THE OPACITY OF GALACTIC DISKS AT z ∼ 0.7
THE OPACITY OF GALACTIC DISKS AT z ∼ 0.7
复制标题
z ~ 0.7 处的银盘不透明度
DOI：
10.1088/2041-8205/714/1/l113
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Y. Taniguchi
中科院分区：
文献类型：
--
作者：
M. Sargent;C. Carollo;P. Kampczyk;S. Lilly;C. Scarlata;P. Capak;O. Ilbert;A. Koekemoer;J. Kneib;A. Leauthaud;R. Massey;P. Oesch;J. Rhodes;E. Schinnerer;N. Scoville;Y. Taniguchi
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与人工红移样本的斯隆数字巡天（SDSS）磁盘以及匹配的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，z = 0.7的大圆盘具有几乎平坦的表面亮度-倾角关系，这表明它们比本地对应物更不透明。这可以解释为在更高的红移下，圆盘中光学厚材料的数量增加，或者尘埃的空间分布不同。
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 Sloan Digital Sky Survey (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.