论文标题
阿尔玛（Alma）镜头集群调查：一个阿尔玛（Alma Galaxy）标记为Z = 4.3的Muse Galaxy集团在'El Gordo'之后
ALMA Lensing Cluster Survey: an ALMA galaxy signposting a MUSE galaxy group at z=4.3 behind 'El Gordo'
论文作者
论文摘要
我们报告了Z = 4.32的多单元光谱探索器（MUSE）星系组，由大型星系群集ACT-CL ACT-CL J0102-4915（又名El Gordo）以Z = 0.87镜头，与1.2 mm的源相关，该源为2.07 +/- 0.88 KPC的距离，该距离为2.88 KPC的距离。整个系统的三张图像出现在图像平面中。在Atacama大型毫米/亚毫米阵列（ALMA）镜头簇调查（ALCS）中已检测到1.2 mM源。由于该Alma源在波长lambda <2微米处未检测到，因此无法独立确定其红移，但是，三个镜头组件表明它属于z = 4.32的同一星系组。 The four members of the MUSE galaxy group have low to intermediate stellar masses (~ 10^7-10^{10} Msun) and star formation rates (SFRs) of 0.4-24 Msun/yr, resulting in high specific SFRs (sSFRs) for two of them, which suggest that these galaxies are growing fast (with stellar-mass doubling times of only ~ 2x10^7 years). Starburst星系的高发生率可能是银河系中相互作用的结果，该组是紧凑且具有高速分散体的相互作用。基于放大校正的亚/毫米连续通量密度和估计的恒星质量，我们推断出，Alma源被归类为普通的超露露红外红外星系（带有相关的SFR 〜200-300 MSUN/YR），并在星形序列上放置。该报道的ALMA/MUSE组协会的案例表明，一些可能孤立的Alma来源实际上是高红移的富裕星形环境的路标。
We report the discovery of a Multi Unit Spectroscopic Explorer (MUSE) galaxy group at z=4.32 lensed by the massive galaxy cluster ACT-CL J0102-4915 (aka El Gordo) at z=0.87, associated with a 1.2 mm source which is at a 2.07+/-0.88 kpc projected distance from one of the group galaxies. Three images of the whole system appear in the image plane. The 1.2 mm source has been detected within the Atacama Large Millimetre/submillimetre Array (ALMA) Lensing Cluster Survey (ALCS). As this ALMA source is undetected at wavelengths lambda < 2 microns, its redshift cannot be independently determined, however, the three lensing components indicate that it belongs to the same galaxy group at z=4.32. The four members of the MUSE galaxy group have low to intermediate stellar masses (~ 10^7-10^{10} Msun) and star formation rates (SFRs) of 0.4-24 Msun/yr, resulting in high specific SFRs (sSFRs) for two of them, which suggest that these galaxies are growing fast (with stellar-mass doubling times of only ~ 2x10^7 years). This high incidence of starburst galaxies is likely a consequence of interactions within the galaxy group, which is compact and has high velocity dispersion. Based on the magnification-corrected sub-/millimetre continuum flux density and estimated stellar mass, we infer that the ALMA source is classified as an ordinary ultra-luminous infrared galaxy (with associated dust-obscured SFR~200-300 Msun/yr) and lies on the star-formation main sequence. This reported case of an ALMA/MUSE group association suggests that some presumably isolated ALMA sources are in fact signposts of richer star-forming environments at high redshifts.
