Offsets between X-Ray and Radio Components in X-Ray Jets: The AtlasX

Offsets between X-Ray and Radio Components in X-Ray Jets: The AtlasX
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X 射线喷射器中 X 射线和无线电组件之间的偏移:AtlasX

DOI:
10.3847/1538-4365/aca321
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发表时间:
2022
期刊:
The Astrophysical Journal Supplement Series
影响因子:
--
通讯作者:
K. Kollmann
K. Kollmann
中科院分区:
--
文献类型:
--
作者:
Karthik Reddy;M. Georganopoulos;E. Meyer;M. Keenan;K. Kollmann

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强大的河外喷流的X射线发射机制对它们的环境影响有重要意义,但人们对它的了解很少。喷流的各个特征中的X射线/射电位置偏移提供了重要的线索。扩展Reddy等人先前的工作,我们提出了一个详细的比较X射线地图,反卷积使用低计数图像重建和分析工具,和无线电地图的164个组成部分,从77个钱德拉探测X射线喷流。我们检测到94个偏移(57%),其中58个新检测。在FR II型喷流结中,大约一半的情况下X射线在射电之前达到峰值并衰减,这与单区模型的预测不一致。虽然类似数量的节点缺乏统计上显着的偏移量,我们认为,投影和距离效应的结果低于检测水平的偏移。类似的去投影偏移意味着X射线可能比无线电更紧凑,对于大多数结,我们定性地再现了这一发现与“移动结”模型。在这个模型下,纽结的整体洛伦兹因子(r)与先前基于射电的估计一致,表明千秒差距尺度的喷流只是轻微的相对论性。对X射线/射电通量比分布的分析并不支持宇宙微波背景的逆康普顿散射产生X射线的常见机制,但确实显示了通量比随离地核距离的变化而下降的轻微显著趋势。我们的研究结果意味着需要多区模型来解释强大的射流的X射线发射。我们在http://astro.umbc.edu/Atlas-X上提供了X射线射流样品的交互式列表。
The X-ray emission mechanism of powerful extragalactic jets—which has important implications for their environmental impacts—is poorly understood. The X-ray/radio positional offsets in the individual features of jets provide important clues. Extending previous work in Reddy et al., we present a detailed comparison between X-ray maps, deconvolved using the Low-count Image Reconstruction and Analysis 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 deprojected 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 (Γ) derived for knots under this model is consistent with previous radio-based estimates, suggesting that kiloparsec-scale jets are only mildly relativistic. An analysis of the 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 the 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 sample at http://astro.umbc.edu/Atlas-X.
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