原型致密对称天体B2352 +495中HI的观测
VLBA Observations of HI in the Archetype Compact Symmetric Object B2352+495
摘要：
B2352+495是紧凑对称天体（CSO）的原型。它有一个双射电波瓣对称地位于相对于中央平频谱无线电核心（AGN的位置），并具有小于200 pc的物理范围。在这项工作中，我们报告VLBA观测到的21厘米HI吸收朝向B2352+495调查这个显着的无线电源的属性，特别是，探索无线电发射是否可以被限制的环核材料（挫折的情况下）或源是否可能是年轻的。我们证实了先前在B2352+495方向探测到的两个HI吸收特征--一条几乎以星系系统速度为中心的宽线和一个窄的红移分量。来自宽吸收分量的原子气体可能与环核物质有关，这与当前超大质量黑洞周围环形结构中的cluploid HI分布范例一致。
英文摘要：
B2352+495 is a prototypical example of a Compact Symmetric Object (CSO). It has a double radio lobe symmetrically located with respect to a central flat spectrum radio core (the location of the AGN) and has a physical extent of less than 200 pc. In this work we report VLBA observation of 21 cm HI absorption toward B2352+495 to investigate the properties of this remarkable radio source, in particular, to explore whether the radio emission can be confined by circumnuclear material (frustration scenario) or whether the source is likely to be young. We confirmed the two HI absorption features previously detected toward B2352+495 - a broad line nearly centered at the systemic velocity of the galaxy and a narrow redshifted component. The atomic gas from the broad absorption component is likely associated with circumnuclear material, consistent with the current paradigm of clumpy HI distribution in toroidal structures around supermassive black holes.
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