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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >The Subaru Deep Field project: Lyman alpha emitters at a redshift of 6.6
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The Subaru Deep Field project: Lyman alpha emitters at a redshift of 6.6

机译：Subaru Deep Field项目：Lyman alpha发射器的红移为6.6

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摘要

We present new results of a deep optical imaging survey using a narrow band filter (NB921) centered at lambda = 9196 angstrom together with B, V, R, i', and z' broadband filters in the sky area of the Subaru Deep Field, which has been promoted as one of legacy programs of the 8.2 m Subaru Telescope. We obtained a photometric sample of 58 Ly alpha emitter candidates at z approximate to 6.5-6.6 among similar to 180 strong NB921-excess (z' - NB921 > 1.0) objects together with a color criterion of i' - z' > 1.3. We then obtained optical spectra of 20 objects in our NB921-excess sample, and identified at least nine Ly alpha emitters at z similar to 6.5-6.6, including the two emitters reported by Kodaira et al. (2003, PASJ, 55, L17). Since our Ly alpha-emitter candidates are free from strong amplification of gravitational lensing, we are able to discuss their observational properties from a statistical point of view. Based on these new results, we obtained a lower limit of the star-formation rate density of rho(SFR) similar or equal to 5.7 x 10(-4) h(0.7) M-circle dot yr(-1) Mpc(-3) at z approximate to 6.6, being consistent with our previous estimate. We discuss the nature of star-formation activity in galaxies beyond z = 6.
机译：我们展示了使用斯巴鲁深场天空区域中以λ= 9196埃为中心的窄带滤光片（NB921）以及B，V，R，i'和z'宽带滤光片进行的深光学成像调查的新结果，它已被推广为8.2 m斯巴鲁望远镜的遗留程序之一。我们在类似于180个强NB921-过量（z'-NB921> 1.0）对象以及i'-z'> 1.3的颜色标准之间，在z处近似于6.5-6.6的位置获得了58个Lyα发射体候选物的光度学样本。然后，我们获得了NB921过量样品中20个物体的光谱，并在与6.5-6.6相似的z处识别了至少9个Ly alpha发射体，其中包括Kodaira等人报道的两个发射体。 （2003，PASJ，55，L17）。由于我们的Lyα-发射极候选物没有重力透镜的强烈放大，因此我们能够从统计学的角度讨论它们的观测特性。基于这些新结果，我们获得了rho（SFR）的恒星形成速率密度的下限，该密度近似或等于5.7 x 10（-4）h（0.7）M圆点yr（-1）Mpc（- 3）在z处大约为6.6，与我们之前的估计一致。我们讨论超过z = 6的星系中恒星形成活动的性质。

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