Image of a regular phantom compact object and its luminosity under spherical accretions

Abstract

We have studied the shadow and its luminosity for a static and regular phantom compact object under the static spherical accretion and the infalling spherical accretion, respectively. Comparing with the usual Schwarzschild black hole, the presence of phantom hair yields the larger black hole shadow and the darker image. In both spherical accretion models, with the increase of phantom parameter, the maximum luminosity occurred at photon ring and the brightness of the central region in the shadow decrease, but in the region far from the shadow, the luminosity of image slightly increases. The image of a phantom wormhole and its luminosity have similar behaviors. Moreover, as the phantom charge parameter $\alpha$ increases up to the critical value at where the compact object changes from black hole to wormhole, there exists a jump for the specific intensity, which also appears in the slowly rotating case. This implies that the phantom hair is imprinted on both the shadow radius and the intensity of the electromagnetic flux radiation around compacted object.

arXiv comment19 pages, 13 figures. Accepted for publication in class. Quantum Grav

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• Charged black-bounce spacetimes: Photon rings, shadows and observational appearances
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• Chaotic photon orbits and shadows of a non-Kerr object described by the Hartle-Thorne spacetime
• Determination of the spin parameter and the inclination angle by the relativistic images in black hole image
• Distinguishing black holes with and without spontaneous scalarization in Einstein-scalar-Gauss-Bonnet theories via optical features
• The ring-shaped shadow of rotating naked singularity with a complete photon sphere
• Particle dynamics and optical appearance of charged spherically symmetric black holes in bumblebee gravity
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