Pilot-WINGS: An extended MUSE view of the structure of Abell 370

Pilot-WINGS: An extended MUSE view of the structure of Abell 370
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Pilot-WINGS:Abell 370 结构的扩展 MUSE 视图

DOI:
10.1093/mnras/stac418
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发表时间:
2022
影响因子:
4.8
通讯作者:
Mahler, Guillaume
Mahler, Guillaume
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Lagattuta, David J.;Richard, Johan;Bauer, Franz Erik;Cerny, Catherine;Claeyssens, Adélaïde;Guaita, Lucia;Jauzac, Mathilde;Jeanneau, Alexandre;Koekemoer, Anton M.;Mahler, Guillaume

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我们利用多单元光谱探测器(MUSE)的宽积分场单位(IFU)光谱镶嵌研究了强透镜星团Abell 370(A370)。IFU光谱学提供了对星系团结构和质量含量的重要洞察,然而基于IFU的星系团研究几乎完全集中在中心爱因斯坦半径区域。新的缪斯马赛克覆盖了14个arcmin2,远远超出了A370爱因斯坦半径,第一次提供了对星系团郊区的详细观察。将这些数据与布法罗项目的广视场、多波段HubbleSpace Telescope(HST)成像相结合,我们分析了星系团内和视线上物体的分布。识别了416个星系团星系,我们使用运动学来跟踪光晕的径向质量轮廓,提供了一个独立于透镜模型的质量估计。我们还测量星系团成员的径向平均属性,跟踪它们作为流入函数的演变。由于我们数据的高空间分辨率,我们确定了六个星系团成员作为星系-星系透镜,这些透镜将局域质量分布限制在爱因斯坦半径之外。最后,利用MUSE的3D能力,我们探测和分析了星系团外的多个空间扩展的过密度,这些超密度影响了透镜导出的晕质量估计。我们强调,这项工作中的许多工作都要归功于IFU强大而广泛的覆盖范围,这突出了它的重要性,即使在光学密度较低的星系团区域也是如此。总体而言,这项工作展示了结合HST+MUSE的力量,并作为迈向针对几个集群的更大和更广泛计划的第一步。
We investigate the strong-lensing cluster Abell 370 (A370) using a wide Integral Field Unit (IFU) spectroscopic mosaic from the Multi-Unit Spectroscopic Explorer (MUSE). IFU spectroscopy provides significant insight into the structure and mass content of galaxy clusters, yet IFU-based cluster studies focus almost exclusively on the central Einstein-radius region. Covering over 14 arcmin2, the new MUSE mosaic extends significantly beyond the A370 Einstein radius, providing, for the first time, a detailed look at the cluster outskirts. Combining these data with wide-field, multi-bandHubbleSpace Telescope (HST) imaging from the BUFFALO project, we analyse the distribution of objects within the cluster and along the line of sight. Identifying 416 cluster galaxies, we use kinematics to trace the radial mass profile of the halo, providing a mass estimate independent from the lens model. We also measure radially averaged properties of the cluster members, tracking their evolution as a function of infall. Thanks to the high spatial resolution of our data, we identify six cluster members acting as galaxy–galaxy lenses, which constrain localized mass distributions beyond the Einstein radius. Finally, taking advantage of MUSE’s 3D capabilities, we detect and analyse multiple spatially extended overdensities outside of the cluster that influence lensing-derived halo mass estimates. We stress that much of this work is only possible thanks to the robust, extended IFU coverage, highlighting its importance even in less optically dense cluster regions. Overall, this work showcases the power of combiningHST+ MUSE, and serves as the initial step towards a larger and wider program targeting several clusters.
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