UKIDSS-DXS XMM-LSS场中射电源的演化
The evolution of radio sources in the UKIDSS-DXS XMM-LSS field
摘要：
研究了XMM大尺度结构巡天（XMM-LSS）中低光度（$L_{\rm{1.4GHz}}<10^{25}\rm{W~Hz^{-1}sr^{-1}}$）射电源的宇宙演化。我们匹配低频率（610 MHz）的无线电源在XMM-LSS字段与近红外$K$波段的观测在同一领域从UKIRT红外深空调查。我们使用的平均$V/V_{\rm{max}}$统计和这些匹配的源的无线电光度函数来量化我们的样本中的低光度射电源的同向运动空间密度的演变。我们的研究结果表明，低光度源的发展不同，他们的高光度对应的红移z $\sim$ 0.8。导出的光度函数与低光度源的同向移动空间密度在z=0.8时增加$\sim$ 1.5倍是一致的。我们表明，使用的$K-z$图的射电源人口，虽然粗糙比一个完整的光度红移分析，产生一致的结果与以前的研究使用$\sim >10$波段光度。这为在未来的近红外和中红外巡天中对整个天空进行类似的分析提供了一种很有前途的方法。
英文摘要：
We investigate the cosmic evolution of low luminosity ($L_{\rm{1.4GHz}}<10^{25}\rm{W~Hz^{-1}sr^{-1}}$) radio sources in the XMM Large Scale Structure survey field (XMM-LSS). We match low frequency selected (610~MHz) radio sources in the XMM-LSS field with near infrared $K$-band observations over the same field from the UKIRT Infrared Deep Sky Survey. We use both the mean $V/V_{\rm{max}}$ statistic and the radio luminosity function of these matched sources to quantify the evolution of the co-moving space density of the low luminosity radio sources in our sample. Our results indicate that the low luminosity sources evolve differently to their high luminosity counterparts out to a redshift of z$\sim$0.8. The derived luminosity function is consistent with an increase in the co-moving space density of low luminosity sources by a factor of $\sim$1.5 at z=0.8. We show that the use of the $K-z$ diagram for the radio source population, although coarser than a full photometric redshift analysis, produces consistent results with previous studies using $\sim >10$ band photometry. This offers a promising method for conducting similar analyses over the whole sky with future near- and mid-infrared surveys.
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