Effect of richness on AGN and star formation activities in SDSS galaxy groups

Abstract

Based on a large sample of 254 220 galaxies in 81 089 groups, which are selected from the spectroscopic galaxy sample of the SDSS DR12, we investigate the radial distribution of incidences, morphologies, environmental densities, and star formation properties of the active galactic nucleus (AGN) host galaxies and star-forming galaxies (SFGs) in the groups at z<0.2, as well as their changes with group richness ($N_{\mathrm{rich}}$). It is found that AGN fraction slightly declines with richness for the groups/clusters. The SFG fraction is on average about 2 times larger than the AGN fraction, with a significant declining trend with richness. The group AGNs are preferentially reside in spheroidal and bulge-dominated disc galaxies, whereas the majority of SFGs are late-type discs. Compared with the SFGs, the AGNs in poor groups ($5⩽N_{\mathrm{rich}}⩽10$) are closer to group center. The AGN fraction does not change with the distance to the group center, whereas the SFG fraction tends to be higher in the outskirts. The AGNs in groups have a higher incidence than the SFGs for the massive ($\log (M_{\ast }/M_{\odot })>10.7$) galaxies, and the mean SFG fraction is about 6 times as that of AGNs in the late-type galaxies with lower masses at larger radius. The distribution of environmental luminosity densities shows that the AGNs are likely to be reside in a denser environment relative to the SFGs. Compared with the SFGs in groups, the group AGNs are found to have a higher mean stellar mass, a lower mean star formation rate, and an older mean stellar age.

13 pages, 10 figures, 2 tables, accepted by MNRAS

References in corpus (37)

• Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
• The Herschel view of the dominant mode of galaxy growth from z=4 to the present day
• Galaxy Zoo 1 : Data Release of Morphological Classifications for nearly 900,000 galaxies
• From rings to bulges: evidence for rapid secular galaxy evolution at z~2 from integral field spectroscopy in the SINS survey
• The Luminosity Function of X-ray Selected Active Galactic Nuclei: Evolution of Supermassive Black Holes at High Redshift
• Evidence for Quasar Activity Triggered by Galaxy Mergers in HST Observations of Dust-reddened Quasars
• Merging and Clustering of the Swift BAT AGN Sample
• The VIMOS VLT Deep Survey: The build-up of the colour-density relation
• Witnessing galaxy preprocessing in the local Universe: the case of a star-bursting group falling into Abell 1367
• The Assembly of Galaxy Clusters
• Ram pressure feeding super-massive black holes
• Fueling AGN II: Spatially Resolved Molecular Inflows and Outflows
• A Catalogue of Morphologically Classified Galaxies from the Sloan Digital Sky Survey: North Equatorial Region
• The host galaxies of luminous quasars
• AGNs and galaxy interactions
• A robust morphological classification of high-redshift galaxies using support vector machines on seeing limited images. I Method description
• AEGIS: Host Galaxy Morphologies of X-ray and Infrared-selected AGN at 0.2 < z < 1.2
• Interactions, star formation and AGN activity
• The Evolution of Active Galactic Nuclei in Clusters of Galaxies to Redshift 1.3
• The Distribution of AGN in Clusters of Galaxies
• The stripping of a galaxy group diving into the massive cluster A2142
• The AGN fraction - velocity dispersion relation in clusters of galaxies
• Dust-Corrected Colors Reveal Bimodality in AGN Host Galaxy Colors at z~1
• Galaxy And Mass Assembly: The 1.4GHz SFR indicator, SFR-M* relation and predictions for ASKAP-GAMA
• First Measurement of a Rapid Increase in the AGN Fraction in High-Redshift Clusters of Galaxies
• Triggering optical AGN: the need for cold gas, and the indirect roles of galaxy environment and interactions
• Properties of galaxies in SDSS Quasar environments at z < 0.2
• NoSOCS in SDSS. VI. The Environmental Dependence of AGN in Clusters and Field in the Local Universe
• Triggering Active Galactic Nuclei in galaxy clusters
• X-ray selected AGN in groups at redshifts z~1
• A robust morphological classification of high-redshift galaxies using support vector machines on seeing limited images. II. Quantifying morphological k-correction in the COSMOS field at 1<z<2: Ks band vs. I band
• The peculiar radio galaxy 4C 35.06: a case for recurrent AGN activity?
• OTELO Survey: Deep BVRI broadband photometry of the Groth strip. II Properties of X-ray Emitters
• Galaxy And Mass Assembly (GAMA): The effect of galaxy group environment on active galactic nuclei
• A $Chandra-Swift$ View of Point Sources in Hickson Compact Groups: High AGN fraction but a dearth of strong AGNs
• The Role of Host Galaxy for the Environmental Dependence of Active Nuclei in Local Galaxies
• Fraction of the X-ray selected AGNs with optical emission lines in galaxy groups

Cited by in corpus (4)

• The Dependence of AGN Activity on Environment in SDSS
• The effect of environment on AGN activity: the properties of radio and optical AGN in void, isolated and group galaxies
• The Relative Role of Bars and Environments in AGN Triggering
• GLACE survey: galaxy activity in ZwCl0024+1652 cluster from strong optical emission lines