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arXiv 2205.15331astro-ph.GA
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Fornax3D计划:根据深度成像和积分场光谱学研究天炉座星系团中大质量早型星系的聚集历史

The Fornax3D project: The assembly history of massive early-type galaxies in the Fornax cluster from deep imaging and integral field spectroscopy

M. Spavone, E. Iodice, G. D'Ago, G. van de Ven, L. Morelli, E. M. Corsini, M. Sarzi, L. Coccato, K. Fahrion, J. Falcón-Barroso, D. A. Gadotti, M. Lyubenova, I. … 展开作者

M. Spavone, E. Iodice, G. D'Ago, G. van de Ven, L. Morelli, E. M. Corsini, M. Sarzi, L. Coccato, K. Fahrion, J. Falcón-Barroso, D. A. Gadotti, M. Lyubenova, I. Martín-Navarro, R. M. McDermid, F. Pinna, A. Pizzella, A. Poci, P. T. de Zeeuw, L. Zhu

摘要:

这项工作是基于高质量的积分场光谱数据获得的多单元光谱探测器(MUSE)的甚大望远镜(VLT)。在天炉座星系团维里半径内的21个最亮的($m_B\leq 15$等)早型星系(ETG)被观测到的距离为$\sim2-3\ R_{\rm e}$。VLT巡天望远镜(VST)的深度成像也可用于样品ETG。我们调查的星系结构特性的变化作为总恒星质量和集群环境的函数。此外,我们相关的发光组件的大小尺度来自VST的表面亮度径向配置文件的样本ETGs与恒星运动学和人口特性的MUSE径向配置文件的多分量分解。结果与理论预测和以前的观测研究进行了比较,并用于解决大规模ETG的天炉座星系团的组装历史。我们发现,星系团的核心和南北集群,其中有最高的吸积质量分数,在其外围比星系落入集群的金属丰度梯度温和。我们还发现,在年龄和金属丰度之间的分离属于核心和南北星系团和下落星系。新的发现很好地符合天炉座星系团的组装历史的一般框架。

英文摘要:

This work is based on high quality integral-field spectroscopic data obtained with the Multi Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope (VLT). The 21 brightest ($m_B\leq 15$ mag) early-type galaxies (ETGs) inside the virial radius of the Fornax cluster are observed out to distances of $\sim2-3\ R_{\rm e}$. Deep imaging from the VLT Survey Telescope (VST) is also available for the sample ETGs. We investigate the variation of the galaxy structural properties as a function of the total stellar mass and cluster environment. Moreover, we correlate the size scales of the luminous components derived from a multi-component decomposition of the VST surface-brightness radial profiles of the sample ETGs with the MUSE radial profiles of stellar kinematic and population properties. The results are compared with both theoretical predictions and previous observational studies and used to address the assembly history of the massive ETGs of the Fornax cluster. We find that galaxies in the core and north-south clump of the cluster, which have the highest accreted mass fraction, show milder metallicity gradients in their outskirts than the galaxies infalling into the cluster. We also find a segregation in both age and metallicity between the galaxies belonging to the core and north-south clump and the infalling galaxies. The new findings fit well within the general framework for the assembly history of the Fornax cluster.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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