论文标题
XXL调查。 xli。无线电AGN光度基于GMRT $ 610 \ \ MATHRM {MHz} $ continuum观测值
The XXL Survey. XLI. Radio AGN luminosity functions based on the GMRT $610 \ \mathrm{MHz}$ continuum observations
论文作者
论文摘要
我们使用$ 610 \\ Mathrm {MHz} $无线电调查XXL-NORTH场进行了活性银河核(AGN)的空间密度演变,该调查是通过巨型Metrewave射电望远镜(GMRT)进行的。该调查涵盖了$ 30.4 \ \ \ \ Mathrm {deg}^2 $的面积,横梁的面积为$ 6.5 \ \ \ \ \\ Mathrm {arcsec} $。该调查分为两部分,一部分覆盖$ 11.9 \ \ mathrm {deg}^2 $,$1σ$ rms的噪声为$ 200 \ \ \ \ \ \ \ \ \ \ \ \ \ beam \ beam^{ - 1}}} $,另一个Spanning $ 18.5 \ \ \\\\\\\\\\\\\\\\\\\\\\ Mathrm {deg}^2 $ 45 $ 45 $ 45 \ beam^{ - 1}} $。我们提取了高于$7σ$的无线电组件的目录。该目录与XXL-North字段的多波长目录(覆盖了无线电XXL-North Field的$ 80 \%$ $ $ 80 \%$),使用似然比方法,该方法根据其位置及其光学特性来确定对应物。借助计算机代码,将多组分源以视觉上的匹配:多触及视觉交叉匹配(MCVCM)。磁通量密度在$ 1 \\ mathrm {mjy} $上削减了较高纯度的AGN主机,基于可用的源计数,纯净的纯度。在调查不完整引起的交叉匹配和消除观察性偏见之后,剩余资源的数量为1150美元。我们使用最大音量方法构建了剩下的框架$ 1.4 \\ mathrm {ghz} $无线电光度函数。这项调查使我们能够探测$ 23 \ lyssim \ log(l_ {1.4 \ \ \ \ \ \ \ \ \ \ \ \ \ \ mathrm {ghz}}}}} [\ mathrm {w/hz}])\ lysesim 28 $ 28 $ to $ z \约2.1 $。我们的结果与文献的结果是一致的,在文献中,AGN由两个不同的种群组成,其中光度函数的高光度端比低光度末端更强烈。
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.