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首页> 外文期刊>The Astrophysical Journal. Supplement Series >THE HIGH A(V) QUASAR SURVEY: REDDENED QUASI-STELLAR OBJECTS SELECTED FROM OPTICAL/NEAR-INFRARED PHOTOMETRY. II.
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THE HIGH A(V) QUASAR SURVEY: REDDENED QUASI-STELLAR OBJECTS SELECTED FROM OPTICAL/NEAR-INFRARED PHOTOMETRY. II.

机译：高A（V）准SAR调查：从光学/近红外光度法中选择的偏红色准星状物体。二。

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摘要

Quasi-stellar objects (QSOs) whose spectral energy distributions (SEDs) are reddened by dust either in their host galaxies or in intervening absorber galaxies are to a large degree missed by optical color selection criteria like the ones used by the Sloan Digital Sky Survey (SDSS). To overcome this bias against red QSOs, we employ a combined optical and near-infrared (near-IR) color selection. In this paper, we present a spectroscopic follow-up campaign of a sample of red candidate QSOs which were selected from the SDSS and the UKIRT Infrared Deep Sky Survey (UKIDSS). The spectroscopic data and SDSS/UKIDSS photometry are supplemented by mid-infrared photometry from the Wide-field Infrared Survey Explorer. In our sample of 159 candidates, 154 (97%) are confirmed to be QSOs. We use a statistical algorithm to identify sightlines with plausible intervening absorption systems and identify nine such cases assuming dust in the absorber similar to Large Magellanic Cloud sightlines. We find absorption systems toward 30 QSOs, 2 of which are consistent with the best-fit absorber redshift from the statistical modeling. Furthermore, we observe a broad range in SED properties of the QSOs as probed by the rest-frame 2 mu m flux. We find QSOs with a strong excess as well as QSOs with a large deficit at rest-frame 2 mu m relative to a QSO template. Potential solutions to these discrepancies are discussed. Overall, our study demonstrates the high efficiency of the opticalear-IR selection of red QSOs.
机译：其光谱能量分布（SED）在其主星系或居间的吸收星系中被灰尘变红的准星体（QSO）在很大程度上被光学选色标准所遗漏，例如斯隆数字天空调查（Sloan Digital Sky Survey）使用的标准SDSS）。为了克服对红色QSO的偏见，我们采用了光学和近红外（近红外）颜色选择的组合。在本文中，我们介绍了从SDSS和UKIRT红外深空调查（UKIDSS）中选出的红色候选QSO的光谱跟踪活动。光谱数据和SDSS / UKIDSS测光补充了广域红外勘测浏览器的中红外测光。在我们的159个候选人样本中，有154个（97％）被确认为QSO。我们使用一种统计算法来识别具有合理的介入吸收系统的视线，并假定与大型麦哲伦星云视线相似的吸收器中的灰尘，确定了九种此类情况。我们发现有30个QSO的吸收系统，其中2个与统计模型中最适合的吸收器红移一致。此外，我们观察到QSO的SED特性范围很广，如其余帧2μm的流量所探测到的。我们发现，相对于QSO模板，在剩余帧2μm处，QSO的剩余量很强，而QSO的缺陷量很大。讨论了解决这些差异的方法。总的来说，我们的研究表明红色QSO的光学/近红外选择效率很高。

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