Growing up in a megalopolis : environmental effects on galaxy evolution in a supercluster at z similar to 0.65 in UKIDSS UDS

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Galametz , A , Pentericci , L , Castellano , M , Mendel , T , Hartley , W G , Fossati , M , Finoguenov , A , Almaini , O , Beifiori , A , Fontana , A , Grazian , A , Scodeggio , M & Kocevski , D D 2018 , ' Growing up in a megalopolis : environmental effects on galaxy evolution in a supercluster at z similar to 0.65 in UKIDSS UDS ' , Monthly Notices of the Royal Astronomical Society , vol. 475 , no. 3 , pp. 4148-4169 . https://doi.org/10.1093/mnras/sty095

Title: Growing up in a megalopolis : environmental effects on galaxy evolution in a supercluster at z similar to 0.65 in UKIDSS UDS
Author: Galametz, Audrey; Pentericci, Laura; Castellano, Marco; Mendel, Trevor; Hartley, Will G.; Fossati, Matteo; Finoguenov, Alexis; Almaini, Omar; Beifiori, Alessandra; Fontana, Adriano; Grazian, Andrea; Scodeggio, Marco; Kocevski, Dale D.
Contributor: University of Helsinki, Department of Physics
Date: 2018-04
Language: eng
Number of pages: 22
Belongs to series: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
URI: http://hdl.handle.net/10138/308045
Abstract: We present a large-scale galaxy structure C1 J021734-0513 at z similar to 0.65 discovered in the UKIDSS UDS field, made of similar to 20 galaxy groups and clusters, spreading over 10 Mpc. We report on a VLT/VIMOS spectroscopic follow-up program that, combined with past spectroscopy, allowed us to confirm four galaxy clusters (M-200 similar to 10(14) M-circle dot) and a dozen associated groups and star-forming galaxy overdensities. Two additional filamentary structures at z similar to 0.62 and 0.69 and foreground and background clusters at 0.6 <z <0.7 were also confirmed along the line of sight. The structure subcomponents are at different formation stages. The clusters have a core dominated by passive galaxies and an established red sequence. The remaining structures are a mix of star-forming galaxy overdensities and forming groups. The presence of quiescent galaxies in the core of the latter shows that 'pre-processing' has already happened before the groups fall into their more massive neighbours. Our spectroscopy allows us to derive spectral index measurements e.g. emission/absorption line equivalent widths, strength of the 4000 angstrom break, valuable to investigate the star formation history of structure members. Based on these line measurements, we select a population of 'post-starburst' galaxies. These galaxies are preferentially found within the virial radius of clusters, supporting a scenario in which their recent quenching could be prompted by gas stripping by the dense intracluster medium. We derive stellar age estimates using Markov Chain Monte Carlo-based spectral fitting for quiescent galaxies and find a correlation between ages and colours/stellar masses which favours a top-down formation scenario of the red sequence. A catalogue of similar to 650 redshifts in UDS is released alongside the paper (via MNRAS online data).
Subject: galaxies: clusters: individual: C1 J021734-0513
large-scale structure of Universe
DIGITAL-SKY-SURVEY
STAR-FORMATION RATES
NEWTON-DEEP-FIELD
LARGE-SCALE STRUCTURES
EARLY DATA RELEASE
RED-SEQUENCE
CL-1604 SUPERCLUSTER
SPECTROSCOPIC SURVEY
SATELLITE GALAXIES
FORMATION HISTORY
115 Astronomy, Space science
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