BASS. XLIII：未被遮蔽的Swift/BAT活动星系核的光学、紫外和X射线发射性质
BASS. XLIII: Optical, UV, and X-ray emission properties of unobscured Swift/BAT active galactic nuclei
AI总结：
本研究基于Swift/BAT 70个月星表，构建236个本地未被遮蔽AGN的多波段SED，测量热光度、光谱指数及热修正，发现紫外BC随光度与爱丁顿比率增加，并给出2-10 keV BC与α_ox的回归关系以估算热光度。
摘要：
我们展示了本地宇宙中未被遮蔽的活动星系核（AGN）的同时光学至X射线光谱能量分布（SEDs）的最大多波段研究之一。利用来自70个月Swift/BAT星表的硬X射线选择的AGN代表性样本，结合Swift/UVOT的光学/紫外光度数据和Swift/XRT的X射线光谱数据，我们构建了236个邻近AGN（0.001<z<0.3）的宽带SED。我们使用GALFIT来估计光学/紫外中的宿主星系污染，并确定内在的AGN通量。我们使用带有反射分量的吸收幂律来建模X射线光谱，并使用尘埃红化的多温度黑体来拟合光学/紫外SED。我们计算了总热光度（$L_{bol}$）、光学至X射线光谱指数（$α_{ox}$）以及光学、紫外和X射线中的多个热修正（BCs）。我们使用由反响映射和维里方法获得的黑洞质量来估计我们所有AGN的爱丁顿比率（$λ_{Edd}$）。我们确认了样本中紫外和X射线光度之间的紧密相关性。我们观察到$α_{ox}$随$L_{bol}$和$λ_{Edd}$显著下降，表明更亮的源每X射线发射更多的紫外光子。我们报告了2-10 keV BC与$α_{ox}$之间的二阶回归关系，这在缺乏多波段SED时可用于计算$L_{bol}$。我们还研究了光学/紫外BC对AGN物理性质的依赖性，并发现紫外BC随$L_{bol}$和$λ_{Edd}$显著增加，而光学BC在$L_{bol}$和$λ_{Edd}$的五个数量级范围内保持不变。我们在所有BC中获得了显著的离散度（约0.1-1 dex），因此建议使用与观测量相关的适当关系并包含所报告的离散度，而不是使用它们的中值。
英文摘要：
We present one of the largest multiwavelength studies of simultaneous optical-to-X-ray spectral energy distributions (SEDs) of unobscured active galactic nuclei (AGN) in the local Universe. Using a representative sample of hard-X-ray-selected AGN from the 70-month Swift/BAT catalog, with optical/UV photometric data from Swift/UVOT and X-ray spectral data from Swift/XRT, we constructed broadband SEDs of 236 nearby AGN (0.001<z<0.3). We employed GALFIT to estimate host galaxy contamination in the optical/UV and determine the intrinsic AGN fluxes. We used an absorbed power law with a reflection component to model the X-ray spectra and a dust-reddened multi-temperature blackbody to fit the optical/UV SED. We calculated total bolometric luminosities ($L_{bol}$), optical-to-X-ray spectral indices ($α_{ox}$), and multiple bolometric corrections (BCs) in the optical, UV, and X-rays. We used black hole masses obtained by reverberation mapping and the virial method to estimate Eddington ratios ($λ_{Edd}$) for all our AGN. We confirm the tight correlation between UV and X-ray luminosity for our sample. We observe a significant decrease in $α_{ox}$ with $L_{bol}$ and $λ_{Edd}$, suggesting that brighter sources emit more UV photons per X-rays. We report a second-order regression relation between the 2-10 keV BC and $α_{ox}$, which is useful to compute $L_{bol}$ in the absence of multiband SEDs. We also investigate the dependence of optical/UV BCs on the physical properties of AGN and obtain a significant increase in the UV BCs with $L_{bol}$ and $λ_{Edd}$, unlike those in the optical, which are constant across five orders of $L_{bol}$ and $λ_{Edd}$. We obtain significant dispersions (~0.1-1 dex) in all BCs, and hence recommend using appropriate relations with observed quantities while including the reported scatter, instead of their median values.
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