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arXiv 0710.0955astro-ph
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XMM-牛顿明亮的偶然发现巡天。鉴别和光谱特性

The XMM-Newton bright serendipitous survey. Identification and optical spectral properties

A. Caccianiga, P. Severgnini, R. Della Ceca, T. Maccacaro, F. Cocchia, X. Barcons, F. J. Carrera, I. Matute, R. G. McMahon, M. J. Page, W. Pietsch, B. Sbarufatt… 展开作者

A. Caccianiga, P. Severgnini, R. Della Ceca, T. Maccacaro, F. Cocchia, X. Barcons, F. J. Carrera, I. Matute, R. G. McMahon, M. J. Page, W. Pietsch, B. Sbarufatti, A. Schwope, J. A. Tedds, M. G. Watson

摘要:

目标:我们提出的光学分类和红移的348个X射线源从XMM-牛顿明亮偶发巡天(XBS),其中包含400个对象(识别水平= 87%)。约240个是新的身份。特别是,我们详细讨论了活动星系核人口的分类标准。方法:通过系统的光谱活动和文献检索,我们收集了XBS调查中绝大多数来源的光谱,并应用了定义明确的分类"流程图“。研究结果:我们发现,活动星系核在XBS观测的通量极限(~10^-13 erg cm^-2 s^-1)处代表着数量最多的粒子群,构成了80%的在0.5-4.5 keV能量带内选定的XBS源和95%的"硬“(4.5-7.5 keV)选定天体。银河系的来源主要分布在0.5-4.5 keV的样本中(17%),而在4.5-7.5 keV的样本中仅占3%。两个样本中剩下的来源是星系团/星系群和正常星系(即可能不是由AGN提供动力)。此外,从0.5- 4.5keV样品(f=N_AGN2/N_AGN=7%)到4.5- 7.5keV样品(f=32%),第2类活动星系核(即光吸收的A_V> 2 mag的活动星系核)的百分比显著增加。最后,我们提出了两个简单的诊断图,可以很容易地用来获得相对低红移活动星系核的光谱分类,即使光谱的质量是不好的。

英文摘要:

AIMS: We present the optical classification and redshift of 348 X-ray selected sources from the XMM-Newton Bright Serendipitous Survey (XBS) which contains a total of 400 objects (identification level = 87%). About 240 are new identifications. In particular, we discuss in detail the classification criteria adopted for the Active Galactic Nuclei population. METHODS: By means of systematic spectroscopic campaigns and through the literature search we have collected an optical spectrum for the large majority of the sources in the XBS survey and applied a well-defined classification ``flow-chart''. RESULTS: We find that the AGN represent the most numerous population at the flux limit of the XBS survey (~10^-13 erg cm^-2 s^-1) constituting 80% of the XBS sources selected in the 0.5-4.5 keV energy band and 95% of the ``hard'' (4.5-7.5 keV) selected objects. Galactic sources populate significantly the 0.5-4.5 keV sample (17%) and only marginally (3%) the 4.5-7.5 keV sample. The remaining sources in both samples are clusters/groups of galaxies and normal galaxies (i.e. probably not powered by an AGN). Furthermore, the percentage of type2 AGN (i.e. optically absorbed AGNs with A_V>2mag) dramatically increases going from the 0.5-4.5 keV sample (f=N_AGN2/N_AGN=7%) to the 4.5-7.5 keV sample (f=32%). We finally propose two simple diagnostic plots that can be easily used to obtain the spectral classification for relatively low redshift AGNs even if the quality of the spectrum is not good.

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。

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