Photon regions, shadow observables, and constraints from M87* of a charged rotating black hole

Meng, Yu; Kuang, Xiao-Mei; Tang, Zi-Yu

doi:10.1103/physrevd.106.064006

Cited by 30 publications

(3 citation statements)

References 73 publications

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“…Research in BH imaging and the optical appearence of BHs has recently become a thriving field, with many studies on how the EHT data can constrain hairy BHs, e.g. [73][74][75][76][77][78][79][80][81][82][83][84][85][86] as well as many other academic works on the shadows and lensing by "hairy" spinning (asymptotically flat) BHs -see e.g. for some recent studies [87][88][89][90][91][92][93][94][95][96][97][98][99][100][101][102][103][104][105] and also the reviews [62,106].…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Kerr black holes with synchronised Proca hair: lensing, shadows and EHT constraints

Sengo

Cunha

Herdeiro

et al. 2023

J. Cosmol. Astropart. Phys.

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We investigate the gravitational lensing by spinning Proca stars and the shadows and lensing by Kerr black holes (BHs) with synchronised Proca hair, discussing both theoretical aspects and observational constraints from the Event Horizon Telescope (EHT) M87* and Sgr A* data. On the theoretical side, this family of BHs interpolates between Kerr-like solutions — exhibiting a similar optical appearance to that of Kerr BHs — to very non-Kerr like solutions, exhibiting exotic features such as cuspy shadows, egg-like shadows and ghost shadows. We interpret these features in terms of the structure of the fundamental photon orbits, for which different branches exist, containing both stable and unstable orbits, with some of the latter not being shadow related. On the observational side, we show that current EHT constraints are compatible with all such BHs that could form from the growth of the superradiant instability of Kerr BHs. Unexpectedly, given the (roughly) 10% error bars in the EHT data — and in contrast to their scalar cousin model —, some of the BHs with up to 40% of their energy in their Proca hair are compatible with the current data. We estimate the necessary resolution of future observations to better constrain this model.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Kerr black holes with synchronised Proca hair: lensing, shadows and EHT constraints

Sengo

Cunha

Herdeiro

et al. 2023

J. Cosmol. Astropart. Phys.

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show abstract

“…The most relevant comparisons are those of Kocherlakota et al (2021), the Event Horizon Telescope Collaboration et al (2022b), andVagnozzi et al (2023), which directly infer limits on a number of the alternative spacetimes we consider here. In addition, limits that incorporate potential shape characterizations have appeared in the literature (see, e.g., Meng et al 2022Meng et al , 2023Sui et al 2023), though currently, EHT-derived limits on the departure from circularity remain dominated by systematic uncertainties (Tiede et al 2022a(Tiede et al , 2022b.…”

Section: Observational Implicationsmentioning

confidence: 99%

Photon Rings and Shadow Size for General Axisymmetric and Stationary Integrable Spacetimes

Salehi,

Broderick,

Georgiev

2024

ApJ

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There are now multiple direct probes of the region near black hole horizons, including direct imaging with the Event Horizon Telescope (EHT). As a result, it is now of considerable interest to identify what aspects of the underlying spacetime are constrained by these observations. For this purpose, we present a new formulation of an existing broad class of integrable, axisymmetric, stationary spinning black hole spacetimes, specified by four free radial functions, that makes manifest which functions are responsible for setting the location and morphology of the event horizon and ergosphere. We explore the size of the black hole shadow and higher-order photon rings for polar observers, approximately appropriate for the EHT observations of M87*, finding analogous expressions to those for general spherical spacetimes. Of particular interest, we find that these are independent of the properties of the ergosphere, but do directly probe the free function that defines the event horizon. Based on those expressions, we extend the nonperturbative, nonparametric characterization of the gravitational implications of various near-horizon measurements to spinning spacetimes. Finally, we demonstrate this characterization for a handful of explicit alternative spacetimes.

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“…Laor proposed a formulation for calculating line profiles emitted from accretion disks around rotating black holes, highlighting the preponderance of a flux emanating from the disk's inner realm and manifesting as a blue shift in the line peak [17]. The depiction of accretion disks in various modified gravity contexts of black holes has prompted extensive scholarly inquiries [18][19][20][21][22]. Delving into Rastall's theoretical framework to understand black holes enriches the comprehension of this alternative gravitational paradigm.…”

Section: Introductionmentioning

confidence: 99%

Rastall gravity: accretion disk image in the context of radiation fields and visual transformations compared to Reissner-Nordström black hole*

Huang 黄,

Guo 郭,

Liang 梁

et al. 2024

Chinese Phys. C

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Our study investigates the astronomical implications of Rastall gravity, particularly its behavior amidst a radiation field compared to Reissner-Nordstr"{o}m (RN) black holes. Our research delineates a crucial correlation between the dynamics of the accretion disk and the parameters Q and N_{\rm r}, which aptly reflect the influence of spacetime metrics on the disk's appearance. Elevated electric charge Q prompts contraction in the disk’s orbit due to enhanced gravitational effects, while higher N_{\rm r} values lead to outward expansion, influenced by the radiation field's attributes. Interestingly, the charged black holes surrounded by radiation fields display distinct visual disparities from RN black holes. Brightness decreases and expansion occurs within the accretion disk's innermost stable circular orbit with rising N_{\rm r} values. Our study also reveals the process by which the accretion disk transitions from a conventional disk-like structure to a hat-like form at different observation angles, with the redshift effect gradually intensifying. Moreover, the results of the Rastall gravity radiation field we consider are consistent with the constraints of the host galaxy's gravitational lensing on the Rastall gravity parameters, enhancing the consistency between theoretical predictions and actual observations.

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Photon regions, shadow observables, and constraints from M87* of a charged rotating black hole

Cited by 30 publications

References 73 publications

Kerr black holes with synchronised Proca hair: lensing, shadows and EHT constraints

Kerr black holes with synchronised Proca hair: lensing, shadows and EHT constraints

Photon Rings and Shadow Size for General Axisymmetric and Stationary Integrable Spacetimes

Rastall gravity: accretion disk image in the context of radiation fields and visual transformations compared to Reissner-Nordström black hole*

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