The Large-scale Effect of Environment on Galactic Conformity

Abstract

We use a volume-limited galaxy sample from the SDSS Data Release 7 to explore the dependence of galactic conformity on the large-scale environment, measured on $\sim$ 4 Mpc scales. We find that the star formation activity of neighbour galaxies depends more strongly on the environment than on the activity of their primary galaxies. In under-dense regions most neighbour galaxies tend to be active, while in over-dense regions neighbour galaxies are mostly passive, regardless of the activity of their primary galaxies. At a given stellar mass, passive primary galaxies reside in higher density regions than active primary galaxies, leading to the apparently strong conformity signal. The dependence of the activity of neighbour galaxies on environment can be explained by the corresponding dependence of the fraction of satellite galaxies. Similar results are found for galaxies in a semi-analytical model, suggesting that no new physics is required to explain the observed large-scale conformity.

arXiv comment9 pages, 9 figures, accepted by MNRAS

References in corpus (29)

• The Seventh Data Release of the Sloan Digital Sky Survey
• The physical properties of star forming galaxies in the low redshift universe
• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
• Galaxy Harassment and the Evolution of Clusters of Galaxies
• K-corrections and filter transformations in the ultraviolet, optical, and near infrared
• The epochs of early-type galaxy formation as a function of environment
• Properties of galaxies reproduced by a hydrodynamic simulation
• NYU-VAGC: a galaxy catalog based on new public surveys
• Resolving Cosmic Structure Formation with the Millennium-II Simulation
• Properties of Galaxy Groups in the SDSS: I.-- The Dependence of Colour, Star Formation, and Morphology on Halo Mass
• Ram Pressure Stripping of Spiral Galaxies in Clusters
• The age dependence of halo clustering
• Gone with the wind: the origin of S0 galaxies in clusters
• Physical properties and environments of nearby galaxies
• Mass and Environment as Drivers of Galaxy Evolution II: The quenching of satellite galaxies as the origin of environmental effects
• NOAO Fundamental Plane Survey -- II. Age and Metallicity along the Red Sequence
• Galaxy growth in the concordance $\Lambda$CDM cosmology
• Environmental Effects on Satellite Galaxies: The Link Between Concentration, Size and Colour Profile
• A Re-examination of Galactic Conformity and a Comparison with Semi-analytic Models of Galaxy Formation
• Satellite abundances around bright isolated galaxies
• Quenching of Star Formation in SDSS Groups: Centrals, Satellites, and Galactic Conformity
• Galaxy formation in the Planck cosmology - IV. Mass and environmental quenching, conformity and clustering
• Detection of galaxy assembly bias
• The Satellite Luminosity Functions of Galaxies in SDSS
• Halo Histories vs. Galaxy Properties at z=0 II: Large-Scale Galactic Conformity
• Mapping stellar content to dark matter halos - III.Environmental dependence and conformity of galaxy colours
• On the evidence for large-scale galactic conformity in the local Universe
• Physical origin of the large-scale conformity in the specific star formation rates of galaxies

Cited by in corpus (7)

• Baryons in the CosmicWeb of IllustrisTNG -- II: the Connection among Galaxies, Halos, their Formation Time and their Location in the Cosmic Web
• The Physical Origin of Galactic Conformity: From Theory to Observation
• On the environmental influence of groups and clusters of galaxies beyond the virial radius: Galactic conformity at few Mpc scales
• Dissect two-halo galactic conformity effect for central galaxies: The dependence of star formation activities on the large-scale environment
• The conformity of HI galaxies in ALFALFA-SDSS sample
• Assessing the connection between galactic conformity and assembly-type bias
• CosmoGLINT: Cosmological Generative Model for Line Intensity Mapping with Transformer