利用辐射转移模型推导M51的内禀性质
Deriving the intrinsic properties of M51 with radiative transfer models
AI总结：
本研究构建了M51星系的轴对称辐射转移模型，复现其多波段观测径向轮廓，推导恒星与尘埃的内禀参数，发现连接M51与伴星系的暗弱外盘，并提出尘埃性质随星系内部变化的替代模型，助力星系演化研究。
摘要：
定量推导星系与其基本组成单元气体、尘埃和恒星相关的内禀性质，对于我们理解星系演化至关重要。通过受全色成像观测约束的辐射转移（radiative transfer, RT）方法，可以实现对这些性质的完全自洽推导。本文提出了一个面向正面旋涡星系M51的紫外-光学-远红外/亚毫米光谱与空间能量分布的轴对称RT模型。该模型较好地复现了由GALEX、SDSS、2MASS、Spitzer和Herschel等设备获取的该星系成像数据所得到的方位平均径向轮廓。我们用三个不同的形态组分来建模该星系：核球、内盘和主盘，推导了恒星发射率和尘埃分布的长度参数，还得到了M51的内禀整体参数与空间分辨参数。我们发现了一个连接M51与其伴星系M51b的暗弱“外盘”。最后，我们提出并讨论了一个尘埃性质在星系内部变化的替代模型。
英文摘要：
A quantitative derivation of the intrinsic properties of galaxies related to their fundamental building blocks, gas, dust and stars is essential for our understanding of galaxy evolution. A fully self-consistent derivation of these properties can be achieved with radiative transfer (RT) methods that are constrained by panchromatic imaging observations. Here we present an axi-symmetric RT model of the UV-optical-FIR/submm spectral and spatial energy distribution of the face-on spiral galaxy M51. The model reproduces reasonably well the azimuthally averaged radial profiles derived from the imaging data available for this galaxy, from GALEX, SDSS, 2MASS, Spitzer and Herschel. We model the galaxy with three distinct morphological components: a bulge, an inner disc and a main disc. We derive the length parameters of the stellar emissivity and of the dust distribution. We also derive the intrinsic global and spatially resolved parameters of M51. We find a faint \lq\lq outer disc\rq\rq\ bridging M51 with its companion galaxy M51b. Finally, we present and discuss an alternative model, with dust properties that change within the galaxy.
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