HST optical spectral index map of the jet of 3C 273
HST optical spectral index map of the jet of 3C 273
复制标题
3C 273射流的HST光学光谱指数图
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
J. Bank
中科院分区：
文献类型：
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作者：
S. Jester;H. Roeser;K. Meisenheimer;R. Perley;R. C. M. Heidelberg;Nrao Socorro;J. Bank
我们提出了在622 nm和300 nm的喷流在3C 273的HST图像，并确定了运行的光学光谱指数在0.2”沿着喷流。光谱指数变化的平滑性表明物理条件在喷流中平滑地变化。光通量和光谱指数之间没有相关性，这与相对论电子由于同步辐射而遭受强烈冷却的情况是一样的。我们没有发现局部加速或损失网站的证据。这表明光谱形状在整个喷流中变化不大。我们发现，相对论光束和/或次均分磁场不能消除光的传播时间之间的差异沿着射流和发射光学同步辐射的电子的寿命。我们认为这进一步的证据有利于分布式电子加速过程。
We present HST images at 622 nm and 300 nm of the jet in 3C273 and determine the run of the optical spectral index at 0.2" along the jet. The smoothness of spectral index changes shows that the physical conditions are varying smoothly across the jet. There is no correlation between the optical flux and spectral index, as would be expected for relativistic electrons suffering strong cooling due to synchrotron emission. We find no evidence for localized acceleration or loss sites. This suggests that the spectral shape is not changing much throughout the jet. We show that relativistic beaming and/or sub-equipartition magnetic fields cannot remove the discrepancy between light-travel time along the jet and the lifetime of electrons emitting optical synchrotron radiation. We consider this further evidence in favour of a distributed electron acceleration process.