论文标题
在$ z \ sim 0.6-1.2 $的星系的紫外线光度功能的明亮端
On the bright-end of the UV luminosity functions of galaxies at $z \sim 0.6-1.2$
论文作者
论文摘要
我们在Redshift范围内的星形星系$ z = 0.6-1.2 $，在其余框架远处（$ 1500 $Å）波长中得出了恒星形成星系的超紫（UV）光度函数（LF）。对于这项工作，我们特别对在此红移范围内的UV LF的明亮末端感兴趣。用于此目的，来自XMM-Newton光学监视器（XMM-OM），近欧特维罗莱特（$ 2410-3565 $Å）的观测值超过1.5平方cosmos字段。我们将$ 879 $源的源列表与$ uvw1_ \ mathrm {ab} $在$ \ sim 21-24 $ mags中的范围内从两个垃圾桶中的宽区UVW1图像中汇编成$ \ sim 21-24 $ mags，$ 0.6 \ leq z \ leq z \ leq 0.8 $和$ 0.8 $和0.8 \ leq z \ leq z \ leq z \ leq z \ leq leq leq leq leq leq 1.2 $。这些来源的$ m_ {1500} $在于间隔$ [ - 19.10，-22.50] $。我们使用最大可能性将Schechter函数模型拟合到未键数据的数据中，以估算Schechter函数的参数（微弱的端斜率，特征幅度和归一化）。我们发现LF的形状与Schechter模型是一致的，并且参数与使用$ 1500 $ÅFlux进行的其他研究进行了公平的一致。当我们从较低（$ 0.7 $）移动到更高（$ 1.0 $）的红移时，我们看到了特征幅度的亮度。亮度密度的度量在过去研究的误差范围内。我们检查样品中最亮的来源是否有AGN的贡献。这些来源的特征在于它们的光谱能量分布，综合红外发光性和形态。我们还探索了它们与类似的红移范围内最明亮的IR星系的重叠。
We derive the Ultra-Violet (UV) luminosity function (LF) of star-forming galaxies in the redshift range $z = 0.6 - 1.2$, in the rest-frame far-UV ($1500$ Å) wavelength. For this work, we are in particular interested in the bright end of the UV LF in this redshift range. Data from the XMM-Newton Optical Monitor (XMM-OM), near-ultraviolet ($2410-3565$ Å) observations over 1.5 sq. deg of the COSMOS field are employed for this purpose. We compile a source-list of $879$ sources with $UVW1_\mathrm{AB}$ in the range $\sim 21-24$ mags from the wide-area UVW1 image of the COSMOS field in the two bins $0.6 \leq z \leq 0.8$ and $0.8 \leq z \leq 1.2$. The $M_{1500}$ for these sources lies in the interval $[-19.10,-22.50]$. We use the maximum likelihood to fit a Schechter function model to the un-binned data to estimate the parameters (faint-end slope, characteristic magnitude, and normalisation) of the Schechter function. We find the shape of the LF to be consistent with the Schechter model, and the parameters are in fair agreement with other studies conducted using direct measurements of the $1500$Å flux. We see a brightening of the characteristic magnitude as we move from lower ($0.7$) to higher ($1.0$) redshift. The measures for luminosity density are within the error margins of past studies. We examine the brightest sources in our sample for the AGN contribution. These sources are characterised by their spectral energy distributions, integrated infrared luminosities, and morphologies. We also explore their overlap with the brightest IR galaxies in a similar redshift range.
