牧夫座中射电巨响高红移原星系候选者
Radio-loud high-redshift protogalaxy candidates in Bootes
摘要：
我们使用近红外相机Keck I获得KS波段图像的四个候选高红移射电星系选择使用光学和无线电数据在NOAO深宽视场巡天在牧夫座。我们的目标有1.4 GHz的无线电通量密度大于1 mJy，但未被检测到的光学比24织女星mag. Spectral能量分布拟合表明，这些对象中的三个是在z > 3，与无线电光度附近的FR-I / FR-II突破。另一颗的光度红移为1.2，但实际上可能有更高的红移。四个天体中有两个在Ks波段呈现弥散形态，表明它们仍处于形成过程中。
英文摘要：
We used the Near Infrared Camera on Keck I to obtain Ks-band images of four candidate high-redshift radio galaxies selected using optical and radio data in the NOAO Deep Wide-Field Survey in Bootes. Our targets have 1.4 GHz radio flux densities greater than 1 mJy, but are undetected in the optical to fainter than 24 Vega mag. Spectral energy distribution fitting suggests that three of these objects are at z > 3, with radio luminosities near the FR-I / FR-II break. The other has photometric redshift 1.2, but may in fact be at higher redshift. Two of the four objects exhibit diffuse morphologies in Ks -band, suggesting that they are still in the process of forming.
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