Green Valley galaxies as a transition population in different environments

Abstract

We present a comparative analysis of the properties of passive, star-forming and transition (green valley) galaxies, in four discrete environments: field, groups, the outskirts and the core of X-ray clusters. We construct samples of galaxies from the SDSS in these environments so that they are bound to have similar redshift distributions. The classification of galaxies into the three sequences is based on the UV-optical colour $NUV-r$. We study a number of galaxy properties: stellar mass, morphology, specific star formation rate and the history of star formation. The analysis of green valley galaxies reveals that the physical mechanisms responsible for external quenching become more efficient moving from the field to denser environments. We confirm previous findings that green valley galaxies have intermediate morphologies, moreover, we find that this appears to be independent of the environment. Regarding the stellar mass of green valley galaxies, we find that they tend to be more massive in the field than in denser environments. On average, green valley galaxies account for $\sim 20\%$ of all galaxies in groups and X-ray clusters. We find evidence that the field environment is inefficient in transforming low mass galaxies. Green valley galaxies have average star formation histories intermediate between passive and star forming galaxies, and have a clear and consistent dependence on the environment: both, the quenching time, and the amplitude of the star formation rate, decrease towards higher density environments.

14 pages, 13 figures, 1 table. MNRAS accepted

References in corpus (17)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
• UV Star Formation Rates in the Local Universe
• The EAGLE simulations of galaxy formation: calibration of subgrid physics and model variations
• Galaxy Zoo 1 : Data Release of Morphological Classifications for nearly 900,000 galaxies
• Galaxy Zoo: the dependence of morphology and colour on environment
• Absorption Properties and Evolution of Active Galactic Nuclei
• The UV-Optical Color Magnitude Diagram II: Physical Properties and Morphological Evolution On and Off of a Star-Forming Sequence
• Strangulation in Galaxy Groups
• The Zurich Extragalactic Bayesian Redshift Analyzer (ZEBRA) and its first application: COSMOS
• AEGIS: The color-magnitude relation for X-ray selected AGN
• Recovering galaxy star formation and metallicity histories from spectra using VESPA
• The Evolution of AGN Host Galaxies: From Blue to Red and the Influence of Large-Scale Structures
• The role of minor mergers in the recent star formation history of early-type galaxies
• The Slow Death (or Rebirth?) of Extended Star Formation in z~0.1 Green Valley Early-Type Galaxies
• On the relationship between environment and galaxy properties in clusters of galaxies
• NUV signatures of environment driven galaxy quenching in SDSS groups

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• A detailed look at the stellar populations in green valley galaxies
• Star formation in far-IR AGN and non-AGN galaxies in the green valley. II. Morphological analysis
• Witnessing the star-formation quenching in $L_{\ast }$ ellipticals
• Reconstructing Orbits of Galaxies in Extreme Regions (ROGER) II: reliability of projected phase-space in our understanding of galaxy populations
• Stellar populations of a sample of far-IR AGN and non-AGN green valley galaxies
• The cold gas and dust properties of red star-forming galaxies