论文标题
$ z \ y y $ z \ y y $ \ sim $ \ sim $ 1.2度$^2 $的光谱调查
A Spectroscopic Survey of Ly$α$ Emitters at $z\approx3.1$ over $\sim$1.2 Deg$^2$
论文作者
论文摘要
我们在Subaru MM-Newton Deep Reverion Field中对Ly $α$发射器（LAES）进行了光谱调查。该领域具有一系列宽和窄带的深度成像数据，包括两个相邻的窄带NB497和NB503，这些频带使我们能够在$ z \ of 3.1 $中有效地选择LAE候选者。使用对MMT Hectospec和Magellan M2FS的光谱观测，我们在$ \ s $ \ sim $ 1.2度$^2 $上获得了166个Laes的样本，其中包括16个先前已知的Laes。到目前为止，这是该红移时最大的LAE样品（通过光谱确认的）样本。我们利用安全的红移和多波段数据来测量光谱属性，例如ly $α$亮度和REST-FRAME UV坡度。我们得出了一个可靠的$α$光度功能（LF），该功能跨度从$ \ sim10^{42.0} $到$> 10^{43.5} $ erg S $^{ - 1} $。在我们的样品中检测到了明显的过度密度和不足区域，但是该面积覆盖范围足够宽，可以在很大程度上抑制这种宇宙方差的影响。我们的$α$ lf通常与以前研究的$ z \ sim 3.1 $一致。在LF的最亮端，有一个暂定的检测密度过量，而Schechter函数并未很好地描述。与其他红移的LFS的比较表明，Ly $α$ LF在$ 2 <z <5 $中并未显示出明显的进化。最后，我们构建了LAE的复合光谱，并以$ \ sim4σ$的显着性检测NVI和CIV Doublet发射线，这表明（其中一些）LAE中的非常硬的辐射场。
We present a spectroscopic survey of Ly$α$ emitters (LAEs) at $z\approx3.1$ in the Subaru MM-Newton Deep Survey Field. This field has deep imaging data in a series of broad and narrow bands, including two adjacent narrow bands NB497 and NB503 that have allowed us to efficiently select LAE candidates at $z\approx3.1$. Using spectroscopic observations on MMT Hectospec and Magellan M2FS, we obtained a sample of 166 LAEs at $z\approx3.1$ over an effective area of $\sim$1.2 deg$^2$, including 16 previously known LAEs. This is so far the largest (spectroscopically confirmed) sample of LAEs at this redshift. We make use of the secure redshifts and multi-band data to measure spectral properties such as Ly$α$ luminosity and rest-frame UV slope. We derive a robust Ly$α$ luminosity function (LF) that spans a luminosity range from $\sim10^{42.0}$ to $>10^{43.5}$ erg s$^{-1}$. Significant overdense and underdense regions are detected in our sample, but the area coverage is wide enough to largely suppress the effect from such cosmic variance. Our Ly$α$ LF is generally consistent with those from previous studies at $z \sim 3.1$. At the brightest end of the LF, there is a tentative detection of a density excess that is not well described by the Schechter function. The comparison with the LFs at other redshifts suggests that the Ly$α$ LF does not show significant evolution at $2<z<5$. Finally, we build the composite spectra of the LAEs and detect the NVI and CIV doublet emission lines at significance of $\sim 4 σ$, suggesting very hard radiation fields in (some of) these LAEs.
