A New Test of the Statistical Nature of the Brightest Cluster Galaxies

Abstract

A novel statistic is proposed to examine the hypothesis that all cluster galaxies are drawn from the same luminosity distribution (LD). In such a "statistical model" of galaxy LD, the brightest cluster galaxies (BCGs) are simply the statistical extreme of the galaxy population. Using a large sample of nearby clusters, we show that BCGs in high luminosity clusters (e.g., L_tot > 4x10^11 L_sun) are unlikely (probability <3x10^-4) to be drawn from the LD defined by all red cluster galaxies more luminous than M_r=-20. On the other hand, BCGs in less luminous clusters are consistent with being the statistical extreme. Applying our method to the second brightest galaxies, we show that they are consistent with being the statistical extreme, which implies that the BCGs are also distinct from non-BCG luminous, red, cluster galaxies. We point out some issues with the interpretation of the classical tests proposed by Tremaine & Richstone (1977) that are designed to examine the statistical nature of BCGs, investigate the robustness of both our statistical test and those of TR against difficulties in photometry of galaxies of large angular size, and discuss the implication of our findings on surveys that use the luminous red galaxies to measure the baryon acoustic oscillation features in the galaxy power spectrum.

12 pages, 8 figures, 4 tables; published in ApJ

References in corpus (18)

• The Seventh Data Release of the Sloan Digital Sky Survey
• The hierarchical formation of the brightest cluster galaxies
• The Fifth Data Release of the Sloan Digital Sky Survey
• The Masses of Nuclear Black Holes in Luminous Elliptical Galaxies and Implications for the Space Density of the Most Massive Black Holes
• The Clustering of Luminous Red Galaxies in the Sloan Digital Sky Survey Imaging Data
• How special are Brightest Group and Cluster Galaxies?
• Galaxy Groups in the SDSS DR4: II. halo occupation statistics
• The Galaxy Content of SDSS Clusters and Groups
• MaxBCG: A Red Sequence Galaxy Cluster Finder
• The luminosities, sizes and velocity dispersions of Brightest Cluster Galaxies: Implications for formation history
• Halo Occupation Distribution Modeling of Clustering of Luminous Red Galaxies
• Curvature in the scaling relations of early-type galaxies
• Structural Properties of Central Galaxies in Groups and Clusters
• Luminosity Dependence in the Fundamental Plane Projections of Elliptical Galaxies
• Photometric Properties and Scaling Relations of Early Type Brightest Cluster Galaxies
• On the Nature of Fossil Galaxy Groups: Are they really fossils ?
• Fossil Systems in the 400d Cluster Catalog
• Satellite Luminosities in Galaxy Groups

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• Multiple AGN activity during the BCG assembly of XDCPJ0044.0-2033 at z~1.6
• Distribution of Maximal Luminosity of Galaxies in the Sloan Digital Sky Survey
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• Multi-spin stellar velocity maps of the most massive galaxies
• Compact groups from semi-analytical models of galaxy formation -- VI: Evolution of the two first-ranked galaxies
• The Journey to Dominance: How BCGs Evolve Differently from Other Massive Galaxies
• SDSS-IV MaNGA: Cannibalism Caught in the Act -- on the Frequency of Occurrence of Multiple Cores in Brightest Cluster Galaxies