论文标题
X射线喷气机中X射线和无线电组件之间的偏移:Atlasx
Offsets between X-ray and Radio Components in X-ray Jets: The AtlasX
论文作者
论文摘要
对环境影响具有重要意义的强大的X射线排放机制对其环境的影响具有重要意义。喷气机的各个特征中的X射线/无线电位置偏移提供了重要的线索。扩展了Reddy等人的先前工作。 2021年,我们使用低计数图像重建和分析(LIRA)工具(LIRA)工具(LIRA)工具和164个组件的无线电图进行了X射线映射对v卷的详细比较。我们检测到94个偏移(57%),并有58个新检测。在FR II型喷射结中,X射线峰和无线电前的衰减在大约一半的情况下,与单区模型的预测不同意。尽管类似数量的结缺乏统计学上显着的偏移,但我们认为投影和距离效应会导致检测水平以下的偏移。类似的DE推出偏移量意味着对于大多数结,X射线可能比无线电更紧凑,并且我们通过“移动结”模型定性地重现了这一发现。在该模型下,为结的批量洛伦兹因子与以前的基于无线电的估计相一致,这表明KPC尺度的喷气机仅是相对论的。对X射线/无线电比率分布的分析不支持宇宙微波背景逆康普顿散射X射线产生的普遍调用机制,但确实显示出略有显着的磁通量比磁通量的趋势是与核心距离距离的函数。我们的结果意味着需要多区模型来解释功能强大的喷气机的X射线发射。我们在http://astro.umbc.edu/atlas-x上提供了X射线喷气样品的交互式列表。
The X-ray emission mechanism of powerful extragalactic jets, which has important implications for their environmental impact, is poorly understood. The X-ray/radio positional offsets in individual features of jets provide important clues. Extending the previous work in Reddy et al. 2021, we present a detailed comparison between X-ray maps deconvolved using the Low Count Image Reconstruction and Analysis (LIRA) tool and radio maps of 164 components from 77 Chandra-detected X-ray jets. We detect 94 offsets (57%), with 58 new detections. In FR II-type jet knots, the X-rays peak and decay before the radio in about half the cases, disagreeing with the predictions of one-zone models. While a similar number of knots lack statistically significant offsets, we argue that projection and distance effects result in offsets below the detection level. Similar de-projected offsets imply that X-rays could be more compact than radio for most knots, and we qualitatively reproduce this finding with a "moving-knot" model. The bulk Lorentz factor derived for knots under this model is consistent with previous radio-based estimates, suggesting kpc-scale jets are only mildly relativistic. An analysis of X-ray/radio flux ratio distributions does not support the commonly invoked mechanism of X-ray production from inverse Compton scattering of the cosmic microwave background but does show a marginally significant trend of declining flux ratio as a function of distance from the core. Our results imply the need for multi-zone models to explain the X-ray emission from powerful jets. We provide an interactive list of our X-ray jet samples at http://astro.umbc.edu/Atlas-X.