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Gravitational_Lensing.gifGravitational Lensing115 visiteLensing by a Black Hole. This is an animated simulation of a phenomenon known as "Gravitational Lensing" and as caused by a Schwarzschild-type Black Hole moving in front of a background Galaxy. A secondary image of the Galaxy can be seen within the so-called "Einstein's Ring" of the Black Hole, on the opposite direction of the one of the Galaxy. The secondary image grows (still remaining within the Einstein's Ring) as the primary image approaches the Black Hole. The surface brightness of the two images remain constant, but their angular size varies, hence producing an amplification of the Galaxy Luminosity as seen from a distant observer. The maximum amplification occurs when the background Galaxy (or, like in the present case, a bright part of it) is exactly behind the Black Hole.MareKromium
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