论文标题
我们可以使用空间集成的SED拟合来限制星系几何参数吗？
Can we constrain galaxy geometry parameters using spatially integrated SED fitting?
论文作者
论文摘要
复杂的光谱能分布（SED）模型描述了使用几何参数的尘埃衰减和发射。这种处理是自然的，因为星系中的潜在恒星粉尘几何形状驱动了灰尘效应。一个例子是明星的SED模型，该模型将银河系分为恒星磁盘，恒星凸起和尘埃。这项工作利用明星SED模型使用空间集成的SED拟合来研究推断几何参数的功效。我们的方法将SED模型拟合到通过将半分析模型与相同的SED模型相结合而产生的模拟光度法。我们的拟合结果表明，磁盘半径可能受到限制，而倾斜角，灰尘磁盘与恒星磁盘半径比，凸起半径以及内在的凸起与总发光比也不约束，即使使用了21个来自紫外线到FIR的过滤器。我们还研究了S/N的影响，发现S/N（高达80）的增加给结果带来了有限的改善。我们提供详细的讨论来解释这些发现，并指出对具有更通用几何形状的模型的含义。
Sophisticated spectral energy distribution (SED) models describe dust attenuation and emission using geometry parameters. This treatment is natural since dust effects are driven by the underlying star-dust geometry in galaxies. An example is the Starduster SED model, which divides a galaxy into a stellar disk, a stellar bulge, and a dust disk. This work utilises the Starduster SED model to study the efficacy of inferring geometry parameters using spatially integrated SED fitting. Our method fits the SED model to mock photometry produced by combining a semi-analytic model with the same SED model. Our fitting results imply that the disk radius can be constrained, while the inclination angle, dust disk to stellar disk radius ratio, bulge radius and intrinsic bulge to total luminosity ratio are unconstrained, even though 21 filters from UV to FIR are used. We also study the impact of S/N, finding that the increase of S/N (up to 80) brings limited improvements to the results. We provide a detailed discussion to explain these findings, and point out the implications for models with more general geometry.
