Galaxy kinematics across different environments in the RXJ1347-1145 cluster complex

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作者：
Pérez-Martínez, J.M. [1 ]
Ziegler, B. [1 ]
Böhm, A. [1 ]
Verdugo, M. [1 ]
机构：
[1] Department of Astrophysics, University of Vienna, Türkenschanzstr. 17, Vienna,1180, Austria
来源：
Astronomy and Astrophysics | 2020年 / 637卷
关键词：
Aims. In order to understand the role of the different processes that drive galaxy evolution in clusters; we need comprehensive studies that simultaneously examine several of the most important physical properties of galaxies. In this work we study the interplay between the kinematic state and star formation activity of galaxies in the RXJ1347-1145 cluster complex at z ∼ 0.45. Methods. We used VLT/VIMOS to obtain slit spectra for 95 galaxies across the 40 × 40 area where the RXJ1347-1145 cluster complex resides. We determined the cluster membership of our targets by identifying one or more of the available emission lines within the wavelength range. Our spectroscopy is complemented with archival SUBARU/Suprime-Cam deep photometric observations in five optical bands (B; V; Rc; Ic; z). We examined the kinematic properties of our sample attending to the degree of distortion of the extracted rotation curves. Regular rotating galaxies were included in our Tully-Fisher analysis while the distorted ones were used to study the role of cluster-specific interactions with respect to star formation and AGN activity. Results. Our analysis confirmed the cluster membership for approximately half of our targets. We report a higher fraction of galaxies with irregular gas kinematics in the cluster environment than in the field. Cluster galaxies with regular rotation display a moderate brightening in the B-band Tully-Fisher relation compatible with the gradual evolution of the stellar populations with lookback time; and no significant evolution in the stellar-mass Tully-Fisher relation; in line with previous studies at similar redshift. Average specific star formation rate values are slightly lower in our cluster sample (-0.15 dex) with respect to the main sequence of star-forming galaxies; confirming the role of the environment in the early quenching of star formation in clusters. Finally; we carried out an exploratory observational study on the stellar-to-halo mass relation finding that cluster galaxies tend to have slightly lower stellar mass values for a fixed halo mass compared to their field counterparts. © ESO 2020;
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