Chiaki Hikage, Kazuhiro Yamamoto
We study the impacts of the satellite galaxies in a measurement of the redshift-space distortions. In our multipole power spectrum analysis of the luminous red galaxies (LRGs) samples in the Sloan digital sky survey (SDSS), we have clearly detected the non-zero signature of the hexadecapole and tetrahexadecapole spectrum, which disappears in the power spectrum with the sample with the brightest LRGs only. We thus demonstrate that the satellite LRGs in multiple systems significantly contribute 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 effect from the satellite galaxies, is the main source of the higher multipole spectra. We also discuss about a prospect for the contribution of satellite galaxies in future large redshift surveys targeting the H-alpha emitters.
View original:
http://arxiv.org/abs/1303.3380
No comments:
Post a Comment