论文标题
MOSEL调查：Z = 3-4的EOR类似物中的流出非常弱
MOSEL Survey: Extremely weak outflows in EoR analogues at z=3-4
论文作者
论文摘要
本文介绍了Z = 3-4处星系的深度K波段光谱观测，并具有复合光度静电架HB+[OIII]等效宽度EW_0> 600A，可与Reionionation期间观察到的星系EW相媲美（EOR，EOR，Z> 6）。我们目标的典型光谱[OIII] EW_0和恒星质量为〜700A和log（m_star/m_sun）= 8.98。通过堆叠[OIII]发射概况，我们发现了f_broad/f_narrow 〜0.2和速度宽度sigma_ {broad} 〜170 km/s的弱宽成分的证据。随着堆积样品的恒星质量和[OIII] EW_0，宽分量的强度和速度宽度不会显着变化。假设[OIII]和HALPHA发射具有相似的广泛分量曲线，我们估计质量负载因子〜0.2，即使我们样品的恒星形成速率高10倍，在z> 1处的低恒星质量星系也相似。我们假设，超新星驱动的流出的多性性质，或者在极端恒星形成方案中的风抑制是导致EOR类似物中流出的弱特征。
This paper presents deep K-band spectroscopic observations of galaxies at z=3-4 with composite photometric rest-frame Hb+[OIII] equivalent widths EW_0>600A, comparable to the EW of galaxies observed during the epoch of reionisation (EoR, z>6). The typical spectroscopic [OIII] EW_0 and stellar mass of our targets is ~ 700A and log(M_star/M_sun)=8.98. By stacking the [OIII] emission profiles, we find evidence of a weak broad component with F_broad/F_narrow ~ 0.2 and velocity width sigma_{broad} ~ 170 km/s. The strength and velocity width of the broad component does not change significantly with stellar mass and [OIII] EW_0 of the stacked sample. Assuming similar broad component profiles for [OIII] and Halpha emission, we estimate a mass loading factor ~0.2, similar to low stellar mass galaxies at z>1 even if the star formation rates of our sample is 10 times higher. We hypothesize that either the multi-phase nature of supernovae driven outflows or the suppression of winds in the extreme star-forming regime is responsible for the weak signature of outflows in the EoR analogues.
