关于z=0 X射线吸收体的性质：I.来自外部组织的线索
On the nature of the z=0 X-ray absorbers: I. Clues from an external group
摘要：
在河外视线的高质量Chandra谱中观测到OVII的零红移吸收线。产生这些线的吸收体的位置，无论是来自银河系的日冕还是来自本星系群，甚至是更大规模的结构，一直是一个争论的问题。在这里，我们研究另一个像我们的本星系团这样的穷人群体，以了解从星系到群体尺度的柱密度分布。我们表明，我们还不能排除组起源的z=0系统。我们进一步认为，关于z=0系统的银河系与河外起源的争论还为时过早，因为它们可能包含两种成分，并预测未来更高分辨率的观测将把z=0系统分解为多个成分。
英文摘要：
Absorption lines of OVII at redshift zero are observed in high quality Chandra spectra of extragalactic sightlines. The location of the absorber producing these lines, whether from the corona of the Galaxy or from the Local Group or even larger scale structure, has been a matter of debate. Here we study another poor group like our Local Group to understand the distribution of column density from galaxy to group scales. We show that we cannot yet rule out the group origin of z=0 systems. We further argue that the debate over Galactic vs. extragalactic origin of z=0 systems is premature as they likely contain both components and predict that future higher resolution observations will resolve the z=0 systems into multiple components.
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