ROSAT巡天X射线选活动星系核的光学证认  

Optical Identification of ROSAT Survey X-ray Selected AGN

作　　者：孙艳春[1] 白宇[1] 何香涛[1] 陈阳[1] 吴江华[2] 李庆康[1] Green Richard F. Voges Wolfgang 

机构地区：[1]北京师范大学天文系,北京100875 [2]中国科学院国家天文台,北京100012 [3]NOAO Kitt Peak National Observatory,USA Tucson AZ85726-6732 [4]Max-Planck-Institute fur Extrater-restrische Physik,Germany D85740Garching

出　　处：《天文学进展》2012年第1期106-124,共19页Progress In Astronomy

基　　金：国家基金委-中科院天文联合基金项目(10778717);北京师范大学自主科研基金资助项目(2009SD-8,22050205,2009SD-1)

摘　　要：获得完备的样本一直是类星体统计分析工作中至关重要的第一步。类星体巡天选择候选体的方法主要有射电波段筛选、色指数筛选、无缝光谱筛选、X射线波段筛选、对红外源或变源进行筛选和零自行的方法。单独运用任一方法都有选择效应,采用多波段方法可以极大地提高样本的完备性。阐述了使用多波段方法选择活动星系核样本的研究现状,提出多波段类星体巡天方法和选源判据,给出ROSAT巡天中F.1002,F.Coma,F.836和F.Leo 4个天区以及空源的15年来X射线选活动星系核的选源和光学新证认的AGN结果,表明多波段类星体巡天方法能有效地提高观测效率。The completeness of sample is especially important for the research of quasar, and using data in one wavelength, such as in radio, infrared, optical or Xray selection, to make candidate selection always suffers significant selection effect to some extent. Fortunately, some large area surveys have become increasingly prevalent across all wavelengths over the past decade, such as SDSS, NVSS, FIRST, RASS, etc. These surveys make it possible to select candidates in multiple wavelengths and the resulting sample is more complete. A summary of quasar candidate selection methods employed by previous surveys and our method of Multiwavelength Quasar Survey （MWQS） are presented in Sect.1. Because the most effective way to maximize completeness is to select candidates in multiwavelength, the MWQS has combined data from RASS, UKST, FIRST and NVSS in multiple wavelengths, to greatly reduce selection effects and the survey can produce a quasar sample more complete than that of any previous surveys. The MWQS includes four fields of sky, each covering an area of 6°6°, and blank field sources in all sky. Two of the four survey fields are the rich Leo and Coma clusters and others are F.1002 and F.836. In Sect.2, the candidate selection procedures in three wavelengths are given and the total 211 X-ray candidates in the four fields are obtained. The X-ray candidates of AGNs have been observed in the MWQS by using 2.16-m aperture reflector in Xinglong Station, National Astronomical Observatories, China, and the 2.10-m telescope at Kitt Peak Observatory, USA, to result in the large complete sample of AGNs in four sky areas and Blank Field Sources. The observation of Xray candidates is described in detail. The result of identification is listed in Sect.3. The spectra of 165 AGNs are identified which included 87 AGNs newly discovered. So the MWQS is efficient in discovering AGNs. The objects with special characters have been detected in our MWQS. The prospects aregiven in Sect.4. The selection and observation of optical and

关 键 词：活动星系核 X射线 光学证认 

分 类 号：P157.5[天文地球—天文学]