The galaxy environment in GAMA G3C groups using the Kilo Degree Survey Data Release 3

Autor(es):Mostrar menos -

Costa-Duarte, V, M. ; Viola, M. ^[1] ; Molino, A. ^[2] ; Kuijken, K. ^[1] ; Sodre Jr, L. ; Bilicki, M. ^{[1, 3]} ; Brouwer, M. M. ^[1] ; Buddelmeijer, H. ^[1] ; Getman, F. ^[4] ; Grado, A. ^[4] ; de Jong, J. T. A. ^[1] ; Kleijn, V, G. ; Napolitano, N. ^[4] ; Puddu, E. ^[4] ; Radovich, M. ^[5] ; Vakili, M. ^[1]

Afiliação do(s) autor(es)

^[1] Costa-Duarte, M., V, Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden - Netherlands

^[2] Costa-Duarte, M., V, Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, R Matao 1226, BR-05508090 Sao Paulo - Brazil

^[3] Natl Ctr Nucl Res, Astrophys Div, POB 447, PL-90950 Lodz - Poland

^[4] Osserv Astron Capodimonte, INAF, Via Moiariello 16, I-80131 Naples - Italy

^[5] Osserv Astron Padova, INAF, Via Osservatorio 5, I-35122 Padua - Italy

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 478, n. 2, p. 1968-1979, AUG 2018.
• Citações Web of Science: 3

Resumo

We aim to investigate the galaxy environment in GAMA Galaxy Groups Catalogue (G3C) using a volume-limited galaxy sample from the Kilo Degree Survey Data Release 3. The k-Nearest Neighbour technique is adapted to take into account the probability density functions of photometric redshifts in our calculations. This algorithm was tested on simulated KiDS tiles, showing its capability of recovering the relation between galaxy colour, luminosity, and local environment. The characterization of the galaxy environment in G3C groups shows systematically steeper density contrasts for more massive groups. The red galaxy fraction gradients in these groups is evident for most of group mass bins. The density contrast of red galaxies is systematically higher at group centres when compared to blue galaxy ones. In addition, distinct group centre definitions are used to show that our results are insensitive to centre definitions. These results confirm the galaxy evolution scenario which environmental mechanisms are responsible for a slow quenching process as galaxies fall into groups and clusters, resulting in a smooth observed colour gradients in galaxy systems. (AU)

• Processo FAPESP: 14/11806-9 - Desafios para a nova geração de mapeamentos fotométricos de grande campo como o J-PAS
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• Processo FAPESP: 16/05254-9 - Identificando aglomerados de galáxias no espaço de redshift fotométrico
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