Photon ring and observational appearance of a hairy black hole
نویسندگان
چکیده
Recently, the image of a Schwarzschild black hole with an accretion disk has been revisited, and it showed that ``photon ring,'' defined as highly bent light rays intersect plane more than twice, is extremely narrow makes negligible contribution to total brightness. In this paper, we investigate observational appearance optically geometrically thin around hairy in Einstein-Maxwell-scalar model. Intriguingly, find certain parameter regime, due extra maximum or ``anklelike'' structure effective potential for photons, photon ring can be remarkably wide, thus making notable flux observed image. particular, there appears wide bright annulus, which comprises multiple concentric rings different luminosity, high resolution
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ژورنال
عنوان ژورنال: Physical review
سال: 2021
ISSN: ['0556-2813', '1538-4497', '1089-490X']
DOI: https://doi.org/10.1103/physrevd.104.044049