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arXiv 0709.2310astro-ph
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模拟螺旋星系的SEDs

Modelling the SEDs of spiral galaxies

Cristina C. Popescu, Richard J. Tuffs

摘要:

对Herschel观测到的螺旋星系的UV/光学-红外/亚毫米SEDs进行建模将是定量解释这些观测结果的一个重要工具,这些观测结果将反映这些系统现在和过去的恒星形成活动。在这个演讲中,我们描述了我们开发的SED建模技术,它的应用和预测测试。我们表明,无论是全色SED模型的个别星系和B波段衰减倾斜关系的大的统计样本表明,螺旋星系在附近的宇宙表现为光学厚系统在其全球性和大规模的光分布(中央面对B波段不透明度约。4)。然而,盘星系是非常不均匀的系统,既有光学厚的部分(如旋臂),也有光学薄的部分(如臂间区域),后者使星系对背景星系透明。

英文摘要:

Modelling the UV/optical - infrared/submm SEDs of spiral galaxies observed with Herschel will be an essential tool to quantitatively interpret these observations in terms of the present and past star-formation activity of these systems. In this lecture we describe the SED modelling technique we have developed, its applications and tests of its predictions. We show that both the panchromatic SED modelling of individual galaxies and the B-band attenuation-inclination relation of large statistical samples suggest that spiral galaxies in the nearby Universe behave as optically thick systems in their global properties and large-scale distribution of light (central face-on B-band opacity of approx. 4). However disk galaxies are very inhomogeneous systems, having both optically thick components (e.g. spiral arms), and optically thin components (e.g. the interarm regions), the latter making galaxies transparent to background galaxies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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