H I Absorption toward the Nucleus of the Radio Galaxy PKS 2322–123 in A2597
H I Absorption toward the Nucleus of the Radio Galaxy PKS 2322–123 in A2597
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A2597 中射电星系 PKS 2322–123 核的 H I 吸收
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
A. Koekemoer
中科院分区：
文献类型：
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作者：
G. Taylor;C. O’Dea;A. Peck;A. Koekemoer
我们在 1.3 和 5 GHz 下对 PKS 2322-123 的中心 0.″3 进行了灵敏、高分辨率的甚长基线阵列观测。这些观察结果揭示了从倒转光谱核心两侧出现的笔直且对称的喷流。在核心和东部急流的吸收中检测到了 21 厘米原子氢线，并且具有显着的不透明度，但在同样强大的西部急流上却看不到它。可以看到一条窄线（110 km s-1 FWHM）和一条非常宽的线（735 km s-1 FWHM），尽管非常宽的线仅在核心处可见。两条线相对于系统速度都有红移（~220±100 km s-1）。对观察到的 H I 运动学最可能的解释是，原子环以原子核为中心，具有相当大的湍流和向内流动的运动。该环面的鳞片高度小于20 pc。尽管在紧凑射电源的通量有限样本中很少见，但对称秒差距结构在具有 H I 吸收的射电星系中几乎无处不在，可能是因为通过环面观察它们更接近边缘。
We present sensitive, high-resolution Very Long Baseline Array observations of the central 0.″3 of PKS 2322-123 at 1.3 and 5 GHz. These observations reveal straight and symmetric jets emerging from both sides of an inverted spectrum core. The 21 cm line of atomic hydrogen is detected in absorption against the core and eastern jet with substantial opacities, but it is not seen toward the equally strong western jet. Both a narrow (110 km s-1 FWHM) and a very broad (735 km s-1 FWHM) line are seen, although the very broad line is seen only against the core. Both lines are redshifted (~220±100 km s-1) with respect to the systemic velocity. The most likely explanation for the observed H I kinematics are an atomic torus centered on the nucleus with considerable turbulence and inward streaming motions. The scale height of this torus is less than 20 pc. Although rare in flux-limited samples of compact radio sources, symmetric parsec-scale structure appears nearly ubiquitous among radio galaxies with H I absorption, probably because they are viewed more nearly edge-on through the torus.