论文标题
在宇宙调查中，被遮盖和未遮挡的X射线选定的活性银河核的宿主星系性能和环境
Host galaxy properties and environment of obscured and unobscured X-ray selected Active Galactic Nuclei in the COSMOS survey
论文作者
论文摘要
我们分析了由中IIR幂律和COSMOS调查中的X射线发射选择的活性银河核（AGN）和类星体（QSO）的不同光度和光谱特性。我们使用一组恒星形成星系作为对照样品与结果进行比较。我们考虑了被遮盖的样本（HR> -0.2）和UNOBSCURED（HR <-0.2）来源，包括$ L_X $ <$ 10^{44} $ erg S $^{ - 1} $的AGN，以及qsos（$ l_x $> $ 10^$> $ 10^{44} $ erg s $ erg s $^z $^Z <2.14}。我们还通过评估邻近的星系数密度和邻居特性，例如颜色，恒星质量和恒星形成速率来研究这些样品的典型环境。我们发现，不同AGN类型的UV/光学和中红外颜色分布有很大差异。同样，与SF星系样品相比，我们获得的大部分AGN和QSO都更加紧凑。通常，我们发现不同AGN样本的恒星质量分布相似，仅获得$δ\叠加{\ MathRM {log} m} = 0.3 $ dex（$ m _ {\ odot} $）之间的差异和遮盖QSO之间的差异。遮盖和毫不掩饰的AGN和QSO位于小的本地环境中（$ r_p $ <100 kpc）尺度。我们的结果支持以前的发现，而AGN类型与环境相关。这些差异以及AGN宿主特性中发现的差异赋予了掩饰纯粹是方向效应的最简单的统一模型。
We analyse different photometric and spectroscopic properties of active galactic nuclei (AGNs) and quasars (QSOs) selected by their mid-IR power-law and X-ray emission from the COSMOS survey. We use a set of star-forming galaxies as a control sample to compare with the results. We have considered samples of obscured (HR > -0.2) and unobscured (HR < -0.2) sources including AGNs with $L_X$ < $10^{44}$ erg s$^{-1}$, as well as QSOs ($L_X$ > $10^{44}$ erg s$^{-1}$) with 1.4 < z < 2.5. We also study the typical environment of these samples, by assessing neighbouring galaxy number density and neighbour properties such as colour, stellar mass and star formation rate. We find that the UV/optical and mid-infrared colour distribution of the different AGN types differ significantly. Also, we obtain most of AGNs and QSOs to be more compact when compared to the sample of SF galaxies. In general we find that the stellar mass distribution of the different AGN sample are similar, obtaining only a difference of $Δ\overline{\mathrm{log}M}=0.3$ dex ($M_{\odot}$) between unobscured and obscured QSOs. Obscured and unobscured AGNs and QSOs reside in different local environment at small ($r_p$ < 100 kpc) scales. Our results support previous findings where AGN type correlates with environment. These differences and those found in AGN host properties cast out the simplest unified model in which obscuration is purely an orientation effect.
