论文标题
低频无线电AGN人口的演变至$ z \ simeq 1.5 $在Elais N1字段中
The Evolution of the Low-Frequency Radio AGN Population to $z\simeq 1.5$ in the ELAIS N1 Field
论文作者
论文摘要
我们使用GMRT 610 MHz的调查涵盖$ \ sim $ \ sim $ 1.86度$^2 $ ELAIS N1领域的宇宙进化至$ Z \ simeq 1.5 $，并具有最小/中位数RMS噪声7.1/19.5 \，$ $ jy/$ $ Jy/beam/beam and Beam and Beam and Beam and Beam and Beam and angular of Angular of Angular of 6 6 \，arcssecs。我们使用多波长诊断的组合将源分类为恒星形成星系（SFGS），无线电定价（RQ）和Radio-Loud（RL）主动银河系核（AGN），并找到支持SFGS和RQ AGN的证据，而不是由AGN形成的RQ AGN而不是AGN-AGN产生。但是，在高亮度下，在比较无线电和红外恒星形成速率时，SFGS和RQ AGN都显示出无线电的过量。我们的绝大多数样本都沿着$ \ rm {sfr -m _ {\ star}} $“主序列”在所有红移时都使用红外星形形成率。我们得出了总AGN种群的610 MHz无线电光度函数，通过连续的纯密度和纯光度演变的模型以$ \ rm {φ^{φ^{\ star} \，\ propto \，（\，（\，1+\，z）^{（2.25 \ pm0.38） - pm0.638） - （0.63） - （0.63） - （0.63） - （ $ \ rm {l_ {610 \，mhz} \，\ propto \，（\，1+\，z）^{（3.45 \ pm0.53） - （分别为0.55 \ pm0.29）z}}} $。对于我们的RQ和RL AGN，我们找到了一个相当温和的进化，红移最适合纯亮度进化，$ \ rm {l_ {610 \，MHz} \，\，\ propto \，（\，1+\，z）^{（2.81 \ pm0.43） $ \ rm {l_ {610 \，MHz} \，\ propto \，（\，1+\，z）^{（3.58 \ pm0.54） - （0.56 \ pm0.29）$ agn。因此，610 MHz无线电AGN种群包括两个不同不断发展的人群，它们的无线电发射大多是由SF驱动或AGN驱动的。
We study the cosmic evolution of radio sources out to $z \simeq 1.5$ using a GMRT 610 MHz survey covering $\sim$1.86 deg$^2$ of the ELAIS N1 field with a minimum/median rms noise 7.1/19.5\,$μ$Jy / beam and an angular resolution of 6\,arcsec. We classify sources as star forming galaxies (SFGs), radio-quiet (RQ) and radio-loud (RL) Active Galactic Nuclei (AGN) using a combination of multi-wavelength diagnostics and find evidence in support of the radio emission in SFGs and RQ AGN arising from star formation, rather than AGN-related processes. At high luminosities, however, both SFGs and RQ AGN display a radio excess when comparing radio and infrared star formation rates. The vast majority of our sample lie along the $\rm{SFR - M_{\star}}$ "main sequence" at all redshifts when using infrared star formation rates. We derive the 610 MHz radio luminosity function for the total AGN population, constraining its evolution via continuous models of pure density and pure luminosity evolution with $\rm{Φ^{\star}\,\propto\,(\,1+\,z)^{(2.25\pm0.38)-(0.63\pm0.35)z}}$ and $\rm{L_{610\,MHz}\,\propto\,(\,1+\,z)^{(3.45\pm0.53)-(0.55\pm0.29)z}}$ respectively. For our RQ and RL AGN, we find a fairly mild evolution with redshift best fitted by pure luminosity evolution with $\rm{L_{610\,MHz}\,\propto\,(\,1+\,z)^{(2.81\pm0.43)-(0.57\pm0.30)z}}$ for RQ AGN and $\rm{L_{610\,MHz}\,\propto\,(\,1+\,z)^{(3.58\pm0.54)-(0.56\pm0.29)z}}$ for RL AGN. The 610 MHz radio AGN population thus comprises two differently evolving populations whose radio emission is mostly SF-driven or AGN-driven respectively.
