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arXiv 0704.2131astro-ph
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Pictor A射电瓣的X射线空间分辨研究

Radio Lobes of Pictor A: an X-ray spatially resolved Study

G. Migliori, P. Grandi, G. G. C. Palumbo, G. Brunetti, C. Stanghellini

摘要:

一项新的XMM观测使得对射电星系Pictor A的两个叶的详细研究成为可能。它们的X射线发射是非热源的,是由于微波背景光子被波瓣中的相对论电子逆康普顿散射所致,在两个波瓣中,均分磁场(Beq)大于由射电和X射线通量比计算的逆康普顿值(Bic)。Beq/Bic比值从未低于2,尽管有大量合理的假设被用来计算Beq,这表明波瓣的能量主要由粒子控制。X射线数据质量良好,足以进行空间分辨分析。我们的研究表明,Bic在各个脑叶中是不同的。它似乎在热点后面增加。相反,观察到颗粒的相当均匀的分布。因此,沿波瓣的无线电通量密度变化似乎主要是由磁场变化驱动的。

英文摘要:

A new XMM observation has made possible a detailed study of both lobes of the radio galaxy Pictor A. Their X-ray emission is of non thermal origin and due to Inverse Compton scattering of the microwave background photons by relativistic electrons in the lobes, as previously found. In both lobes, the equipartition magnetic field (Beq) is bigger than the Inverse Compton value (Bic), calculated from the radio and X-ray flux ratio. The Beq/Bic ratio never gets below 2, in spite of the large number of reasonable assumptions tested to calculate Beq, suggesting a lobe energetic dominated by particles. The X-ray data quality is good enough to allow a spatially resolved analysis. Our study shows that Bic varies through the lobes. It appears to increase behind the hot spots. On the contrary, a rather uniform distribution of the particles is observed. As a consequence, the radio flux density variation along the lobes appears to be mainly driven by magnetic field changes.

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