Shadows of multi-black holes: Analytic exploration
Akifumi YumotoDepartment of Physics, College of Humanities and Sciences, Nihon University, Tokyo 156-8550, JapanDaisuke NittaAstronomical Institute, Tohoku University, Aoba Aramaki Aoba, Sendai 980-8578, JapanTakeshi ChibaDepartment of Physics, College of Humanities and Sciences, Nihon University, Tokyo 156-8550, JapanNaoshi SugiyamaDepartment of Physics, Nagoya University, Chikusa, Nagoya 464-8602, Japan
2012en
ABI
Annotatsiya
Shadows of multi-black holes have structures distinct from the mere superposition of the shadow of a single black hole: the eyebrow-like structures outside the main shadows and the deformation of the shadows. We present analytic estimates of these structures using the static multi-black hole solution (Majumdar-Papapetrou solution). We show that the width of the eyebrow is related to the distance between the black holes and that the shadows are deformed into ellipses due to the presence of the second black holes. These results are helpful to understand qualitatively the features of the shadows of colliding black holes. We also present the shadows of colliding or coalescing black holes in the Kastor-Traschen solution.
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