Pseudo bulges in galaxy groups: the role of environment in secular evolution
arXiv:1701.07641 · doi:10.1093/mnras/stx247
Abstract
We examine the dependence of the fraction of galaxies containing pseudo bulges on environment for a flux limited sample of 5000 SDSS galaxies. We have separated bulges into classical and pseudo bulge categories based on their position on the Kormendy diagram. Pseudo bulges are thought to be formed by internal processes and are a result of secular evolution in galaxies. We attempt to understand the dependence of secular evolution on environment and morphology. Dividing our sample of disc+bulge galaxies based on group membership into three categories: central and satellite galaxies in groups and isolated field galaxies, we find that pseudo bulge fraction is almost equal for satellite and field galaxies. Fraction of pseudo bulge hosts in central galaxies is almost half of the fraction of pseudo bulges in satellite and field galaxies. This trend is also valid when only galaxies are considered only spirals or S0. Using the projected fifth nearest neighbour density as measure of local environment, we look for the dependence of pseudo bulge fraction on environmental density. Satellite and field galaxies show very weak or no dependence of pseudo bulge fraction on environment. However, fraction of pseudo bulges hosted by central galaxies decreases with increase in local environmental density. We do not find any dependence of pseudo bulge luminosity on environment. Our results suggest that the processes that differentiate the bulge types are a function of environment while processes responsible for the formation of pseudo bulges seem to be independent of environment.
arXiv comment8 pages, 7 figures, to appear in the MNRAS
References in corpus (33)
- Stellar Masses and Star Formation Histories for 10^5 Galaxies from the Sloan Digital Sky Survey
- Cold streams in early massive hot haloes as the main mode of galaxy formation
- Secular Evolution and the Formation of Pseudobulges in Disk Galaxies
- Galaxy Groups in the SDSS DR4: I. The Catalogue and Basic Properties
- Differential Galaxy Evolution in Cluster and Field Galaxies at z=0.3
- Structure and Formation of Elliptical and Spheroidal Galaxies
- Galaxy bimodality versus stellar mass and environment
- Galaxy Zoo 1 : Data Release of Morphological Classifications for nearly 900,000 galaxies
- Structural Properties of Pseudo-Bulges, Classical Bulges and Elliptical Galaxies: an SDSS Perspective
- A Catalog of Detailed Visual Morphological Classifications for 14034 Galaxies in the Sloan Digital Sky Survey
- The Structure of Classical Bulges And Pseudobulges: The Link Between Pseudobulges And Sersic Index
- Spiral galaxies with WFPC2: II. The Nuclear Properties of 40 objects
- Supermassive black holes do not correlate with galaxy disks or pseudobulges
- Bulges Of Nearby Galaxies With Spitzer: Scaling Relations in Pseudobulges and Classical Bulges
- A catalogue of 2D photometric decompositions in the SDSS-DR7 spectroscopic main galaxy sample: preferred models and systematics
- Image Decomposition of Barred Galaxies and AGN Hosts
- Growth of Galactic Bulges by Mergers: I. Dense Satellites
- Composite Bulges: The Coexistence of Classical Bulges and Disky Pseudobulges in S0 and Spiral Galaxies
- Balance among gravitational instability, star formation, and accretion determines the structure and evolution of disk galaxies
- Demographics of Bulge Types within 11 Mpc and Implications for Galaxy Evolution
- Evolution of violent gravitational disc instability in galaxies: Late stabilization by transition from gas to stellar dominance
- Kinematic Signatures of Bulges Correlate with Bulge Morphologies and Sérsic Index
- PyMorph: Automated Galaxy Structural Parameter Estimation using Python
- The growth of supermassive black holes in pseudo-bulges, classical bulges and elliptical galaxies
- An Observational Guide to Identifying Pseudobulges and Classical Bulges in Disk Galaxies
- Elliptical Galaxies and Bulges of Disk Galaxies: Summary of Progress and Outstanding Issues
- Central Star Formation in Pseudobulges and Classical Bulges
- A Catalogue of Two-Dimensional Photometric Decompositions in the SDSS-DR7 Spectroscopic Main Galaxy Sample: Extension to g- and i-Bands
- Photometric characterization of a well defined sample of isolated galaxies in the context of the AMIGA project
- Colours of Bulges and Discs within Galaxy Clusters and the Signature of Disc Fading on Infall
- The Effect of Environment on Discs and Bulges
- Spiral Galaxies as Progenitors of Pseudobulge Hosting S0s
- Red galaxies with pseudo-bulges in the SDSS: closer to disk galaxies or to classical bulges?
Cited by in corpus (7)
- No evidence for small disk-like bulges in a sample of late-type spirals
- On the observational diagnostics to separate classical and disk-like bulges
- Synergies between low- and intermediate-redshift galaxy populations revealed with unsupervised machine learning
- Why are classical bulges more common in S0 galaxies than in spiral galaxies?
- Age bimodality in the central region of pseudobulges in S0 galaxies
- Connecting galaxy structure and star formation: the role of environment in formation of S0 galaxies
- The clustering of galaxies with pseudo bulge and classical bulge in the local Universe