论文标题
Lyman $α$发射器的等效宽度在众多穆斯和穆斯
Equivalent widths of Lyman $α$ emitters in MUSE-Wide and MUSE-Deep
论文作者
论文摘要
这项研究的目的是更好地了解Lyman $α$ REST框架等效宽度（ew $ _0 $）和光谱属性以及紫外线（UV）连续形态，通过获得可靠的eW $ _0 $的直方图，以获取星形的统计样本，并评估具有大型对象宽度的统计样本。我们使用了来自Muse的整体场光谱，并结合了Hubble太空望远镜（HST）的广泛带数据来测量EW $ _0 $。我们分析了在整个Muse范围内检测到的（一小时的曝光时间）和Muse-Deep（10小时的暴露时间）调查的$ 1920 $ LYMAN $α$发射器（LAES）的排放线，并在档案HST数据中发现了UV Continuum Continuum对应物。我们使用Galfit软件拟合了UV Continuum光度图像，以获取有关静ul发射的形态学信息，并拟合了从MUSE获得的光谱，以确定双峰分数，不对称，全宽度的一半最大宽度以及Lyman $α$线的通量。这两项调查显示了Lyman $α$ ew $ _0 $的不同直方图。在整个Muse，$ 20 \％$的对象具有EW $ _0> 240 $Å，而这一部分的Muse-Deep仅为$ 11 \％$ $，全部样本的$ \％$ \％$。这包括没有HST Continuum对应物的对象（我们的样本的三分之一），为此我们为EW $ _0 $提供了较低的限制。具有最高安全测量的对象EW $ _0 $具有ew $ _0 = 589 \ pm 193 $Å（最高下限是ew $ _0 = 4464 $Å）。我们研究了EW $ _0 $与Lyman $α$频谱或UV Continuum形态属性之间的联系。在研究EW $ _0 $分布时，必须考虑调查深度。我们发现，通常，高EW $ _0 $对象可以具有广泛的光谱和紫外线形态属性，这可能反映出高EW $ _0 $值的基本原因同样多样化。 （简略）
The aim of this study is to better understand the connection between the Lyman $α$ rest-frame equivalent width (EW$_0$) and spectral properties as well as ultraviolet (UV) continuum morphology by obtaining reliable EW$_0$ histograms for a statistical sample of galaxies and by assessing the fraction of objects with large equivalent widths. We used integral field spectroscopy from MUSE combined with broad-band data from the Hubble Space Telescope (HST) to measure EW$_0$. We analysed the emission lines of $1920$ Lyman $α$ emitters (LAEs) detected in the full MUSE-Wide (one hour exposure time) and MUSE-Deep (ten hour exposure time) surveys and found UV continuum counterparts in archival HST data. We fitted the UV continuum photometric images using the Galfit software to gain morphological information on the rest-UV emission and fitted the spectra obtained from MUSE to determine the double peak fraction, asymmetry, full-width at half maximum, and flux of the Lyman $α$ line. The two surveys show different histograms of Lyman $α$ EW$_0$. In MUSE-Wide, $20\%$ of objects have EW$_0 > 240$ Å, while this fraction is only $11\%$ in MUSE-Deep and $\approx 16\%$ for the full sample. This includes objects without HST continuum counterparts (one-third of our sample), for which we give lower limits for EW$_0$. The object with the highest securely measured EW$_0$ has EW$_0=589 \pm 193$ Å (the highest lower limit being EW$_0=4464$ Å). We investigate the connection between EW$_0$ and Lyman $α$ spectral or UV continuum morphological properties. The survey depth has to be taken into account when studying EW$_0$ distributions. We find that in general, high EW$_0$ objects can have a wide range of spectral and UV morphological properties, which might reflect that the underlying causes for high EW$_0$ values are equally varied. (abridged)
