AI 中文总结
该研究利用JWST的SMILES和JADES，通过多波长SED拟合识别0<z<6的278个被遮挡AGN，发现AGN红外贡献和数量分数随红移增加，对总红外光度依赖性小，突出了JWST揭示隐藏AGN群体及为AGN-星系共演化提供新限制的能力。
AI 中文摘要
活动星系核（AGN）是星系演化的关键驱动因素，但由于严重的尘埃遮挡，许多AGN在紫外和光学巡天中仍未被发现。在这些系统中，吸收的辐射在红外（IR）波长重新辐射，这使得红外观测对于识别完整的AGN群体至关重要。追踪AGN的红外贡献和数量分数有助于深入了解AGN活动在宇宙时间中的主导地位和普遍性。利用詹姆斯·韦布空间望远镜系统中红外仪器遗产星系外巡天（SMILES）和詹姆斯·韦布空间望远镜深度星系外高级巡天（JADES），我们利用 GOODS-S 场中连续的光学到中红外覆盖（0.4-25μm），通过使用 CIGALE 进行多波长SED拟合来识别被遮挡的AGN。我们的样本包括0<z<6范围内的278个AGN，由于SMILES中红外成像仪更大的15点观测区域，相对于之前利用宇宙演化早期发布科学（CEERS）巡天的研究，样本量增加了七倍。我们发现，AGN的红外贡献和数量分数都随着红移增加，AGN分数从z<2时的约5%上升到更高红移时的约30%，而AGN贡献的中位数增加了约0.15。相比之下，作为总红外光度在log(L/L⊙)≈8-12范围内的函数，AGN贡献和AGN数量分数基本保持不变。这些趋势表明，被遮挡的AGN活动的普遍性取决于红移，而对总红外光度几乎没有依赖性。我们的结果突出了詹姆斯·韦布空间望远镜揭示以前隐藏的AGN群体的能力，并为AGN-星系共同演化提供了新的限制。
英文摘要
Active galactic nuclei (AGN) are key drivers of galaxy evolution, yet many remain undetected in ultraviolet and optical surveys due to heavy dust obscuration. In these systems, absorbed emission is re-radiated at infrared (IR) wavelengths, making IR observations essential for identifying the full AGN population. Tracking the AGN IR contribution and number fraction provides insight into both the dominance and prevalence of AGN activity across cosmic time. Using the JWST Systematic Mid-infrared Instrument Legacy Extragalactic Survey (SMILES) and the JWST Advanced Deep Extragalactic Survey (JADES), we leverage continuous optical-to-mid-IR coverage (0.4-25 $μ$m) in the GOODS-S field to identify obscured AGN via multi-wavelength SED fitting with CIGALE. Our sample includes 278 AGN across 0 < z < 6, representing a seven-fold increase in sample size relative to previous studies utilizing the Cosmic Evolution Early Release Science (CEERS) survey due to the larger 15-pointing SMILES MIRI footprint. We find that both AGN IR contribution and number fraction increase with redshift, with AGN fractions rising from $\lesssim$ 5% at z < 2 to ~ 30% at higher redshifts, while the median AGN contribution increases by up to ~ 0.15. In contrast, as a function of total IR luminosity over $\log(L/L_{\odot}) \approx$ 8 - 12, the AGN contribution and AGN number fraction remain fundamentally static. These trends suggest that the prevalence of obscured AGN activity is dependent on redshift while showing little to no dependence on total infrared luminosity. Our results highlight JWST's ability to uncover previously hidden AGN populations and provide new constraints on AGN-galaxy co-evolution.
