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- W2950314664 abstract "The RCS 2319+00 supercluster is a massive supercluster at z = 0.9 comprising three optically selected, spectroscopically confirmed clusters separated by 10^13 solar masses for the infalling groups. These group masses are in agreement with the halo sizes found to be important in cluster galaxy pre-processing in N -body simulation merger tree studies based on hierarchical formation models.In conjunction with multiwavelength data, we use the spectroscopic members and their FOF associations as isolated, group or core galaxies to investigate the role of both the local and global environment on cluster galaxies' stellar mass and star formation. The z = 0.9 RCS2319+00 supercluster is found to follow the local SFR-density relation, with the star formation primarily located in the lower density, infalling isolated and group regions. We see suggestions of both enhanced star formation activity and star formation quenching over the supercluster field. The densest regions of the groups and isolated outskirt galaxies show hints of enhanced star formation activity. There is evidence of a bimodal distribution in the SFRs with stellar mass: the known main sequence of increasing SFR with increasing stellar mass, and a sub-main sequence population of partially quenched star forming galaxies. The sub-main sequence itself seems to be divided between environment-quenching and mass- quenching effects.We propose that the infalling groups in RCS 2319+00 are in varying stages of pre-processing, with their star formation activity level falling between that of the isolated supercluster galaxies and the less-active, more massive cluster cores. Overall, our results align with the theoretical models that predict galaxy pre-processing in group environments before final accretion onto cluster sized halos.%%%%Le super-amas RCS2319+00 est un super-amas massif a z = 0,9 comprenant trois amas selectionnes optiquement et confirmes par spectroscopie. Ces amas sont separes par < 3 Mpc dans le plan du ciel. Ce super-amas est l'un des rares exemples connus d'ancetres d'amas massifs d'aujourd'hui (10^15 masses solaires par z ~ 0.5). RCS 2319+00 nous permet donc d'etre temoin de l'accumulation hierarchique de la structure a grande echelle dans l'Univers.Nous…" @default.
- W2950314664 created "2019-06-27" @default.
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- W2950314664 date "2014-01-01" @default.
- W2950314664 modified "2023-09-26" @default.
- W2950314664 title "Investigating the structure, star formation and stellar mass of the z = 0.9 supercluster RCS 2319+00" @default.
- W2950314664 hasPublicationYear "2014" @default.
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