论文标题
银河凸出的宜居性
The Habitability of the Galactic Bulge
论文作者
论文摘要
我们对银河系凸起的可居住性进行了新的研究，该研究扩大了银河宜居区的先前研究。我们讨论了有关凸起，金属性以及岩石行星，轨道稳定性和相遇的可能频率以及中央超级质量黑洞周围行星的可能性的现有知识。我们专注于两个方面，这些方面可以在磁盘中对环境产生实质性差异：（i）由于中央黑洞的存在以及超新星爆炸的最高速率，以及（ii）推定的石层植物植物机制在恒星系统之间扩散生活的效率。我们在凸起中使用恒星密度的分析模型，以估计灾难性事件的发生率以及在星际距离上生命的扩散时间尺度。
We present a new investigation of the habitability of the Milky Way bulge, that expands previous studies on the Galactic Habitable Zone. We discuss existing knowledge on the abundance of planets in the bulge, metallicity and the possible frequency of rocky planets, orbital stability and encounters, and the possibility of planets around the central supermassive black hole. We focus on two aspects that can present substantial differences with respect to the environment in the disk: (i) the ionizing radiation environment, due to the presence of the central black hole and to the highest rate of supernovae explosions and (ii) the efficiency of putative lithopanspermia mechanism for the diffusion of life between stellar systems. We use analytical models of the star density in the bulge to provide estimates of the rate of catastrophic events and of the diffusion timescales for life over interstellar distances.
