论文标题
来自SGR A $^*$的喷气机和Fermi/Erosita Bubbles的起源
Misaligned jets from Sgr A$^*$ and the origin of Fermi/eROSITA bubbles
论文作者
论文摘要
费米气泡起源的主要解释之一是银河中心超级质量黑洞Sgr a $^*$的过去喷气活动。通常认为所声称的喷气机垂直于银河平面。由PC规模的核恒星磁盘和气体流的方向以及事件地平线望远镜推断出的SGR A $^*$倾斜度低的倾斜度，我们进行了核射流的流体动力学模拟，相对于银河旋转轴而言。 Fermi/Erosita Bubbles（FEB）的观察到的轴对称性和半间隔（FEBS）由于Sgr A $^*$而引起的，如果喷气式飞机具有超级埃德丁顿电源，则可以产生$^*$ 6 $ kyr）适用于合理的喷气开头（$ \ lyssim 10^\ circ $）。但是，即使在考虑电子温度非平衡之后，这种强大的爆炸与观察到的O VIII/O VII线路比与气泡的比率不兼容。我们认为，生产FEB的唯一剩下的选项是i）低亮度（$ \ 10^{40.5-41} $ erg s $^{ - 1} $）磁占主导地位的喷气或增压风，sgr a $^*$，以及ii）来自SNE或tde驱动的风光，来自类似的Galactic中心。
One of the leading explanations for the origin of Fermi Bubbles is a past jet activity in the Galactic center supermassive black hole Sgr A$^*$. The claimed jets are often assumed to be perpendicular to the Galactic plane. Motivated by the orientation of pc-scale nuclear stellar disk and gas streams, and a low inclination of the accretion disk around Sgr A$^*$ inferred by the Event Horizon Telescope, we perform hydrodynamical simulations of nuclear jets significantly tilted relative to the Galactic rotation axis. The observed axisymmetry and hemisymmetry (north-south symmetry) of Fermi/eROSITA bubbles (FEBs) due to quasi-steady jets in Sgr A$^*$ can be produced if the jet had a super-Eddington power ($\gtrsim 5\times 10^{44}$ erg s$^{-1}$) for a short time (jet active period $\lesssim 6$ kyr) for a reasonable jet opening angle ($\lesssim 10^\circ$). Such powerful explosions are, however, incompatible with the observed O VIII/O VII line ratio towards the bubbles, even after considering electron-proton temperature non-equilibrium. We argue that the only remaining options for producing FEBs are i) a low-luminosity ($\approx 10^{40.5-41}$ erg s$^{-1}$)) magnetically dominated jet or accretion wind from the Sgr A$^*$, and ii) a SNe or TDE driven wind of a similar luminosity from the Galactic center.
