吉赫兹峰谱射电星系的X射线观测
The X-ray view of Giga-Hertz Peaked Spectrum Radio Galaxies
摘要：
本文给出了16千兆赫兹峰谱（GPS）星系的通量和体积有限的完整样品的X射线性质。这项研究解决了三个基本问题，在我们的理解的性质和演变的GPS源：a）什么是物理起源的X射线发射的GPS星系？b）与X射线遮蔽相关的物理系统是什么？c）致密射电源演化的“终点”是什么？我们在0.5-2 keV（0.5-10 keV）的能带中获得了100%（94%）的检测分数。GPS星系的X射线光谱通常是高度模糊的。X射线柱密度比在无线电中测量的HI柱密度高10至100倍。GPS星系很好地外推到高射电功率的无线电和X射线光度之间的相关性在低光度的FRI射电星系。另一方面，GPS星系的X射线光度与FRII射电星系相当，尽管它们的射电光度要高得多。在我们的样本中的X射线射电光度比分布是一致的大部分的高能量发射所产生的吸积盘，以及与动力学模型的GPS演变的X射线产生的康普顿向上散射的环境光子。对前一种情况的进一步支持来自GPS星系在X射线与O[III]光度比与柱密度平面中的位置。我们认为GPS星系是年轻的射电源，这将达到其完全成熟的经典FRII射电星系。然而，柱密度~10^{22}原子/cm/cm可能导致基于热点衰退速度测量的动力学年龄测定的显著低估。（节略）
英文摘要：
This paper presents the X-ray properties of a flux- and volume-limited complete sample of 16 Giga-Hertz Peaked Spectrum (GPS) galaxies. This study addresses three basic questions in our understanding of the nature and evolution of GPS sources: a) What is the physical origin of the X-ray emission in GPS galaxies? b) What physical system is associated with the X-ray obscuration? c) What is the "endpoint" of the evolution of compact radio sources? We obtain a 100% (94%) detection fraction in the 0.5-2 keV (0.5-10 keV) energy band. GPS galaxy X-ray spectra are typically highly obscured. The X-ray column density is higher than the HI column density measured in the radio by a factor of 10 to 100. GPS galaxies lie well on the extrapolation to high radio powers of the correlation between radio and X-ray luminosity known in low-luminosity FRI radio galaxies. On the other hand, GPS galaxies exhibit a comparable X-ray luminosity to FRII radio galaxies, notwithstanding their much higher radio luminosity. The X-ray to radio luminosity ratio distribution in our sample is consistent with the bulk of the high-energy emission being produced by the accretion disk, as well as with dynamical models of GPS evolution where X-rays are produced by Compton upscattering of ambient photons. Further support for the former scenario comes from the location of GPS galaxies in the X-ray to O[III] luminosity ratio versus column density plane. We propose that GPS galaxies are young radio sources, which would reach their full maturity as classical FRII radio galaxies. However, column densities ~10^{22} atoms/cm/cm could lead to a significant underestimate of dynamical age determinations based on the hotspot recession velocity measurements. (abridged)
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