Growing up in a megalopolis: Environmental effects on galaxy evolution in a supercluster at z ~ 0.65 in UKIDSS UDS
| Autor: | Will Hartley, Marco Scodeggio, Audrey Galametz, Alexis Finoguenov, Marco Castellano, Alessandra Beifiori, Dale D. Kocevski, Omar Almaini, Trevor Mendel, Laura Pentericci, Andrea Grazian, Matteo Fossati, Adriano Fontana |
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| Přispěvatelé: | Galametz, A, Pentericci, L, Castellano, M, Mendel, T, Hartley, W, Fossati, M, Finoguenov, A, Almaini, O, Beifiori, A, Fontana, A, Grazian, A, Scodeggio, M, Kocevski, D, Department of Physics |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
SPECTROSCOPIC SURVEY
Cosmology and Nongalactic Astrophysics (astro-ph.CO) Large-scale structure of Universe EARLY DATA RELEASE CL-1604 SUPERCLUSTER FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics STAR-FORMATION RATES 01 natural sciences NEWTON-DEEP-FIELD Galaxy groups and clusters Supercluster SATELLITE GALAXIES Intracluster medium 0103 physical sciences Galaxy formation and evolution Satellite galaxy RED-SEQUENCE 010303 astronomy & astrophysics Galaxy cluster Astrophysics::Galaxy Astrophysics galaxies: clusters: individual: C1 J021734-0513 Physics FORMATION HISTORY 010308 nuclear & particles physics Star formation DIGITAL-SKY-SURVEY Astronomy and Astrophysics LARGE-SCALE STRUCTURES 115 Astronomy Space science Astrophysics - Astrophysics of Galaxies Galaxy Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Galaxies: clusters: individual: Cl J021734-0513 Astrophysics - Cosmology and Nongalactic Astrophysics |
| ISSN: | 0035-8711 1365-2966 |
| Popis: | We present a large-scale galaxy structure Cl J021734-0513 at z~0.65 discovered in the UKIDSS UDS field, made of ~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 (M200 ~ 10^14 Msol) and a dozen associated groups and star-forming galaxy overdensities. Two additional filamentary structures at z ~ 0.62 and z ~ 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 `preprocessing' 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 4000A break, valuable to investigate the star formation history of structure members. Based on these line measurements, we select a population of `poststarburst' 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 MCMC-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 ~650 redshifts in UDS will be released alongside the paper. 23 pages, 19 figures, 4 tables, accepted for publication in MNRAS. A catalogue of ~650 VIMOS spectroscopic redshifts in UKIDSS UDS will be released alongside the paper. Feel free to contact the authors for early access to the catalogue |
| Databáze: | OpenAIRE |
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