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

Abstract

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 (PDFs) 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 centers when compared to blue galaxy ones. In addition, distinct group center definitions are used to show that our results are insensitive to center 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.

14 pages, Accepted to MNRAS

References in corpus (13)

• K-corrections and filter transformations in the ultraviolet, optical, and near infrared
• zCOSMOS: A Large VLT/VIMOS redshift survey covering 0 < z < 3 in the COSMOS field
• The DEEP2 Galaxy Redshift Survey: The Role of Galaxy Environment in the Cosmic Star-Formation History
• The effects of environment on morphological evolution between 0<z<1.2 in the COSMOS Survey
• Galaxy Colour, Morphology, and Environment in the Sloan Digital Sky Survey
• Galaxy And Mass Assembly (GAMA): The mechanisms for quiescent galaxy formation at $z<1$
• The Physical Origins of The Morphology-Density Relation: Evidence for Gas Stripping from the SDSS
• Halo Histories vs. Galaxy Properties at z=0, I: The Quenching of Star Formation
• Groups of galaxies: relationship between environment and galaxy properties
• Galaxy clustering with photometric surveys using PDF redshift information
• Reconstructing the galaxy density field with photometric redshifts: II. Environment-dependent galaxy evolution since $z\simeq 3$
• Measuring galaxy environment with the synergy of future photometric and spectroscopic surveys
• Dissecting galaxy triplets in the Sloan Digital Sky Survey Data Release 10: I. Stellar populations and emission line analysis

Cited by in corpus (3)

• The Southern Photometric Local Universe Survey (S-PLUS): improved SEDs, morphologies and redshifts with 12 optical filters
• Protocluster detection in simulations of HSC-SSP and the 10-year LSST forecast, using PCcones
• Subaru Hyper Suprime-Cam revisits the large-scale environmental dependence on galaxy morphology over 360 deg${}^2$ at z=0.3-0.6