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arXiv 2307.02541astro-ph.HEastro-ph.GA
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第二博洛尼亚星表源的多波段环境

The Multi-Wavelength Environment of Second Bologna Catalog Sources

A. Paggi, F. Massaro, H. Peña-Herazo, V. Missaglia, A. Jimenez-Gallardo, F. Ricci, S. Ettori, G. Giovannini, F. Govoni, R. D. Baldi, B. Mingo, M. Murgia, E. Liuzzo, F. Galati

AI总结:

本文利用钱德拉X射线观测研究第二博洛尼亚星表强射电源的延展辐射,发现核辐射、热斑/喷流节点增亮及X射线空腔等结构,并通过光谱分析揭示内禀吸收和热气体性质,证明低频射电选择结合短时钱德拉观测可有效研究射电源的X射线环境。

摘要:

我们展示了强大的射电源第二博洛尼亚星表(B2CAT)的钱德拉冷目标(CCT)巡天的首批结果,旨在研究这些源周围的延展X射线辐射。对于B2CAT CCT巡天中首批观测的33个源,我们进行了成像和光谱X射线分析,生成了多波段钱德拉图像,并将其与射电观测进行了比较。为评估X射线中延展辐射的存在,我们提取了表面通量轮廓,并将其与模拟的ACIS点扩散函数进行了比较。我们探测到28个源的X射线核辐射。此外,我们探测到8个源自射电热斑或喷流节点的X射线通量增强区域,以及一个可能与X射线空腔相关的通量减弱区域。我们对15个核进行了X射线光谱分析,发现其中4个的内禀吸收显著大于银河系值。我们在5个源中探测到显著的延展X射线辐射,并用气体温度约为2 keV的热模型拟合了它们的光谱。在B2.1 0742+31的情况下,周围的热气体与低光度星系团中的星系团内介质(ICM)相符,而围绕高度扰动的宽角尾射电源B2.3 2254+35的X射线弥散辐射的光度与相对明亮的星系群的光度相似,尽管其温度与低光度星系团的温度相似。这些结果凸显了低频射电选择与短时钱德拉快照观测相结合的能力,可用于研究射电源X射线辐射的性质。

英文摘要:

We present the first results of the Chandra Cool Targets (CCT) survey of the Second Bologna Catalog (B2CAT) of powerful radio sources, aimed at investigating the extended X-ray emission surrounding these sources. For the first 33 sources observed in the B2CAT CCT survey, we performed both imaging and spectral X-ray analysis, producing multi-band Chandra images, and compared them with radio observations. To evaluate the presence of extended emission in the X-rays, we extracted surface flux profiles comparing them with simulated ACIS Point Spread Functions. We detected X-ray nuclear emission for 28 sources. In addition, we detected 8 regions of increased X-ray flux originating from radio hot-spots or jet knots, and a region of decreased flux, possibly associated with an X-ray cavity. We performed X-ray spectral analysis for 15 nuclei and found intrinsic absorption significantly larger than the Galactic values in four of them. We detected significant extended X-ray emission in five sources, and fitted their spectra with thermal models with gas temperatures $\sim 2 \text{ keV}$. In the case of B2.1 0742+31, the surrounding hot gas is compatible with the ICM of low luminosity clusters of galaxies, while the X-ray diffuse emission surrounding the highly disturbed WAT B2.3 2254+35 features a luminosity similar to those of relatively bright galaxy groups, although its temperature is similar to those of low luminosity galaxy clusters. These results highlight the power of the low-frequency radio selection, combined with short Chandra snapshot observations, to investigate the properties of the X-ray emission from radio sources.

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