紫外选择亚L ~* 星系z~2处的质量积累
The build-up of mass in UV-selected sub-L* galaxies at z~2
摘要：
利用宽带光谱能量分布（SED）拟合方法研究了z~2处的紫外选择亚L ~* 星系深源样品。它们被发现比L* 星系的尘埃少，并且在这个时代对宇宙质量预算的贡献比从较浅的高Z调查中推断的更多。此外，SFR被发现与恒星质量成比例超过三个数量级的质量;这一现象可以通过假设新的恒星形成的气体与暗物质共同吸积到星系的暗物质晕上来解释，这种情况自然会导致SFR随着时间的推移逐渐增加。
英文摘要：
Broadband spectral energy distribution (SED) fitting is used to study a deep sample of UV-selected sub-L* galaxies at z~2. They are found to be less dusty than L* galaxies, and to contribute more mass to the cosmic mass budget at this epoch than is inferred from shallower high-z surveys. Additionally, SFRs are found to be proportional to stellar masses over three orders of magnitude in mass; this phenomenon can be explained by assuming that new stars form out of gas that co-accretes along with dark matter onto the galaxies' dark matter halos, a scenario that naturally leads to SFRs that gradually increase with time.
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