OMEGA -- OSIRIS Mapping of Emission-line Galaxies in A901/2: II. -- Environmental influence on integrated star formation properties and AGN activity

Abstract

We present a study of the star formation and AGN activity for galaxies in the Abell 901/2 multi-cluster system at z~0.167 as part of the OMEGA survey. Using Tuneable Filter data obtained with the OSIRIS instrument at the GTC we produce spectra covering the Halpha and [N II] spectral lines for more than 400 galaxies. Using optical emission-line diagnostics, we identify a significant number of galaxies hosting AGN, which tend to have high masses and a broad range of morphologies. Moreover, within the environmental densities probed by our study, we find no environmental dependence on the fraction of galaxies hosting AGN. The analysis of the integrated Halpha emission shows that the specific star formation rates (SSFRs) of a majority of the cluster galaxies are below the field values for a given stellar mass. We interpret this result as evidence for a slow decrease in the star formation activity of star-forming galaxies as they fall into higher-density regions, contrary to some previous studies which suggested a rapid truncation of star formation. We find that most of the intermediate- and high-mass spiral galaxies go through a phase in which their star formation is suppressed but still retain significant star-formation activity. During this phase, these galaxies tend to retain their spiral morphology while their colours become redder. The presence of this type of galaxies in high density regions indicates that the physical mechanism responsible for suppressing star-formation affects mainly the gas component of the galaxies, suggesting that ram-pressure stripping or starvation are potentially responsible.

arXiv comment20 pages, 16 figures. Accepted for publication in MNRAS

References in corpus (45)

• The Host Galaxies of AGN
• The physical properties of star forming galaxies in the low redshift universe
• Stellar Masses and Star Formation Histories for 10^5 Galaxies from the Sloan Digital Sky Survey
• Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
• Galaxy bimodality versus stellar mass and environment
• Cosmological simulations of the growth of supermassive black holes and feedback from active galactic nuclei: method and tests
• Galaxy Star-Formation as a Function of Environment in the Early Data Release of the Sloan Digital Sky Survey
• Relationship between environment and the broad-band optical properties of galaxies in the SDSS
• A comprehensive classification of galaxies in the SDSS: How to tell true from fake AGN?
• Galaxy Zoo: the dependence of morphology and colour on environment
• Strangulation as the primary mechanism for shutting down star formation in galaxies
• Alternative diagnostic diagrams and the "forgotten" population of weak line galaxies in the SDSS
• The Morphology-Density Relation in the Sloan Digital Sky Survey
• The Properties of Poor Groups of Galaxies: I. Spectroscopic Survey and Results
• SDSS IV MaNGA - Spatially resolved diagnostic diagrams: A proof that many galaxies are LIERs
• Passive spiral formation from halo gas starvation: Gradual transformation into S0s
• Semi-empirical analysis of Sloan Digital Sky Survey galaxies III. How to distinguish AGN hosts
• The Environment of AGNs in the Sloan Digital Sky Survey
• A Turnover in the Galaxy Main Sequence of Star Formation at $M_{\ast }\sim 10^{10}{M}_{\odot }$ for Redshifts $z<1.3$
• BUDHIES II: A phase-space view of HI gas stripping and star-formation quenching in cluster galaxies
• The STAGES view of red spirals and dusty red galaxies: Mass-dependent quenching of star-formation in cluster infall
• The SAMI Galaxy Survey: Shocks and Outflows in a normal star-forming galaxy
• The relation between star formation, morphology and local density in high redshift clusters and groups
• Galaxy stellar mass functions of different morphological types in clusters, and their evolution between z=0.8 and z=0
• Galaxy And Mass Assembly: Evolution of the Halpha luminosity function and star formation rate density up to z<0.35
• Spectroscopic Confirmation of a Large AGN Population in Clusters of Galaxies
• Obscured star formation in intermediate-density environments: A Spitzer study of the Abell 901/902 supercluster
• P-MaNGA: Emission Lines Properties - Gas Ionisation and Chemical Abundances from Prototype Observations
• The environmental dependence of the stellar mass-size relation in STAGES galaxies
• STAGES: the Space Telescope A901/2 Galaxy Evolution Survey
• The Origin of S0s in Clusters: evidence from the bulge and disc star formation histories
• Environmental dependence of AGN activity in the supercluster A901/2
• An H-alpha survey of the rich cluster A1689
• Morphological Fractions of Galaxies in WINGS Clusters: revisiting the Morphology-Density Paradigm
• Star formation in the massive cluster merger Abell 2744
• Retired galaxies: not to be forgotten in the quest of the star formation -- AGN connection
• Revealing components of the galaxy population through nonparametric techniques
• The environmental dependence of the structure of outer galactic discs in STAGES spiral galaxies
• A study of AGN and supernova feedback in simulations of isolated and merging disc galaxies
• The environmental dependence of the structure of galactic discs in STAGES S0 galaxies: implications for S0 formation
• Is the cluster environment quenching the Seyfert activity in elliptical and spiral galaxies?
• Caught in the act: Cluster `k+a' galaxies as a link between spirals and S0s
• General Formulation for the Calibration and Characterization of Narrow-gap Etalons: the OSIRIS/GTC Tunable Filters Case
• OMEGA -- OSIRIS Mapping of Emission-line Galaxies in A901/2: I.-- Survey description, data analysis, and star formation and AGN activity in the highest density regions
• Wavelength Self-Calibration and Sky Subtraction for Fabry-Perot Interferometers: Applications to OSIRIS

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• Galaxy evolution across environments as probed by the ages, stellar metallicities and [alpha/Fe] of central and satellite galaxies
• The GOGREEN survey: The environmental dependence of the star-forming galaxy main sequence at $1.0<z<1.5$
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• NoSOCS in SDSS. VI. The Environmental Dependence of AGN in Clusters and Field in the Local Universe
• OMEGA -- OSIRIS Mapping of Emission-line Galaxies in A901/2 -- V. The rich population of jellyfish galaxies in the multi-cluster system Abell 901/2
• SDSS-IV MaNGA: spatially resolved dust attenuation in spiral galaxies
• Galaxy cluster mergers as triggers for the formation of jellyfish galaxies: case study of the A901/2 system
• The Local Cluster Survey I: Evidence of Outside-In Quenching in Dense Environments
• OMEGA - OSIRIS Mapping of Emission-line Galaxies in A901/2: III. - Galaxy Properties Across Projected Phase Space in A901/2
• The effect of the environment on the structure, morphology and star-formation history of intermediate-redshift galaxies
• The Local Cluster Survey II: Disk-Dominated Cluster Galaxies with Suppressed Star Formation
• The evolution of galaxy scaling relations in clusters at 0.5<z<1.5
• OMEGA - OSIRIS Mapping of Emission-line Galaxies in A901/2: IV. - Extinction of Star-Formation Estimators with Inclination
• Investigating the Impacts of AGN Activities on Dwarf Galaxies with FAST HI Observations