XXL调查。XLI。基于GMRT $610 \ \mathrm{MHz}$连续观测的射电AGN光度函数
The XXL Survey. XLI. Radio AGN luminosity functions based on the GMRT $610 \ \mathrm{MHz}$ continuum observations
摘要：
我们研究了活动星系核（AGN）的空间密度演化使用的$610 \ \mathrm{MHz}$无线电调查的XXL北领域，与巨型米波射电望远镜（GMRT）进行。勘测范围为$30.4 \ \mathrm{deg}^2$，波束尺寸为$6.5 \ \mathrm{arcsec}$。调查分为两部分，一部分覆盖$11.9 \ \mathrm{deg}^2$区域，$1 σ$均方根噪声为$200\ \mathrm{μJy \ beam^{-1}}$，另一部分覆盖$18.5 \ \mathrm{deg}^2$区域，均方根噪声为$45\ \mathrm{μJy \ beam^{-1}}$。我们提取了$7 σ$上面的无线电组件目录。使用似然比方法将该目录与XXL北场的多波长目录（覆盖无线电XXL北场的$80 \%$）进行交叉匹配，该方法根据其位置和光学特性确定对应物。借助于计算机代码：多目录视觉交叉匹配（MCVCM），对多组分源进行视觉匹配。在$1\ \mathrm{mJy}$之上的通量密度切割选择了根据可用的源计数在恒星形成污染方面具有高纯度的活动星系核宿主。在交叉匹配和消除由调查不完整性引起的观察偏差后，剩余的来源数量为$1150$。我们使用最大体积法构造了这些源的静止坐标系$1.4 \ \mathrm{GHz}$射电光度函数。这项调查使我们能够探测亮度的$ 23 \lesssim \log(L_{1.4 \ \mathrm{GHz}}[\mathrm{W/Hz}]) \lesssim 28$的红移$z \approx 2.1$。我们的结果是一致的结果从文献中AGN是由两个不同的演变人口，其中高光度端的光度函数的演变更强烈的比低光度端。
英文摘要：
We study the space density evolution of active galactic nuclei (AGN) using the $610 \ \mathrm{MHz}$ radio survey of the XXL-North field, performed with the Giant Metrewave Radio Telescope (GMRT). The survey covers an area of $30.4 \ \mathrm{deg}^2$, with a beamsize of $6.5 \ \mathrm{arcsec}$. The survey is divided into two parts, one covering an area of $11.9 \ \mathrm{deg}^2$ with $1 σ$ rms noise of $200\ \mathrm{μJy \ beam^{-1}}$ and the other spanning $18.5 \ \mathrm{deg}^2$ with rms noise of $45\ \mathrm{μJy \ beam^{-1}}$. We extracted the catalog of radio components above $7 σ$. The catalog was cross-matched with a multi-wavelength catalog of the XXL-North field (covering about $80 \%$ of the radio XXL-North field) using a likelihood ratio method, which determines the counterparts based on their positions and their optical properties. The multi-component sources were matched visually with the aid of a computer code: Multi-Catalog Visual Cross-Matching (MCVCM). A flux density cut above $1\ \mathrm{mJy}$ selects AGN hosts with a high purity in terms of star formation contamination based on the available source counts. After cross-matching and elimination of observational biases arising from survey incompletenesses, the number of remaining sources was $1150$. We constructed the rest-frame $1.4 \ \mathrm{GHz}$ radio luminosity functions of these sources using the maximum volume method. This survey allows us to probe luminosities of $ 23 \lesssim \log(L_{1.4 \ \mathrm{GHz}}[\mathrm{W/Hz}]) \lesssim 28$ up to redshifts of $z \approx 2.1$. Our results are consistent with the results from the literature in which AGN are comprised of two differently evolving populations, where the high luminosity end of the luminosity functions evolves more strongly than the low-luminosity end.
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