Rings and images of Horndeski hairy black hole illuminated by various thin accretions

Wang, Xijing; Kuang, Xiao-Mei; Ye, Meng; Wang, Bin; Wu, Jian-Pin

doi:10.1103/physrevd.107.124052

Cited by 24 publications

(8 citation statements)

References 97 publications

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“…The spacetime described by the spherically symmetric Horndeski metric (2.1) is asymptotically flat and degenerates to the classical Schwarzschild case when the scalar hair is absent (h → 0). Interestingly, by examining the variation of the lapse function (2.3) with radius r, previous studies have confirmed that the event horizon r + of the hairy BH is located at 2M when the scalar hair parameter satisfies the condition h ≥ −2 [28,65,[70][71][72].…”

Section: Jcap04(2024)089 2 Tilted Stable Circular Orbits Of Massive P...mentioning

confidence: 95%

“…Meanwhile, further revealing the observational appearance of these BHs is of great significance for future observations. Recently, Wang et al studied the variations of the photon sphere and the BH shadow with the Horndeski hairy parameter [28]. The results showed that the photon sphere and shadow radii are monotonically decreasing functions of the hair parameter.…”

Section: Jcap04(2024)089mentioning

confidence: 99%

“…In Boyer-Lindquist coordinates x µ = (t, r, θ, φ), the static spherically symmetric BH with scalar hair in Horndeski gravity can be found in [28,65,[68][69][70] as…”

Section: Jcap04(2024)089 2 Tilted Stable Circular Orbits Of Massive P...mentioning

confidence: 99%

“…In particular, when the emission region of the accretion disk extends down to the event horizon, the BH shadow is confined to a small region, with a JCAP04(2024)089 clear separation between its boundary and the critical curve, which represents the asymptotic image of the photon ring. This investigation provided new insights into the interpretation of BH photos and triggered a flood of work regarding the influences of thin accretion disks on BH images [22][23][24][25][26][27][28][29][30][31]. However, it is worth noting that all of these works restricted the accretion disk to the equatorial plane.…”

Section: Introductionmentioning

confidence: 99%

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Influences of tilted thin accretion disks on the observational appearance of hairy black holes in Horndeski gravity

Hu,

Li,

Deng

et al. 2024

J. Cosmol. Astropart. Phys.

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Research on the observational appearance of black holes, both in general relativity and modified gravity, has been in full swing since the Event Horizon Telescope Collaboration announced photos of M87* and Sagittarius A*. Nevertheless, limited attention has been given to the impact of tilted accretion disks on black hole images. This paper investigates the 230 GHz images of non-rotating hairy black holes illuminated by tilted, thin accretion disks in Horndeski gravity with the aid of a ray tracing method. The results indicate that reducing the scalar hair parameter effectively diminishes image luminosity and extends both the critical curve and the inner shadow. This trend facilitates the differentiation between hairy black holes and Schwarzschild black holes, especially in certain parameter spaces where the current Event Horizon Telescope array is capable of capturing such variations. Furthermore, we observe that the inclination of the tilted accretion disk can mimic the observation angle, consequently affecting image brightness and the morphology of the inner shadow. In specific parameter spaces, alterations in the tilt or position of the accretion disk can lead to a drift in the light spot within the images of hairy black holes. This finding may establish a potential correlation between the precession of the tilted accretion disk and image features. Additionally, through an examination of images depicting hairy black holes surrounded by two thin accretion disks, we report the obscuring effect of the accretion environment on the inner shadow of the black hole.

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Section: Jcap04(2024)089 2 Tilted Stable Circular Orbits Of Massive P...mentioning

confidence: 95%

Section: Jcap04(2024)089mentioning

confidence: 99%

“…In Boyer-Lindquist coordinates x µ = (t, r, θ, φ), the static spherically symmetric BH with scalar hair in Horndeski gravity can be found in [28,65,[68][69][70] as…”

Section: Jcap04(2024)089 2 Tilted Stable Circular Orbits Of Massive P...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influences of tilted thin accretion disks on the observational appearance of hairy black holes in Horndeski gravity

Hu,

Li,

Deng

et al. 2024

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

“…In the field of theoretical research, many previous studies mainly focus on the gravitational lensing effect stemming from spacetime geometry, where the light sources are modeled to be of simple structures and often as geometrically thin disks [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. However, for a low-luminosity active galactic nuclei (LLAGN) like the M87*, the horizon-scale accretion flow is mostly geometrically thick [2,34].…”

Section: Introductionmentioning

confidence: 99%

Imaging thick accretion disks and jets surrounding black holes

Zhang,

Hou,

Guo

et al. 2024

J. Cosmol. Astropart. Phys.

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Based on the horizon-scale magnetofluid model developed in [1], we investigate the millimeter-wave images of a geometrically thick accretion disk or a funnel wall, i.e., the magnetofluid that encloses the base of the jet region, around a Kerr black hole. By employing the numerical method to solve the null geodesic and radiative transfer equations, we obtain the optical appearances at various observational angles and frequencies, generated by the thermal synchrotron radiation within the magnetofluid. For the thick disk, we specifically examine the impact of emission anisotropy on images, concluding that anisotropic synchrotron radiation could play an important role in the observability of the photon ring. For the funnel wall, we find that both the outflow and inflow funnel walls exhibit annular structures on the imaging plane. The outflow funnel wall yields a brighter primary image than the photon ring, whereas the inflow one does not. Based on our investigation, the inflow funnel wall model can not be ruled out by current observations of M87*.

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Thin accretion disk images of rotating hairy Horndeski black holes

Heydari-Fard,

Riazi

2024

Astrophys Space Sci

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Rings and images of Horndeski hairy black hole illuminated by various thin accretions

Cited by 24 publications

References 97 publications

Influences of tilted thin accretion disks on the observational appearance of hairy black holes in Horndeski gravity

Influences of tilted thin accretion disks on the observational appearance of hairy black holes in Horndeski gravity

Imaging thick accretion disks and jets surrounding black holes

Thin accretion disk images of rotating hairy Horndeski black holes

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