ROXA：一个新的多频选择的blazar大样本的SDSS和2dF光谱
ROXA: a new multi-frequency selected large sample of blazars with SDSS and 2dF optical spectroscopy
摘要：
上下文虽然耀变体在整个活动星系核中只占一小部分，但它们被认为是硬X射线和伽马射线波段的河外源的主要来源，并且已被证明是CMB波动图的最大污染物。到目前为止，已知的耀变体的数量大约有几百个，但即将建成的AGILE、GLAST和普朗克空间天文台将探测到几千个这类天体。目标。为了准备这些任务，有必要确定新的耀变体样本，以研究其多频率特性和统计特性。方法.我们使用SDSS-DR 4和2dF测量数据，通过大射电（NVSS，ATCAPMN）和X射线测量（RASS）之间的互相关编译了一个具有耀变体性质的天体样本，以光谱方式识别我们的候选者并测试选择方法的有效性。结果本文介绍了ASDC（ROXA）建立的射电-光学-X射线星表，包括816个天体，其中510个是已确认的耀变体。只有19%的候选者被证明肯定是非耀变体，这证明了我们的选择方法的高效率。结论.我们的目录包括173个新的耀变体，约占目前已知耀变体的10%。相对较高的通量阈值在X射线能量带（由RASS调查）优先选择对象与高fx / fr比，导致新的高能量峰值BL Lac（HBLs）的发现。因此，我们的目录包括许多新的潜在目标的GeV-TeV观测。
英文摘要：
Context. Although Blazars are a small fraction of the overall AGN population they are expected to be the dominant population of extragalactic sources in the hard X-ray and gamma-ray bands and have been shown to be the largest contaminant of CMB fluctuation maps. So far the number of known blazars is of the order of several hundreds, but the forthcoming AGILE, GLAST and Planck space observatories will detect several thousand of objects of this type. Aims. In preparation for these missions it is necessary to identify new samples of blazars to study their multi-frequency characteristics and statistical properties. Methods. We compiled a sample of objects with blazar-like properties via a cross-correlation between large radio (NVSS, ATCAPMN) and X- ray surveys (RASS) using the SDSS-DR4 and 2dF survey data to spectroscopically identify our candidates and test the validity of the selection method. Results. We present the Radio - Optical - X-ray catalog built at ASDC (ROXA), a list of 816 objects among which 510 are confirmed blazars. Only 19% of the candidates turned out to be certainly non-blazars demonstrating the high efficiency of our selection method. Conclusions. Our catalog includes 173 new blazar identifications, or about 10% of all presently known blazars. The relatively high flux threshold in the X-ray energy band (given by the RASS survey) preferentially selects objects with high fx / fr ratio leading to the discovery of new High Energy Peaked BL Lac (HBLs). Our catalog therefore includes many new potential targets for GeV-TeV observations.
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