分离活动星系核及其宿主星系的光学至近红外光
Separating the Optical to Near-Infrared Light of AGN and Their Host Galaxies
- Department of Physics & Astronomy, The University of Western Ontario（韦仕敦大学物理与天文系）
- Institute for Earth & Space Exploration, The University of Western Ontario（韦仕敦大学地球与太空探索研究所）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究利用JWST和HST多波段成像对96个X射线选择的AGN进行Sersic+点源拟合，分离AGN与宿主星系光，并通过CIGALE估计物理性质，发现AGN宿主星系与大规模非AGN星系在恒星质量-恒星形成率平面上一致，且AGN盘光度比符合预期。
AI中文摘要：
活动星系核（AGN）的宿主星系的性质为理解超大质量黑洞吸积的条件提供了线索。星系的形态可以提供关于正在进行的演化过程的重要信息。通过对AGN宿主星系的表面亮度轮廓进行建模，我们可以表征宿主星系的物理性质。利用跨越广泛红移范围的源样本，我们可以研究超大质量黑洞和星系如何随时间演化。应用先前工作的最佳实践，我们使用AstroPhot对Extended Groth Strip中96个X射线选择的AGN在多达13个波段的James Webb Space Telescope和Hubble Space Telescope成像进行了Sersic+点源拟合。我们同时检查参数化（Sersic）和非参数化方法，以最好地确定宿主星系的物理性质。在分离宿主星系和AGN的光之后，我们对测光光谱能量分布进行独立的CIGALE模型拟合，以估计物理性质，包括宿主星系恒星质量和恒星形成率，以及AGN盘光度。在恒星质量-恒星形成率平面上，AGN宿主星系在所有红移下都与对照样本中的大规模非AGN星系对齐。AGN盘光度导致的辐射光度与X射线通量之比在预期范围5-20:1内。我们评估了Sersic建模在获取星系性质方面的局限性，并为使用James Webb Space Telescope成像进行多波段AGN+宿主星系图像分解提供了最佳实践建议。
英文摘要：
The properties of galaxies that host active galactic nuclei (AGNs) offer clues to the conditions that enable accretion onto supermassive black holes. A galaxy's morphology can provide significant information on the evolutionary processes underway. By modeling the surface-brightness profiles of galaxies that host AGN, we can characterize physical properties of the host galaxy. With a sample of sources across a wide range of redshifts, we can investigate how both the supermassive black hole and galaxy evolve over time. Applying the best practices from previous work, we perform Sersic + point source fits of 96 X-ray-selected AGN in the Extended Groth Strip across up to 13 bands of James Webb Space Telescope and Hubble Space Telescope imaging using AstroPhot. We examine both parametric (Sersic) and nonparametric methods in tandem to best determine the physical properties of the host galaxy. After separating the light of the host galaxy and the AGN, we perform independent CIGALE model fits to photometric spectral energy distributions to estimate physical properties including the host galaxy stellar mass and star formation rate, and AGN disk luminosity. In the stellar-mass/star-formation-rate plane, the AGN host galaxies align with the population of massive non-AGN galaxies in the control sample across all redshifts. The AGN disk luminosities result in ratios of bolometric to X-ray flux within the expected range, 5-20:1. We provide an evaluation of the limitations of Sersic modeling to obtain galaxy properties and provide recommendations on best practices for multi-band AGN+host galaxy image decomposition with James Webb Space Telescope imaging.
