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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >SILVERRUSH. III. Deep optical and near-infrared spectroscopy for Lyα and UV-nebular lines of bright Lyα emitters at z?=?6–7
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SILVERRUSH. III. Deep optical and near-infrared spectroscopy for Lyα and UV-nebular lines of bright Lyα emitters at z?=?6–7

机译：银。三，在z？=？6–7时，Lyα和明亮的Lyα发射体的UV星状线的深光学和近红外光谱

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We present Lyα and UV-nebular emission line properties of bright Lyα emitters (LAEs) at z?=?6–7 with a luminosity of log?LLyα/[erg?s?1]?=?43–44 identified in the 21?deg2 area of the SILVERRUSH early sample developed with the Subaru Hyper Suprime-Cam survey data. Our optical spectroscopy newly confirms 21 bright LAEs with clear Lyα emission, and contributes to making a spectroscopic sample of 96 LAEs at z?=?6–7 in SILVERRUSH. From the spectroscopic sample, we select seven remarkable LAEs as bright as Himiko and CR7 objects, and perform deep Keck/MOSFIRE and SubaruuMOIRCS near-infrared spectroscopy reaching the 3?σ flux limit of ～2?×?10?18?erg?s?1 for the UV-nebular emission lines of He?ii?λ1640, C?iv?λλ1548,1550, and O?iii]λλ1661,1666. Except for one tentative detection of C?iv, we find no strong UV-nebular lines down to the flux limit, placing the upper limits of the rest-frame equivalent widths (EW0) of ～2–4?? for C?iv, He?ii, and O?iii]lines. We also investigate the VLT/X-SHOOTER spectrum of CR7 whose 6?σ detection of He?ii is claimed by Sobral et?al. Although two individuals and the ESO archive service carefully reanalyzed the X-SHOOTER data that are used in the study of Sobral et?al., no He?ii signal of CR7 is detected, supportive of weak UV-nebular lines of the bright LAEs even for CR7. The spectral properties of these bright LAEs are thus clearly different from those of faint dropouts at z?～?7 that have strong UV-nebular lines shown in the various studies. Comparing these bright LAEs and the faint dropouts, we find anti-correlations between the UV-nebular line EW0 and the UV-continuum luminosity, which are similar to those found at z?～?2–3.
机译：我们提出了在z？=？6–7处发光度为log？LLyα/ [erg？s？1]？=？43–44的明亮Lyα发射体（LAE）的Lyα和UV星状发射线特性。利用Subaru Hyper Suprime-Cam调查数据开发了SILVERRUSH早期样本的deg2面积。我们的光谱学新近证实了21个明亮的LAE，并具有清晰的Lyα发射，并有助于在银质光谱中以z？=？6–7制备96个LAE的光谱样品。从光谱样本中，我们选择了7个与Himiko和CR7物体一样明亮的LAE，并执行了深Keck / MOSFIRE和Subaru / nuMOIRCS近红外光谱，达到了3？σ的光通量极限，约为2？×？10？18？erg。 He iiλ1640，C ivλλλ1548,1550和O iiiλλ1661,1666的紫外星状发射线的λsλ1。除了对C？iv的一种初步检测外，我们没有发现到通量极限以下的强UV紫外线线，其余帧等效宽度（EW0）的上限约为2-4。 C？iv，He？ii和O？iii]行。我们还研究了Sobral等人声称其He？ii的6σ检出的CR7的VLT / X-SHOOTER光谱。尽管有两个人和ESO存档服务仔细地重新分析了Sobral等人研究中使用的X-SHOOTER数据，但未检测到CR7的He？ii信号，甚至支持了明亮LAE的弱UV针状线。对于CR7。因此，这些明亮的LAE的光谱特性与z？〜？7处的微弱落差明显不同，在各种研究中，这些微弱的落差具有强烈的UV星状线。比较这些明亮的LAE和微弱的辍学现象，我们发现UV星状线EW0和UV连续谱的光度之间存在反相关关系，这与z？〜？2-3处的相似。

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