论文标题
红外类星体的全面视图：最严重遮盖的系统中的恒星形成和无线电排放
A panchromatic view of infrared quasars: excess star formation and radio emission in the most heavily obscured systems
论文作者
论文摘要
要了解活性银河核（AGN）现象及其对星系进化的影响，需要进行完整的AGN人口普查。但是，发现严重遮盖的AGN在观察上具有挑战性。 Here we use the deep and extensive multi-wavelength data in the COSMOS field to select a complete sample of 578 infrared (IR) quasars ($L_{\rm AGN,IR}>10^{45}\rm \: erg\: s^{-1}$) at $z<3$, with minimal obscuration bias, using detailed UV-to-far IR spectral energy distribution （SED）配件。我们通过X射线和无线电观测来补充SED约束，以进一步研究样品的特性。总体而言，Chandra检测到322个IR类星体，并具有单独的X射线光谱限制。 From a combination of X-ray stacking and $L_{\rm 2-10\rm keV}$ - $L_{\rm 6\: μm}$ analyses, we show that the majority of the X-ray faint and undetected quasars are heavily obscured (many are likely Compton thick), highlighting the effectiveness of the mid-IR band to find obscured AGNs.我们发现355（$ \ $ \ $ 61％）被遮盖了（$ n _ {\ rm h}> 10^{22} {22} \ rm \：cm^{ - 2} $），并确定平均属性的差异，而否定的quasars notection notection notection $ nots notection $ nity note Systems for Systems $ the obs obs obs obs obs obs obs obs obs obs obs of the obs obs ob ytive $ y ytive $ ivers $差异3 $ 3恒星质量和（2）遮盖的类星体的无线电发射比未遮挡的系统具有更强的无线电发射功能，带有无线电参数$ \ 0.2 \ rm \：dex $更高。这些结果与一个简单的方向模型不一致，但通常与对被遮盖的类星体的极端宿主 - 山脉晦涩难懂，或者是遮盖的类星体是类星体演变的早期阶段。
To understand the Active Galactic Nuclei (AGN) phenomenon and their impact on the evolution of galaxies, a complete AGN census is required; however, finding heavily obscured AGNs is observationally challenging. Here we use the deep and extensive multi-wavelength data in the COSMOS field to select a complete sample of 578 infrared (IR) quasars ($L_{\rm AGN,IR}>10^{45}\rm \: erg\: s^{-1}$) at $z<3$, with minimal obscuration bias, using detailed UV-to-far IR spectral energy distribution (SED) fitting. We complement our SED constraints with X-ray and radio observations to further investigate the properties of the sample. Overall, 322 of the IR quasars are detected by Chandra and have individual X-ray spectral constraints. From a combination of X-ray stacking and $L_{\rm 2-10\rm keV}$ - $L_{\rm 6\: μm}$ analyses, we show that the majority of the X-ray faint and undetected quasars are heavily obscured (many are likely Compton thick), highlighting the effectiveness of the mid-IR band to find obscured AGNs. We find that 355 ($\approx$61%) IR quasars are obscured ($N_{\rm H}>10^{22}\rm \: cm^{-2}$) and identify differences in the average properties between the obscured and unobscured quasars: (1) obscured quasars have star-formation rates $\approx 3$ times higher than unobscured systems for no significant difference in stellar mass and (2) obscured quasars have stronger radio emission than unobscured systems, with a radio-loudness parameter $\approx 0.2 \rm \: dex$ higher. These results are inconsistent with a simple orientation model but in general agreement with either extreme host-galaxy obscuration towards the obscured quasars or a scenario where obscured quasars are an early phase in the evolution of quasars.
