标题： 由绕巴德恩和阿永-贝托-加西亚时空旋转的开普勒盘产生的轮廓光谱线 显示英文标题

标题： Profiled spectral lines generated by Keplerian discs orbiting in the Bardeen and Ayon-Beato-Garcia spacetimes

摘要： Keplerian盘在Bardeen和Ayon-Beato-Garcia（ABG）黑洞以及无视界时空中的直接和间接图像的形状和频率偏移图被确定。 然后构建了在Bardeen和ABG时空中的Keplerian盘最内部分产生的光谱线轮廓。 频率偏移图和轮廓光谱线与在Schwarzschild黑洞场中产生的进行比较，并讨论了常规黑洞和无视界时空可能具有观测意义的特征。 我们证明，相对于Schwarzschild时空，无视界时空的差异比常规黑洞时空的差异要深刻得多，并且随着时空电荷参数的增加而增加。 对于小和大倾角，差异比中等倾角更强。 对于无视界时空，如果已知到远处观测者的倾角，这些差异可以用来区分Bardeen和ABG时空。 我们还表明，所谓的鬼像对轮廓线的贡献随着时空电荷参数的增加而增加。 显示英文摘要

摘要： Shape and frequency-shift map of direct and indirect images of Keplerian discs orbiting in Bardeen and Ayon-Beato-Garcia (ABG) black hole and no-horizon spacetimes are determined. Then profiles of spectral lines generated in the innermost parts of the Keplerian discs in the Bardeen and ABG spacetimes are constructed. The frequency-shift maps and profiled spectral lines are compared to those generated in the field of Schwarzschild black holes and possible observationally relevant signatures of the regular black hole and no-horizon spacetimes are discussed. We demonstrate that differences relative to the Schwarzschild spacetimes are for the no-horizon spacetimes much more profound in comparison to the regular black hole spacetimes and increase with increasing charge parameter of the spacetime. The differences are stronger for small and large inclination angles than for mediate ones. For the no-horizon spacetimes, the differences enable to distinguish the Bardeen and ABG spacetime, if inclination angle to the distant observer is known. We also show that contribution of the so called ghost images to the profiled lines increases with increasing charge parameter of the spacetimes.