论文标题
由旋转和非线性磁性的黑洞在完美的液体暗物质中铸造的阴影
Shadow cast by a rotating and nonlinear magnetic-charged black hole in perfect fluid dark matter
论文作者
论文摘要
我们得出了一个由完美的流体暗物质（PFDM）包围的球形对称Hayward黑洞的精确溶液。通过应用Newman-Janis算法，我们将其推广到相应的旋转黑洞。然后，我们研究了pfdm中旋转海沃德黑洞的阴影。阴影的明显形状取决于黑洞旋转$ a $，磁性电荷$ q $和pfdm强度参数$ k $（$ k <0 $）。在非旋转情况（$ a = 0 $）中，阴影是一个完美的圆圈，在旋转情况（$ a \ neq {0} $）中变形。对于$ a $的固定值，阴影的大小随着$ \ vert {k} \ vert $的增加而增加，但随着$ q $的增加而减小。我们进一步研究了黑洞的排放率。我们发现，随着$ \ vert {k} \ vert $（或$ q $）的增加，排放率降低，并且排放的峰值转移到较低的频率。最后，我们讨论了与银河系中心的超级质量黑洞$ \ mathrm {sgr \ a^{*}} $相对应的观测前景。
We derived an exact solution of the spherically symmetric Hayward black hole surrounded by perfect fluid dark matter (PFDM). By applying the Newman-Janis algorithm, we generalized it to the corresponding rotating black hole. Then, we studied the shadows of rotating Hayward black hole in PFDM. The apparent shape of the shadow depends upon the black hole spin $a$, the magnetic charge $Q$ and the PFDM intensity parameter $k$ ($k<0$). The shadow is a perfect circle in the non-rotating case ($a=0$) and a deformed one in the rotating case ($a\neq{0}$). For a fixed value of $a$, the size of the shadow increases with the increasing $\vert{k}\vert$, but decreases with the increasing $Q$. We further investigated the black hole emission rate. We found that the emission rate decreases with the increasing $\vert{k}\vert$ (or $Q$) and the peak of the emission shifts to lower frequency. Finally, we discussed the observational prospects corresponding to the supermassive black hole $\mathrm{Sgr\ A^{*}}$ at the center of the Milky Way.
