XMM-牛顿广角巡天（XWAS）
The XMM-Newton Wide Angle Survey (XWAS)
摘要：
该方案的目的是获得迄今为止已查明的活动星系核的最大X射线选定样本之一，以便在宇宙大部分吸积力的起源地-中等通量处对这类星系核进行计数。我们提出了XMM-牛顿广角巡天（XWAS），一个新的目录，通过光学观测光谱确定了近一千个X射线源。在68个XMM-牛顿指向观测中检测到的X射线源的样本被选择用于光学多纤维光谱学。X射线源的光学对应物和相应的光度测定是从超级宇宙巡天获得的。光谱学的候选者最初选择的幅度低至R~21，优先选择通量F（0.5-4.5 keV）>10^-14 erg s^-1 cm^-2的X射线源。分析了在英澳望远镜2度视场进行的光学光谱观测，并根据光学发射谱线对所得光谱进行了分类。我们已经通过光谱学在天空约11.8度^[2]的范围内确定了940个X射线源。在我们的样本中的源种群可以概括为65%的宽线活动星系核（BLAGN），16%的窄发射线星系（NELG），6%的吸收线星系（ALG）和13%的恒星。一个活跃的原子核很可能也存在于绝大多数X射线源光谱分类为NELG或ALG。源位于高银河纬度（|b| > 20度）XMM牛顿场，主要在南半球。由于XWAS在红移（0 < z < 4.25）和通量（10^-15 < F（0.5-4.5 keV）< 10^-12 erg s^-1 cm^-2）方面覆盖了很大的参数空间，这项工作为进一步研究子样本和特殊情况提供了极好的资源。本文介绍了河外天体的总体性质。
英文摘要：
This programme is aimed at obtaining one of the largest X-ray selected samples of identified active galactic nuclei to date in order to characterise such a population at intermediate fluxes, where most of the Universe's accretion power originates. We present the XMM-Newton Wide Angle Survey (XWAS), a new catalogue of almost a thousand X-ray sources spectroscopically identified through optical observations. A sample of X-ray sources detected in 68 XMM-Newton pointed observations was selected for optical multi-fibre spectroscopy. Optical counterparts and corresponding photometry of the X-ray sources were obtained from the SuperCOSMOS Sky Survey. Candidates for spectroscopy were initially selected with magnitudes down to R~21, with preference for X-ray sources having a flux F(0.5-4.5 keV) >10^-14 erg s^-1 cm^-2. Optical spectroscopic observations performed at the Anglo Australian Telescope Two Degree Field were analysed, and the derived spectra were classified based on optical emission lines. We have identified through optical spectroscopy 940 X-ray sources over ~11.8 deg^2 of the sky. Source populations in our sample can be summarised as 65% broad line active galactic nuclei (BLAGN), 16% narrow emission line galaxies (NELGs), 6% absorption line galaxies (ALGs) and 13% stars. An active nucleus is likely to be present also in the large majority of the X-ray sources spectroscopically classified as NELGs or ALGs. Sources lie in high-galactic latitude (|b| > 20 deg) XMM-Newton fields mainly in the southern hemisphere. Due to the large parameter space in redshift (0 < z < 4.25) and flux (10^-15 < F(0.5-4.5 keV) < 10^-12 erg s^-1 cm^-2) covered by the XWAS this work provides an excellent resource to further study subsamples and particular cases. The overall properties of the extragalactic objects are presented in this paper.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
