Using deep archival observations from the Chandra X-ray Observatory, we present an analysis of linear X-ray-emitting features located within the southern portion of the Galactic center chimney and oriented orthogonal to the Galactic plane, centered at coordinates l = 0.°08, b = −1.°42. The surface brightness and hardness ratio patterns are suggestive of a cylindrical morphology, which may have been produced by a plasma outflow channel extending from the Galactic center. Our fits of the feature’s spectra favor a complex two-component model consisting of thermal and recombining plasma components, possibly a sign of shock compression or heating of the interstellar medium by outflowing material. Assuming a recombining plasma scenario, we further estimate the cooling timescale of this plasma to be on the order of a few hundred to thousands of years, leading us to speculate that a sequence of accretion events onto the Galactic black hole may be a plausible quasi-continuous energy source to sustain the observed morphology.

中文翻译：

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来自银河中心烟囱中央“排气口”的 X 射线

利用钱德拉 X 射线天文台的深度档案观测，我们对位于银河系中心烟囱南部、与银河平面正交、以坐标为中心的线性 X 射线发射特征进行了分析我= 0.°08,乙= −1.°42。表面亮度和硬度比图案暗示了圆柱形形态，这可能是由从银河中心延伸的等离子体流出通道产生的。我们对特征光谱的拟合有利于由热和重组等离子体成分组成的复杂双成分模型，这可能是流出材料对星际介质进行冲击压缩或加热的迹象。假设重组等离子体场景，我们进一步估计该等离子体的冷却时间尺度约为几百到数千年，这使我们推测银河系黑洞上的一系列吸积事件可能是一个看似合理的准事件。持续的能源来维持观察到的形态。