The nature of assembly bias - III. Observational properties

Abstract

We analyse galaxies in groups in the Sloan Digital Sky Survey (SDSS) and find a weak but significant assembly-type bias, where old central galaxies have a higher clustering amplitude (61 $\pm$ 9 per cent) at scales > 1 Mpc than young central galaxies of equal host halo mass ($M_h\sim 10^{11.8}{h}^{-1}$ $M_{\odot }$). The observational sample is volume-limited out to z=0.1 with $M_r-$ 5 log$(h)\le -19.6$. We construct a mock catalogue of galaxies that shows a similar signal of assembly bias (46 $\pm$ 9 per cent) at the same halo mass. We then adapt the model presented by Lacerna & Padilla (Paper I) to redefine the overdensity peak height, which traces the assembly bias such that galaxies in equal density peaks show the same clustering regardless of their stellar age, but this time using observational features such as a flux limit. The proxy for peak height, which is proposed as a better alternative than the virial mass, consists in the total mass given by the mass of neighbour host haloes in cylinders centred at each central galaxy. The radius of the cylinder is parametrized as a function of stellar age and virial mass. The best-fitting set of parameters that make the assembly bias signal lower than 5$-$15 per cent for both SDSS and mock central galaxies are similar. The idea behind the parametrization is not to minimize the bias, but it is to use this method to understand the physical features that produce the assembly bias effect. Even though the tracers of the density field used here differ significantly from those used in paper I, our analysis of the simulated catalogue indicates that the different tracers produce correlated proxies, and therefore the reason behind this assembly bias is the crowding of peaks in both simulations and the SDSS.

12 pages, 11 figures. Accepted for publication in MNRAS

References in corpus (20)

• Galaxy Groups in the SDSS DR4: I. The Catalogue and Basic Properties
• Assembly bias in the clustering of dark matter haloes
• Halo assembly bias and its effects on galaxy clustering
• Galaxy Groups in the SDSS DR4: II. halo occupation statistics
• A Halo Model of Galaxy Colors and Clustering in the SDSS
• A Re-examination of Galactic Conformity and a Comparison with Semi-analytic Models of Galaxy Formation
• Effects of AGN feedback on LCDM galaxies
• Environmental Dependence of Cold Dark Matter Halo Formation
• Metal Enrichment of the ICM: a 3-D Picture of Chemical and Dynamical Properties
• Error analysis in cross-correlation of sky maps: application to the ISW detection
• Detection of galaxy assembly bias
• Galaxy interactions II: High density environments
• The nature of assembly bias - I. Clues from a LCDM cosmology
• The nature of assembly bias - II. Halo spin
• The Effects of Halo Assembly Bias on Self-Calibration in Galaxy Cluster Surveys
• The influence of halo assembly on galaxies and galaxy groups
• Are Halo and Galaxy Formation Histories Correlated?
• The effects of halo alignment and shape on the clustering of galaxies
• On the scatter in the relation between stellar mass and halo mass: random or halo formation time dependent?
• Assembly Bias of Dwarf-sized Dark Matter Haloes

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