z ~ 2 - VII星系的GMASS超深光谱。从UV光谱看恒星的形成、熄灭和气体流出
GMASS ultradeep spectroscopy of galaxies at z ~ 2 - VII. Star formation, extinction, and gas outflows from UV spectra
摘要：
利用静止标架紫外光谱研究了银河系质量大会超深光谱巡天（GMASS）中z ~ 2恒星形成星系的大尺度气体外流、尘埃消光和恒星形成速率的相关性质。尘埃消光估计从休息帧紫外线连续斜率，并用于获得样本的星系尘埃校正的恒星形成率。对于整个样品，连续斜率<β>的平均值= -1.11 \pm 0.44（r.m.s.）而平均SFR被发现<SFR>= 52 \pm 48 M_sun/yr（r.m.s.）。观测到SFR与恒星质量之间的正相关关系，其对数斜率为1.10 \pm 0.10。低电离吸收线，与星际介质，被发现是蓝移，相对于系统的静止框架，这表明有外流气体的典型速度的顺序约100公里/秒。最后，调查星系的紫外光谱特性和星系的一般属性之间的相关性，我们报告了星际吸收线的等效宽度和SFR，恒星质量和颜色过剩之间可能存在的相关性，类似于看到在不同的红移举行。
英文摘要：
We use rest-frame UV spectroscopy to investigate the properties related to large-scale gas outflows, and to the dust extinction and star-formation rates of a sample of z ~ 2 star-forming galaxies from the Galaxy Mass Assembly ultradeep Spectroscopic Survey (GMASS). Dust extinction is estimated from the rest-frame UV continuum slope and used to obtain dust-corrected star-formation rates for the galaxies of the sample. For the entire sample, a mean value of the continuum slope <β> = -1.11 \pm 0.44 (r.m.s.) was derived, while the average SFR was found to be <SFR> = 52 \pm 48 M_sun/yr (r.m.s.). A positive correlation between SFR and stellar mass was observed, in agreement with other works, the logarithmic slope of the relation being 1.10 \pm 0.10. Low-ionization absorption lines, associated with the interstellar medium, were found to be blueshifted, with respect to the rest frame of the system, which indicates that there is outflowing gas with typical velocities of the order of ~ 100 km/s. Finally, investigating correlations between galaxy UV spectral characteristics and galaxy general properties, we report a possible correlation between the equivalent width of the interstellar absorption lines and SFR, stellar mass, and colour excess similar to that seen to hold at different redshifts.
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