so), thus it is likely that no black hole with a significant electric charge can naturally exist. Any black hole that does not have any measured spin paramater in the list is assumed as non-rotating, hence listed with the Schwarzschild radius based on its measured mass.

Supermassive black holes with masses higher than 5 billion M☉
Host or black hole name/designation Mass
(in solar mass) 		Spin parameter Event horizon radius
(in solar radius) 		Mass estimation method[a] Notes
PKS 1508+059 9.77+18.4
−6.22×1010[10][11] 		~ 415,000 Rb
The above masses are larger than what is predicted by current models of black hole growth, and thus some, if not all, of these mass estimates might be potentially unreliable
(Theoretical limit) 5×1010[4] ~ 212,000 Reported for reference
TON 618 4.07×1010[12] 0.6 156,000 C IV
Holmberg 15A (4.0±0.8)×1010[13] ~ 170,000 Specified obtained through orbit-based, axisymmetric Schwarzschild models; the mass very poorly known as its estimates varies widely between 2.1×109 and up to 3.1×1011 M☉.
SDSS 143148.09+053558 3.64×1010[12] ~ 155,000
NGC 4874 3.47+6.05
−2.24×1010[10][11] 		~ 147,000 Rb
SMSS J215728.21-360215.1 (3.4±0.6)×1010[14] ~ 144,000 Mg II
SDSS J102325.31+514251.0 3.31+0.67
−0.56×1010[15] 		~ 141,000 Mg II
Abell 1201 BCG (3.27±2.12)×1010[16] ~ 139,000 MBH−σe Estimated using strong gravitational lensing from a distant galaxy 1.3 arcseconds separated from the nucleus of the BCG. Beware of ambiguity between the BH mass determination and the galaxy cluster's dark matter profile.[17]
NGC 6166 2.84+0.27
−0.18×1010[18] 		~ 203,000 Rb Central galaxy of Abell 2199; notable for its hundred thousand light year long relativistic jet.
ESO 383-76 (Abell 3571 BCG) 2.75+4.83
−1.75×1010[10][11] 		~ 147,000 Rb
2MASS J13260399+7023462 (2.7±0.4)×1010[19] ~ 115,000 FWHM & CIV & ML
ESO 444-46 (Abell 3558-M1) 2.69+4.72
−1.71×1010[10][11] 		~ 115,000 Rb Brightest cluster galaxy of Abell 3558 in the center of the Shapley Supercluster; estimated using .
UGC 10143 (Abell 2147 BCG) 2.63+4.61
−1.68×1010[10][11] 		~ 147,000 Rb
NGC 4889 2.00+1.65
−1.52×1010[10] 		~ 0.00
SDSS J074521.78+734336.1 (1.95±0.05)×1010[15] ~ 0.00 Mg II
OJ 287 (primary) (1.8348±0.0008)×1010[20] 0.381±0.004[21] 75,000 A smaller 100 million M☉ black hole orbits this one in a 12-year period. But this measurement is in question[by whom?] due to the limited number and precision of observed companion orbits.
SBS 1425+606 1.82×1010[12] ~ 156,000
NGC 1600 1.70+0.16
−0.15×1010[10][22][23] 		~ 0.00 Unprecedentedly massive in relation of its location: an elliptical galaxy host in a sparse environment.
4C 71.07 1.62+0.24
−0.21×1010[24] 		~ 0.00
QSO B2126-158 (1.51–4.90)×1010[24] ~ 0.00
SDSS J08019.69+373047.3 (1.51±0.31)×1010[15] ~ 0.00 Mg II
SDSS J115954.33+201921.1 (1.41±0.10)×1010[15] ~ 0.00 Mg II
ESO 139-12 1.38+0.40
−0.49×1010[24] 		~ 0.00
SDSS J075303.34+423130.8 (1.38±0.03)×1010[15] ~ 0.00 Hβ
SDSS J080430.56+542041.1 (1.35±0.22)×1010[15] ~ 0.00 Mg II
SDSS J144542.75+49024 1.27×1010[12] ~ 156,000
Phoenix A ~1.26×1010[25], 1.8×1010[26] or ≥1×1011[27] ~ 425,000 Cm & cS[27] Higher value consistent with evolutionary modelling of gas accretion and the dynamics and density profiles of the galaxy.[27] Mass has not been measured directly.
SDSS J0100+2802 (1.24±0.19)×1010[28][29] ~ 0.00 Mg II
SDSS J010619.24+00482 1.23×1010[12] ~ 156,000
UGC 579 (Abell 119 BCG) 1.20+1.96
−0.75×1010[10][11] 		~ 147,000 Rb
SDSS J081855.77+095848.0 (1.20±0.06)×1010[15] ~ 0.00 Mg II
NGC 1270 1.2×1010[30] ~ 0.00 Elliptical galaxy located in the Perseus Cluster. Also is a low-luminosity AGN (LLAGN).[31]
SDSS J134743.29+49562 1.14×1010[12] ~ 156,000
ESO 444-72 (Abell 3562 BCG) 1.12+1.83
−0.70×1010[10][11] 		~ 147,000 Rb
SDSS J082535.19+512706.3 (1.12±0.20)×1010[15] ~ 0.00 Hβ
SDSS J101336.37+56153 1.12×1010[12] ~ 156,000
S5 0014+81 (1.1–1.38)×1010[32] 0.9–0.9982[32] 0.00 Once thought
SDSS J013127.34-032100.1 (1.1±0.2)×1010[33] ~ 0.00 ADSM[33]
6C 021252+733537 1.0+2.72
−0.86×1010[24] 		~ 0.00
APM 08279+5255 1.0+0.17
−0.13×1010[34] 		≤0.7[35] 36,400 RM & Si IV & C IV[34]
PSO J334.2028+01.4075 1×1010[36] ~ 0.00 There are actually two black holes, orbiting at each other in a close pair with a 542-day period. The largest one is quoted, while the smaller one's mass is not defined.[36]
PGC 1900245 1×1010[37] ~ 0.00
NGC 1281 1×1010[38] ~ 0.00 Compact elliptical galaxy in the Perseus Cluster. Mass estimates range from 10 billion M☉ down to <5 billion M☉.[39]
SDSS J015741.57-010629.6 (9.8±1.4)×109[15] ~ 0.00
SDSS 143645.80+633637 9.31×109[12] ~ 156,000
NGC 3842 9.12+3.5
−2.5×109[citation needed] 		~ 0.00 Brightest galaxy in the Leo Cluster
SDSS J230301.45-093930.7 (9.12±0.88)×109[15] ~ 0.00 Mg II
4C 11.69 8.91+14.53
−6.96×109[24] 		~ 0.00
SDSS 113829.33+040101 8.65×109[12] ~ 156,000
QSO B2149-306 8.32+23.3
−7.67×109[24] 		~ 0.00
SDSS J140821.67+025733.2 8×109[40] 0.97[21] 21,100 Mg II
SDSS J075303.33+42313 7.85×109[12] ~ 156,000
SDSS 081227.19+075732 7.85×109[12] ~ 156,000
SDSS J075819.70+202300.9 (7.8±3.9)×109[15] ~ 0.00 Hβ
6C 001403+811827 7.41+118.48
−6.97×109[24] 		~ 0.00
SDSS J083700.82+35055 7.38×109[12] ~ 156,000
SDSS J143835.95+43145 7.33×109[12] ~ 156,000
NGC 5419 7.24+2.74
−1.91×109[41] 		~ 0.00 cS Estimated from the stellar velocity distribution. A secondary satellite SMBH may orbit around 70 parsecs.[41]
SDSS J083946.22+51120 7.13×109[12] ~ 156,000
SWIFT J1948.4-7975 6.92+3.08
−1.91×109[24] 		~ 0.00
CID-947 6.9+0.8
−1.2×109[42] 		~ 0.00 Hβ Constitutes 10% of the total mass of its host galaxy.
SDSS J163636.92+31571 6.79×109[12] ~ 156,000
LEDA 214543 6.76+7.36
−3.52×109[43] 		~ 156,000
CGCG 367-009 6.61+7.20
−3.44×109[43] 		~ 156,000
SDSS 123442.16+052126 6.55×109[12] ~ 156,000
SDSS J080956.02+502000.9 (6.46±0.45)×109[15] ~ 0.00 Hβ
SDSS 081331.28+254503 6.34×109[12] ~ 156,000
UGC 12282 6.31+7.82
−3.49×109[43] 		~ 156,000
NGC 4686 6.31+6.28
−3.15×109[43] 		~ 156,000
SDSS J014214.75+002324.2 (6.31±1.16)×109[15] ~ 0.00 Mg II
SDSS J014049.18-08394 6.27×109[12] ~ 156,000
SDSS J145408.95+51144 6.17×109[12] ~ 156,000
SDSS 204536.56-010147 6.15×109[12] ~ 156,000
SDSS J150620.48+46064 6.14×109[12] ~ 156,000
SDSS J105756.28+45555 6.04×109[12] ~ 156,000
Hercules A (3C 348) 5.9+0.42
−0.39×109[44] 		~ 25,000 Notable for its million light-year long relativistic jet. Another estimate gives 1.519×1010 M☉.[45]
SDSS 135439.70+301649 5.78×109[12] ~ 156,000
PG 1425+267 5.46×109[12] ~ 156,000
Abell 2261 BCG[b] (5.37–64.6)×109[10][11] ~ 274,000 Rb
Messier 87 (NGC 4486) 5.37+0.37
−0.25×109[47] 		0.90±0.05[48] 19,800 Central galaxy of the Virgo Cluster; the first black hole directly imaged.
SDSS J025905.63+001121.9 (5.25±0.73)×109[15] ~ 22,300 Hβ
QSO B2005+40 (5.13–9.55)×109[24] ~ 0.00
SDSS J094202.04+042244.5 (5.13±0.71)×109[15] ~ 21,800 Hβ
SDSS J162520.31+22583 5.01×109[12] ~ 156,000
QSO B0746+254 5×109[49] ~ 0.00

Listed below are some notable black holes under five billion solar masses, for the purpose of comparison.

Notable supermassive black holes with mass less than 5 billion M☉
Host or black hole name/designation Mass
(in solar mass) 		Spin parameter Event horizon radius
(in solar radius) 		Mass estimation method Notes
H1821+643 3.89×109[43][50] 0.62+0.22
−0.37[51][52] 		6,060
Cygnus A (2.5±0.7)×109[53] ~ 0.00 Brightest extrasolar radio source in the sky as seen at frequencies above 1 GHz.
Q0906+6930 2×109[54] ~ 0.00 Most distant blazar, at z = 5.47
QSO J0313–1806 (1.6±0.4)×109[55] ~ 0.00
NGC 1277 1.2+0.4
−0.3×109[56] 		~ 0.00 Once thought to harbor a black hole so large that it contradicted modern galaxy formation and evolutionary theories,[57] re-analysis of the data revised it downward to roughly a third of the original estimate.[58] and then one tenth.[56]
ULAS J1342+0928 9.1+1.3
−1.4×108[59] 		~ 0.00 One of most distant quasars at z=7.54[60]
NGC 3115 8.8+10.0
−2.7×108[61]		 ~ 0.00
Sombrero Galaxy (6.4±0.4)×109[61] ~ 0.00 Bolometrically most luminous galaxy in the local universe.
NGC 4261 (5±1)×108[61] ~ 0.00 Notable for its 88,000 ly long relativistic jet.[62]
NGC 1399 (4.7±0.6)×108[61] ~ 0.00 Central galaxy of the Fornax Cluster
4C +74.13 (4.07–513)×108[10][11] 0.9[63] 156,000 Rb Break radius of 0.5 kpc core of the central galaxy.[10][11] Produced a colossal AGN outburst after accreting 600 million M☉ worth of material. Previous indirect assumptions about the efficiencies of gas accretion and jet power yield a lower limit of 1 billion M☉.[64][65][66]
Messier 59 (3.9±0.4)×108[61] ~ 0.00 This black hole has a retrograde rotation.[67]
3C 273 (2.6±1.1)×108[68] ~ 0.00 Brightest quasar in the sky
Messier 82 (Cigar Galaxy) (1.6–10)×108[69] ~ 0.00 Prototype starburst galaxy.[70]
NGC 7727 1.54+0.18
−0.15×108[71]		 ~ 0.00 With 6.3×106 M☉ companion and the closest confirmed BBH to Earth.
Andromeda Galaxy 1.4+0.65
−0.45×108[72][73] 		0.44[74] 564 S/G Nearest large galaxy to the Milky Way; the black hole is localed in P2 in 2C 56, the core of the galaxy.
Centaurus A (6.63±4.89)×107[75] ~ 0.00 Also notable for its million light-year long relativistic jet.[76]
NGC 5548 5×107[77] ~ 0.00
UHZ1 4×107[77] ~ 0.00 Lbol First detected candidate for an overmassive (or outsize) black hole galaxy (OBG), a class of transient and high-redshift objects that are heavy initial direct collapse black hole seeds that likely formed from gas clouds or supermassive stars.
M60-UCD1 2.1+1.4
−0.7×107[78]		 ~ 0.00 Constitutes 15% of the mass of its host galaxy.
RX J1242.6−1119A 5.3×106[79] ~ 0.00 Observed by the Chandra X-ray Observatory to be tidally disrupting a star.[80][81]
Milky Way (Sagittarius A*) 4.0+1.1
−0.6×106[82] 		0.94[83] 11.4 The black hole at the center of the Milky Way; the second black hole directly imaged.
Messier 32 (2.4±1.0)×106 ~ 11.4 A dwarf satellite galaxy of the Andromeda Galaxy (see above).
SDSS J160135.95+311353.7 1×105[84] ~ 11.4

See also

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Notes

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  1. ^ Methods for calculating the radius:
  2. ^ This galaxy has not been found to contain an active SMBH of at least 1010 M☉, implying that either the central black hole is accreting at a low level or has a much smaller mass rather below 1010 M☉.[46]

References

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