论文标题
Mac的形态型j0416.1-2403低质量星系
Morpho-kinematics of MACS J0416.1-2403 low mass galaxies
论文作者
论文摘要
我们使用VLT/MUSE的光谱以及HST和VLT/HAWK-I的光度观察结果研究17个低质量Macs J0416.1-2403在R200和5个野外星系的群集星系的形态型型，并具有Z〜0.4的射量。通过测量排放线的通量，我们恢复了恒星形成速率，气相金属率和空间分辨的气体运动学。我们已经从光度数据中分析了星系的结构和形态，将多组分分解为凸起和磁盘进行了多组分分解。使用3D方法对空间分辨的气速度场进行建模，这使我们能够检索其内在气体运动学，包括最大旋转速度和速度分散。群集和现场群体可以归类为恒星形成主要序列星系，只有4个淬灭系统的子样本。最低的质量系统偏离了基本金属关系的预测，显示了较高的金属性，而较高的质量质量关系符合模型预测。这可能暗示着原始气体流入和/或去除热光晕气的临界值，因为机构驱动了这些偏移。我们的形态基因分析揭示了最大速度vmax <50 km/s的矮人的子样本，这些速度偏离了Tully-Fisher的关系。这可能表明它们的星际介质受RAM压力剥离的影响。但是，约有30％的聚类星系具有旋转为主的气盘，并遵循塔利 - 菲什（Tully-Fisher）关系。在恒星质量-S0.5平面中，系统遵循一个紧密的序列，只有5个星系的子构造与这种关系有着强烈的背离。离群星系的形态和运动学都暗示了预处理和集群特异性相互作用影响其恒星和气盘的结合。
We use optical spectroscopy from VLT/MUSE, as well as photometric observations from HST and VLT/HAWK-I, to study the morpho-kinematics of 17 low mass MACS J0416.1-2403 cluster galaxies at R200 and 5 field galaxies with a redshift of z~0.4. By measuring fluxes of emission lines, we have recovered the star formation rates, gas-phase metallicities and the spatially resolved gas kinematics. We have analysed the structure and morphology of the galaxies from the photometric data, performing a multi-component decomposition into a bulge and a disk. The spatially resolved gas velocity fields were modelled using a 3D approach, which allowed us to retrieve their intrinsic gas kinematics, including the maximum rotation velocity and velocity dispersion. The cluster and field population can be classified as star forming main-sequence galaxies, with only a sub-sample of 4 quenched systems. The lowest mass systems deviate from the predictions of the fundamental metallicity relation, showing higher metallicities, whereas the higher mass ones are in accordance with the model predictions. This might hint at the cut-off of pristine gas inflow and/or the removal of the hot halo gas as the mechanisms driving these offsets. Our morpho-kinematic analysis reveals a sub-sample of dwarfs with maximum velocities vmax <50 km/s, which depart from the Tully-Fisher relation. This might indicate that their interstellar medium is affected by ram pressure stripping. However, ~30% of the cluster galaxies have rotation-dominated gas disks and follow the Tully-Fisher relation. In the stellar mass-S0.5 plane, the systems follow a tight sequence, with only a sub-population of 5 galaxies strongly departing from this relation. Both the morphology and kinematics of the outlier galaxies hint at a combination of pre-processing and cluster-specific interactions affecting their stellar and gas disks.
