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Satellite content and quenching of star formation in galaxy groups at<i>z</i>~ 1.8
Gobat, R.,Daddi, E.,Bé,thermin, M.,Pannella, M.,Finoguenov, A.,Gozaliasl, G.,Le Floc’h, E.,Schreiber, C.,Strazzullo, V.,Sargent, M.,Wang, T.,Hwang, H. S.,Valentino, F.,Cappelluti, N.,Li, Y.,Hasi EDP Sciences 2015 Astronomy and astrophysics Vol.581 No.-
METAL DEFICIENCY IN CLUSTER STAR-FORMING GALAXIES AT<i>Z</i>= 2
Valentino, F.,Daddi, E.,Strazzullo, V.,Gobat, R.,Onodera, M.,Bournaud, F.,Juneau, S.,Renzini, A.,Arimoto, N.,Carollo, M.,Zanella, A. IOP Publishing 2015 The Astrophysical journal Vol.801 No.2
<P>We investigate the environmental effect on the metal enrichment of star-forming galaxies (SFGs) in the farthest spectroscopically confirmed and X-ray-detected cluster, CL J1449+0856 at z = 1.99. We combined Hubble Space Telescope/WFC3 G141 slitless spectroscopic data, our thirteen-band photometry, and a recent Subaru/Multi-object InfraRed Camera and Spectrograph (MOIRCS) near-infrared spectroscopic follow-up to constrain the physical properties of SFGs in CL J1449+0856 and in a mass-matched field sample. After a conservative removal of active galactic nuclei, stacking individual MOIRCS spectra of 6 (31) sources in the cluster (field) in the mass range 10 <= log(M/M-circle dot) <= 11, we find a similar to 4 sigma. lower [N II]/H alpha ratio in the cluster than in the field. Stacking a subsample of 16 field galaxies with H beta and [O III] in the observed range, we measure an [O III]/H beta ratio fully compatible with the cluster value. Converting these ratios into metallicities, we find that the cluster SFGs are up to 0.25 dex poorer in metals than their field counterparts, depending on the adopted calibration. The low metallicity in cluster sources is confirmed using alternative indicators. Furthermore, we observe a significantly higher H alpha luminosity and equivalent width in the average cluster spectrum than in the field. This is likely due to the enhanced specific star formation rate; even if lower dust reddening and/or an uncertain environmental dependence on. the continuum-to-nebular emission differential reddening may play a role. Our findings might be explained by the accretion of pristine gas around galaxies at z = 2 and from cluster-scale reservoirs, possibly connected with a phase of rapid halo mass assembly at z > 2 and of a high galaxy merging rate.</P>
The Kormendy relation of galaxies in the Frontier Fields clusters: Abell S1063 and MACS J1149.5+2223
Tortorelli, Luca,Mercurio, Amata,Paolillo, Maurizio,Rosati, Piero,Gargiulo, Adriana,Gobat, Raphael,Balestra, Italo,Caminha, G B,Annunziatella, Marianna,Grillo, Claudio,Lombardi, Marco,Nonino, Mario,Re Oxford University Press 2018 Monthly notices of the Royal Astronomical Society Vol.477 No.1
Kinematics of the SN Refsdal host revealed by MUSE: a regularly rotating spiral galaxy at z ≃ 1.5
Di Teodoro, E M,Grillo, C,Fraternali, F,Gobat, R,Karman, W,Mercurio, A,Rosati, P,Balestra, I,Caminha, G B,Caputi, K I,Lombardi, M,Suyu, S H,Treu, T,Vanzella, E Oxford University Press 2018 Monthly notices of the Royal Astronomical Society Vol.476 No.1