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Title: Brightest galaxies as halo centre tracers in SDSS DR7

Journal Article · · Monthly Notices of the Royal Astronomical Society
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Determining the positions of halo centres in large-scale structure surveys is crucial for many cosmological studies. A common assumption is that halo centres correspond to the location of their brightest member galaxies. In this paper, we study the dynamics of brightest galaxies with respect to other halo members in the Sloan Digital Sky Survey DR7. Specifically, we look at the line-of-sight velocity and spatial offsets between brightest galaxies and their neighbours. We compare those to detailed mock catalogues, constructed from high-resolution, dark-matter-only N-body simulations, in which it is assumed that satellite galaxies trace dark matter subhaloes. This allows us to place constraints on the fraction f(BNC) of haloes in which the brightest galaxy is not the central. Compared to previous studies, we explicitly take into account the unrelaxed state of the host haloes, velocity offsets of halo cores and correlations between f(BNC) and the satellite occupation. We find that f(BNC) strongly decreases with the luminosity of the brightest galaxy and increases with the mass of the host halo. Overall, in the halo mass range 10(13-)10(14.5) h(-1) M-circle dot we find f(BNC) similar to 30 per cent, in good agreement with a previous study by Skibba et al. We discuss the implications of these findings for studies inferring the galaxy-halo connection from satellite kinematics, models of the conditional luminosity function and galaxy formation in general

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science - Office of High Energy Physics; National Science Foundation (NSF)
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1561089
Journal Information:
Monthly Notices of the Royal Astronomical Society, Vol. 473, Issue 2
Country of Publication:
United States
Language:
English

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Related Subjects

cosmology: dark matter
galaxies: groups: general
galaxies: kinematics and dynamics
methods: statistical