arXiv 1903.025712019-03-06astro-ph.GAastro-ph.HE

银心区磁化热气外流的X射线观测

X-ray Observation of a Magnetized Hot Gas Outflow in the Galactic Center Region

Shinya Nakashima, Katsuji Koyama, Q. Daniel Wang, Rei Enokiya

备注：: 9 pages, accepted for publication in ApJ
DOI：: 10.3847/1538-4357/ab0d82

摘要：

我们报告了用朱雀号卫星在北银河系中心（GC）区域观测到的$1^\circ$尺度的X射线羽流。烟羽位于（$l$，$b$）$\sim$（$0\mbox{$ .\！\！^ \circ $}2$，$0\mbox{$ .\！\！^ \circ $}6$），以前的研究报告的电波瓣以东。在射电瓣的内部或西面没有发现明显的X射线过量。羽流的光谱表现出强烈的发射线，从高度电离的镁，硅，和S，再现薄的热等离子体模型与$kT \sim 0.7$ keV和太阳金属丰度。没有非平衡电离的特征。在1.5-3.0 keV波段，未吸收表面亮度为$3\times10^{-14}$ erg cm $^{-2}$ s $^{-1}$ arcmin $^{-2}$。在软X射线波段的强星际吸收表明，羽流不是一个前景源，但在GC的距离，给出了一个物理大小为$\sim$ 100 pc，密度为0.1 cm $^{-3}$，热压力为$1\times10^{-10}$ erg cm $^{-3}$，质量为600 $M_\odot$和热能为$7\times10^{50}$ erg。从与偏振射电辐射的明显关联，我们提出X射线羽流是从GC流出的磁化热气体。

英文摘要：

We report the discovery of a $1^\circ$ scale X-ray plume in the northern Galactic Center (GC) region observed with Suzaku. The plume is located at ($l$, $b$) $\sim$ ($0\mbox{$.\!\!^\circ$}2$, $0\mbox{$.\!\!^\circ$}6$), east of the radio lobe reported by previous studies. No significant X-ray excesses are found inside or to the west of the radio lobe. The spectrum of the plume exhibits strong emission lines from highly ionized Mg, Si, and S that is reproduced by a thin thermal plasma model with $kT \sim 0.7$ keV and solar metallicity. There is no signature of non-equilibrium ionization. The unabsorbed surface brightness is $3\times10^{-14}$ erg cm$^{-2}$ s$^{-1}$ arcmin$^{-2}$ in the 1.5-3.0 keV band. Strong interstellar absorption in the soft X-ray band indicates that the plume is not a foreground source but is at the GC distance, giving a physical size of $\sim$100 pc, a density of 0.1 cm$^{-3}$, thermal pressure of $1\times10^{-10}$ erg cm$^{-3}$, mass of 600 $M_\odot$ and thermal energy of $7\times10^{50}$ erg. From the apparent association with a polarized radio emission, we propose that the X-ray plume is a magnetized hot gas outflow from the GC.

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