NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-19 T00:53:54 PDT
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For refcode 2016MNRAS.459.2212M:
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Copyright by Royal Astronomical Society. 2016MNRAS.459.2212M Galaxy evolution in nearby galaxy groups - III. A GALEX view of NGC 5846, the largest group in the local universe Marino, Antonietta; Mazzei, Paola; Rampazzo, Roberto; Bianchi, Luciana Abstract. We explore the co-evolution of galaxies in nearby groups (V_hel_ <= 3000 km s^-1^) with a multiwavelength approach. We analyse GALEX far-UV (FUV) and near-UV (NUV) imaging, and Sloan Digital Sky Survey u, g, r, i, z data of groups spanning a large range of dynamical phases. We characterize the photometric properties of spectroscopically confirmed galaxy members and investigate the global properties of the groups through a dynamical analysis. Here, we focus on NGC 5846, the third most massive association of early-type galaxies (ETGs) after the Virgo and Fornax clusters. The group, composed of 90 members, is dominated by ETGs (about 80 per cent), and among ETGs about 40 per cent are dwarfs. Results are compared with those obtained for three groups in the LeoII cloud, which are radically different both in member-galaxy population and dynamical properties. The FUV-NUV cumulative colour distribution and the normalized UV luminosity function (LF) significantly differ due to the different fraction of late-type galaxy population. The UV LF of NGC 5846 resembles that of the Virgo cluster, however our analysis suggests that star formation episodes are still occurring in most of the group galaxies, including ETGs. The NUV-i colour distribution, the optical-UV colour-colour diagram, and NUV-r versus M_r_ colour-magnitude relation suggest that the gas contribution cannot be neglected in the evolution of ETG-type group members. Our analysis highlights that NGC 5846 is still in an active phase of its evolution, notwithstanding the dominance of dwarf and bright ETGs and its virialized configuration. Key words: galaxies: evolution, galaxies: formation, galaxies: groups: individual: NGC 5846 group, USGC U677, galaxies: kinematics and dynamics, galaxies: photometry, Ultraviolet: galaxies
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