z~0.7时银河系的不透明度
The Opacity of Galactic Disks at z~0.7
摘要：
我们比较的表面亮度倾角关系的COSMOS纯盘星系的样本在z~0.7与人工红移的SDSS盘样本以及COSMOS样本的静止框架光度学和形态学，以及它们的选择和分析。在红移的SDSS样本中，正面和侧面盘的平均表面亮度之间的偏移与通过测量附近宇宙中星系盘的光学深度所预测的相匹配。相比之下，在z~0.7处的大圆盘具有几乎平坦的表面亮度-倾斜关系，这表明它们比它们的局部对应物更不透明。这可以解释为在更高的红移下，圆盘中光学厚度的材料数量增加，或者尘埃的空间分布不同。
英文摘要：
We compare the surface brightness-inclination relation for a sample of COSMOS pure disk galaxies at z~0.7 with an artificially redshifted sample of SDSS disks well matched to the COSMOS sample in terms of rest-frame photometry and morphology, as well as their selection and analysis. The offset between the average surface brightness of face-on and edge-on disks in the redshifted SDSS sample matches that predicted by measurements of the optical depth of galactic disks in the nearby universe. In contrast, large disks at z~0.7 have a virtually flat surface brightness-inclination relation, suggesting that they are more opaque than their local counterparts. This could be explained by either an increased amount of optically thick material in disks at higher redshift, or a different spatial distribution of the dust.
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