Redshift of light emitted by particles orbiting a black hole immersed in a strong magnetic field

López, L. A.; Bretón, Nora

doi:10.1007/s10509-021-03961-3

Cited by 10 publications

(2 citation statements)

References 23 publications

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“…This gain of energy results in an increase in the frequency of the ongoing photon, consequently its wavelength decreases, and the phenomenon is famed as gravitational blue-shift. The phenomenon of gravitational red blue shifts of photons moving in ISCO around BH is a genuine cause of attraction for physicists [128][129][130][131][132].…”

Section: Introductionmentioning

confidence: 99%

Testing the Metric-Affine Gravity Using Particle Dynamics and Photon Motion

Ditta¹,

Xia²,

Mumtaz³

et al. 2023

Preprint

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This work mainly focuses to unveil the optical features of a black hole. For this objective, we utilize the metric-affine black hole geometry with the inclusion of dilation, spin, and shear charge. The Lagrangian coefficients f1 and d1 are the main parameters, where f1 < 0, which differentiate the solutions by d1 = 8f1, d1 = −8f1, & d1 = ±8f1. Based on these parameters, we carry out this work in two cases, i.e., d1 = 8f1, & d1 = −8f1. We forecast the detailed impact of dilation, spin, and shear charges on the optical properties of black hole in both cases. To unreveal the optical features, we calculate horizon radius, inner stable circular orbit, photon sphere radius, BH shadows, quasi-periodic oscillations, the red-blue shift of photon particles, effective force, weak gravitational lensing, and image magnification by using metric-affine gravity black hole geometry.

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Section: Introductionmentioning

confidence: 99%

Testing the Metric-Affine Gravity Using Particle Dynamics and Photon Motion

Ditta¹,

Xia²,

Mumtaz³

et al. 2023

Preprint

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“…In [16], the authors calculated frequency shifts of photons emitted from geodesics of black holes with nonlinear electrodynamics, especially, the Bardeen and Bronnikov black holes and the Born-Infeld and Dymnikova black holes. Further, the study of the redshift of light emitted by particles orbiting a black hole immersed in a strong magnetic field was performed in [17]. Redshift data could be essential to study the features of motion of objects such as individual stars and compact gas clouds as well as compact binary stars around black holes as discussed in [18,19].…”

Section: Introduction and Brief Overview Of The Formalismmentioning

confidence: 99%

Mass and spin of Kerr black holes in terms of observational quantities: The dragging effect on the redshift

Banerjee,

Herrera-Aguilar,

Momennia

et al. 2022

Preprint

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In this work, we elaborate on the development of a general relativistic formalism that allows one to analytically express the mass and spin parameters of the Kerr black hole in terms of observational data: the total redshift and blueshift of photons emitted by geodesic massive particles revolving the black hole and their orbital parameters. Thus, we present concise closed formulas for the mass and spin parameters of the Kerr black hole in terms of few directly observed quantities in the case of equatorial circular orbits either when the black hole is static or is moving with respect to a distant observer. Furthermore, we incorporate the gravitational dragging effect generated by the rotating nature of the Kerr black hole into the analysis and elucidate its non-trivial contribution to the expression for the light bending parameter and the frequency shifts of photons emitted by orbiting particles that renders simple symmetric expressions for the kinematic redshift and blueshift. We also incorporate the dependency of the frequency shift on the azimuthal angle, a fact that allows one to express the total redshift/blueshift along any point of the orbit of the revolving particle for the cases when the black hole is both static or moving with respect to us. These formulas allow one to compute the Kerr black hole parameters by applying this general relativistic formalism to astrophysical systems like the megamaser accretion disks orbiting supermassive black holes at the core of active galactic nuclei. Our results open a new window to implement parameter estimation studies to constrain black hole variables, and they can be generalized to black hole solutions beyond Einstein gravity.

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