玉夫座星系NGC 7793中微类星体S26的物理参数
The Physical Parameters of the Micro-quasar S26 in the Sculptor Group Galaxy NGC 7793
摘要：
NGC 7793 - S26是一个扩展源（350 pc $\times$ 185 pc），以前在无线电，光学和X射线领域进行了研究。它已被确认为一个微型类星体，膨胀了一个超级泡沫。我们用ANU 2.3米望远镜上的宽视场摄谱仪的积分场光谱分析了3600- 7000毫微米之间的光谱。这使我们能够获得选定的星云线的通量和线比。应用辐射冲击模型诊断，我们估计冲击速度，密度，辐射年龄和压力的对象。我们发现，S26是刚刚进入其辐射阶段，北部和西部地区占主导地位的部分辐射冲击，由于在这些方向上的低密度ISM。我们确定的膨胀速度沿射流的330公里秒$^{-1}$，和膨胀的气泡在短轴方向的速度为132公里秒$^{-1}$。我们确定该结构的年龄为$4.1\times10^5$年，喷流能量通量为$ (4-10)\times10^{40}$ erg s $^{-1}$。喷流似乎在$\sim0.25$度内准直，并经历非常小的进动。如果是相对论性的$β\sim 1/3$，那么大约4 M的相对论性物质$_{\odot}$已经被喷流处理过了。我们的结论是，在S26的中心对象可能是一个黑洞的质量典型的超亮X射线源人口，目前正在消耗一个相当大的同伴通过罗氏瓣吸积。
英文摘要：
NGC 7793 - S26 is an extended source (350 pc $\times$ 185 pc) previously studied in the radio, optical and x-ray domains. It has been identified as a micro-quasar which has inflated a super bubble. We used Integral Field Spectra from the Wide Field Spectrograph on the ANU 2.3 m telescope to analyse spectra between 3600--7000 Å. This allowed us to derive fluxes and line ratios for selected nebular lines. Applying radiative shock model diagnostics, we estimate shock velocities, densities, radiative ages and pressures across the object. We show that S26 is just entering its radiative phase, and that the northern and western regions are dominated by partially-radiative shocks due to a lower density ISM in these directions. We determine a velocity of expansion along the jet of 330 km s$^{-1}$, and a velocity of expansion of the bubble in the minor axis direction of 132 km s$^{-1}$. We determine the age of the structure to be $4.1\times10^5$ yr, and the jet energy flux to be $ (4-10)\times10^{40}$ erg s$^{-1}$ The jet appears to be collimated within $\sim0.25$ deg, and to undergo very little precession. If the relativistic $β\sim 1/3$, then some 4 M$_{\odot}$ of relativistic matter has already been processed through the jet. We conclude that the central object in S26 is probably a Black Hole with a mass typical of the ultra-luminous X-ray source population which is currently consuming a fairly massive companion through Roche Lobe accretion.
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