Intense Star Formation and Feedback at High Redshift: Spatially Resolved Properties of the z = 2.6 Submillimeter Galaxy SMM J14011+0252
Intense Star Formation and Feedback at High Redshift: Spatially Resolved Properties of the z = 2.6 Submillimeter Galaxy SMM J14011+0252
复制标题
DOI：
10.1086/511151
复制
发表时间：
2006-11
期刊：
影响因子：
--
通讯作者：
N. Nesvadba;M. Lehnert;R. Genzel;F. Eisenhauer;A. Baker;S. Seitz;R. Davies;D. Lutz;L. Tacconi;M. Tecza;R. Bender;R. Abuter
中科院分区：
文献类型：
--
作者：
N. Nesvadba;M. Lehnert;R. Genzel;F. Eisenhauer;A. Baker;S. Seitz;R. Davies;D. Lutz;L. Tacconi;M. Tecza;R. Bender;R. Abuter
我们提出了一个详细的分析透镜亚毫米星系（SMG）SMM J14011+0252在z = 2.56的空间分辨特性，结合深近红外积分场数据与SPIFFI获得的VLT与其他多波长数据集。正如其他作者先前所讨论的，SMM J14011+0252的广泛特征，特别是亚毫米星系的普遍特征，与本地大质量球状星系早期演化的预期一致。从连续和线通量，速度和色散图，我们测量的运动学，星星的形成率，气体密度和灭绝的个别子组件。星星的形成强度类似于低红移的“最大星爆”，而发射线气体的线通量和动力学为星爆驱动的风提供了直接证据，其物理性质与当地的超级风非常相似。我们还发现间接证据“自我调节”星星形成内J1。蓝色伴星J2的相对速度给出了J1的动力学质量估计，其值在Mdyn ~ 1 × 1011 M的20 kpc范围内。J2的相对金属丰度比J1 n/J1 s低0.4 dex，表明不同的星星形成历史。光谱能量分布拟合的连续峰J1 c确认和证实了以前的建议，该组件是一个z = 0.25的interloper。当去除J1 c时，恒星连续谱和Hα线辐射在两个单独的分量J1 n和J1 s中在空间上排列得很好，并且与速度图中两个运动学上不同的区域重合，这很可能表明合并系统。这突出了SMG和超亮红外星系（ULIRG）之间的密切相似性，这往往是合并驱动的最大恒星爆发，并表明星星形成的内在机制和相关的反馈实际上是类似的低红移强烈的恒星形成系统。
We present a detailed analysis of the spatially resolved properties of the lensed submillimeter galaxy (SMG) SMM J14011+0252 at z = 2.56, combining deep near-infrared integral-field data obtained with SPIFFI on the VLT with other multiwavelength data sets. As previously discussed by other authors, the broad characteristics of SMM J14011+0252 in particular and submillimeter galaxies in general are in agreement with what is expected for the early evolution of local massive spheroidal galaxies. From continuum and line flux, velocity, and dispersion maps, we measure the kinematics, star formation rates, gas densities, and extinction for individual subcomponents. The star formation intensity is similar to low-redshift "maximal starbursts," while the line fluxes and the dynamics of the emission line gas provide direct evidence for a starburst-driven wind with physical properties very similar to local superwinds. We also find circumstantial evidence for "self-regulated" star formation within J1. The relative velocity of the bluer companion J2 yields a dynamical mass estimate for J1 within ~20 kpc of Mdyn ~ 1 × 1011 M☉. The relative metallicity of J2 is 0.4 dex lower than in J1n/J1s, suggesting different star formation histories. Spectral energy distribution fitting of the continuum peak J1c confirms and substantiates previous suggestions that this component is a z = 0.25 interloper. When removing J1c, the stellar continuum and Hα line emission appear well aligned spatially in two individual components, J1n and J1s, and coincide with two kinematically distinct regions in the velocity map, which might well indicate a merging system. This highlights the close similarity between SMGs and ultraluminous infrared galaxies (ULIRGs), which are often merger-driven maximal starbursts, and suggests that the intrinsic mechanisms of star formation and related feedback are in fact similar to low-redshift strongly star-forming systems.