M87 black hole mass and spin estimate through the position of the jet boundary shape break

Nokhrina, E. E.; Gurvits, L. I.; Бескин, В. С.; Nakamura, Masanori; Asada, Keiichi; Hada, Kazuhiro

doi:10.1093/mnras/stz2116

Cited by 45 publications

(41 citation statements)

References 70 publications

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“…Such low spin values are compatible with some estimates of the M87 BH spin, say, j ∼ 0.1 in Ref. [54]. Imposing M M87 =λ ≳ 0.353, yields the (weak) constraint λ ≲ 1.8 × 10 10 M ⊙ .…”

supporting

confidence: 88%

Spontaneously Scalarized Kerr Black Holes in Extended Scalar-Tensor–Gauss-Bonnet Gravity

2019

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We construct asymptotically flat, spinning, regular on and outside an event horizon, scalarized black holes (SBHs) in extended scalar-tensor-Gauss-Bonnet models. They reduce to Kerr BHs when the scalar field vanishes. For an illustrative choice of nonminimal coupling, we scan the domain of existence. For each value of spin, SBHs exist in an interval between two critical masses, with the lowest one vanishing in the static limit. Non-uniqueness with Kerr BHs of equal global charges is observed; the SBHs are entropically favoured. This suggests that SBHs form dynamically from the spontaneous scalarization of Kerr BHs, which are prone to a scalar-triggered tachyonic instability, below the largest critical mass. Phenomenologically, the introduction of BH spin damps the maximal observable difference between comparable scalarized and vacuum BHs. In the static limit, (perturbatively stable) SBHs can store over 20% of the spacetime energy outside the event horizon; in comparison with Schwarzschild BHs, their geodesic frequency at the ISCO can differ by a factor of 2.5 and deviations in the shadow areal radius may top 40%. As the BH spin grows, low mass SBHs are excluded, and the maximal relative differences decrease, becoming of the order of a few percent for dimensionless spin j ≳ 0.5. This reveals a spin selection effect: non-GR effects are only significant for low spin. We discuss if and how the recently measured shadow size of the M87 supermassive BH constrains the length scale of the Gauss-Bonnet coupling.

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confidence: 88%

Spontaneously Scalarized Kerr Black Holes in Extended Scalar-Tensor–Gauss-Bonnet Gravity

2019

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“…The 1σ error in this fit corresponds to the observed width of the asymmetric bright ring on the M87* image[1][2][3][4][5][6]. The derived value of the M87* spin is in a general agreement with the other similar estimations[44][45][46][47][48][49][50][51][52]. See inFigure 6the superposition of the M87* image and the modelled image of the thin accretion disk in the case of a = 0.75.FIG.…”

supporting

confidence: 73%

The Brightest Point in Accretion Disk and Black Hole Spin: Implication to the Image of Black Hole M87*

Dokuchaev

Nazarova

2019

Universe

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We propose the simple new method for extracting the value of the black hole spin from the direct high-resolution image of black hole by using a thin accretion disk model. In this model the observed dark region on the first image of the supermassive black hole in the galaxy M87, obtained by the Event Horizon Telescope, is a silhouette of the black hole event horizon. The outline of this silhouette is the equator of the event horizon sphere. The dark silhouette of the black hole event horizon is placed within the expected position of the black hole shadow, which is not revealed on the first image. We calculated numerically the relation between the observed position of the black hole silhouette and the brightest point in the thin accretion disk, depending on the black hole spin. From this relation we derive the spin of the supermassive black hole M87*, a = 0.75 ± 0.15.

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“…By applying this relation for interpretation of the black hole image, obtained by the Event Horizon Telescope, we find that the thin accretion disk model is conformed with the presented black hole image of the supermassive black hole M87* at the spin value a = 0.75 ± 0.15, with the 1σ statistical error [263]. This value of the supermassive black hole M87* spin is in a general agreement with the others corresponding estimations by different methods [267][268][269][270][271][272][273][274][275].…”

Section: Spin Of Black Hole M87*supporting

confidence: 87%

Silhouettes of invisible black holes

Dokuchaev

Nazarova

2020

Успехи физических наук

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M87 black hole mass and spin estimate through the position of the jet boundary shape break

Cited by 45 publications

References 70 publications

Spontaneously Scalarized Kerr Black Holes in Extended Scalar-Tensor–Gauss-Bonnet Gravity

Spontaneously Scalarized Kerr Black Holes in Extended Scalar-Tensor–Gauss-Bonnet Gravity

The Brightest Point in Accretion Disk and Black Hole Spin: Implication to the Image of Black Hole M87*

Silhouettes of invisible black holes

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