Photon Ring and Observational Appearance of a Hairy Black Hole
| Autor: | Peng Wang, Houwen Wu, Haitang Yang, Qingyu Gan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Brightness Photon Astrophysics::High Energy Astrophysical Phenomena Bent molecular geometry FOS: Physical sciences Astrophysics General Relativity and Quantum Cosmology (gr-qc) Ray General Relativity and Quantum Cosmology Luminosity Black hole Annulus (firestop) Schwarzschild metric Astrophysics::Galaxy Astrophysics |
| Popis: | Recently, the image of a Schwarzschild black hole with an accretion disk has been revisited, and it showed that the "photon ring", defined as highly bent light rays that intersect the disk plane more than twice, is extremely narrow and makes a negligible contribution to the total brightness. In this paper, we investigate the observational appearance of an optically and geometrically thin accretion disk around a hairy black hole in an Einstein-Maxwell-scalar model. Intriguingly, we find that in a certain parameter regime, due to an extra maximum or an "ankle-like" structure in the effective potential for photons, the photon ring can be remarkably wide, thus making a notable contribution to the flux of the observed image. In particular, there appears a wide and bright annulus, which comprises multiple concentric bright thin rings with different luminosity, in the high resolution image. v1:18pages, 8 figures; v2: 18pages, 8 figures, references added |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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