THE INNER RADIO JET REGION AND THE COMPLEX ENVIRONMENT OF SS433
THE INNER RADIO JET REGION AND THE COMPLEX ENVIRONMENT OF SS433
复制标题
SS433的内部无线电射流区域和复杂环境
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
A. M. Stirling
中科院分区：
文献类型：
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作者：
Z. Paragi;R. Vermeulen;I. Feješ;R. Schilizzi;R. Spencer;A. M. Stirling
我们在1.6、5和15 GHz下对SS 433进行了多频VLBA+VLA观测。这些观测提供了有史以来为该物体制作的最高角分辨率的无线电频谱指数图。对SS 433在观测过程中各部件的运动进行了检测。除了通常的VLBI喷流结构，我们发现在一个异常的位置角系统中的两个无线电组件。这些新发现的无线电发射区可能与风一样的赤道外流或吸积盘的延伸有关。我们发现，无线电核心组件是分叉的东部和西部的翅膀之间的排放有一个明显的差距。对SS 433的旋进喷流和运动结的模型拟合表明，运动中心--即双星--位于西部和东部射电核心分量之间的差距。光谱特性和观察到的核心位置的变化表明，我们看到同步自吸收和外部自由-自由吸收的组合效应在最里面的AU尺度区域的源。电离物质的空间分布可能不是围绕双星球对称的，而是盘状的。
We present multi-frequency VLBA+VLA observations of SS433 at 1.6, 5 and 15 GHz. These observations provide the highest angular resolution radio spectral index maps ever made for this object. Motion of the components of SS433 during the observation is detected. In addition to the usual VLBI jet structure, we detect two radio components in the system at an anomalous position angle. These newly discovered radio emitting regions might be related to a wind-like equatorial outflow or to an extension of the accretion disk. We show that the radio core component is bifurcated with a clear gap between the eastern and western wings of emission. Modelfitting of the precessing jets and the moving knots of SS433 shows that the kinematic centre -- i.e. the binary -- is in the gap between the western and eastern radio core components. Spectral properties and observed core position shifts suggest that we see a combined effect of synchrotron self-absorption and external free-free absorption in the innermost AU-scale region of the source. The spatial distribution of the ionized matter is probably not spherically symmetric around the binary, but could be disk-like.