Impacts of satellite galaxies on the redshift-space distortions
  We study the impacts of the satellite galaxies on the redshift-space
distortions. In our multipole power spectrum analysis of the luminous red
galaxies (LRGs) samples of the Sloan Digital Sky Survey (SDSS), we have clearly
detected the non-zero signature of the hexadecapole and tetrahexadecapole
spectrum, which almost disappears in the power spectrum with the sample of the
brightest LRGs only. We thus demonstrate that the satellite LRGs in multiple
systems make a significant contribution to the multipole power spectrum though
its fraction is small. The behavior can be understood by a simple halo model,
in which the one-halo term, describing the Finger of God (FoG) effect from the
satellite galaxies, makes the dominant contribution to the higher multipole
spectra. We demonstrate that the small-scale information of higher multipole
spectrum is useful for calibrating the satellite FoG effect and improves the
measurement of the cosmic growth rate dramatically. We further demonstrate that
the fiber collision in the galaxy survey influences the one-halo term and the
higher multipole spectra, because the number of satellite galaxies in the halo
occupation distribution (HOD) is changed. We also discuss about the impact of
satellite galaxies on future high-redshift surveys targeting the H-alpha
emitters.
