Black hole shadow of a rotating polytropic black hole by the Newman--Janis algorithm without complexification

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In this work, starting from a spherically symmetric polytropic black hole, a rotating solution is obtained by following the Newman--Janis algorithm without complexification.

• Besides studying the horizon, the static conditions and causality issues of the rotating solution, we obtain and discuss the shape of its shadow.
• Some other physical features as the Hawking temperature and emission rate of the rotating polytropic black hole solution are also discussed.