Bibcode
White, Martin; Zehavi, Idit; Wilcox, Harry; Viana, Pedro T. P.; Stott, John P.; Streblyanska, A.; Ross, Ashley J.; Schneider, Donald P.; Prada, Francisco; Miller, Christopher J.; Parejko, John K.; Mann, Robert G.; Masters, Karen; Hilton, Matt; Liddle, Andrew R.; Kay, Scott T.; Hoyle, Ben; Comparat, Johan; Christodoulou, L.; Capozzi, Diego; Bermeo-Hernandez, A.; Bristow, Martyn; Sahlén, Martin; Rooney, Philip J.; Mayers, Julian A.; Romer, A. Kathy; Nichol, Robert C.; Collins, Chris A.; Mehrtens, Nicola
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 463, Issue 2, p.1929-1943
Fecha de publicación:
12
2016
Número de citas
6
Número de citas referidas
6
Descripción
We present a direct measurement of the mean halo occupation distribution
(HOD) of galaxies taken from the eleventh data release (DR11) of the
Sloan Digital Sky Survey-III Baryon Oscillation Spectroscopic Survey
(BOSS). The HOD of BOSS low-redshift (LOWZ: 0.2 < z < 0.4) and
Constant-Mass (CMASS: 0.43 < z < 0.7) galaxies is inferred via
their association with the dark matter haloes of 174 X-ray-selected
galaxy clusters drawn from the XMM Cluster Survey (XCS). Halo masses are
determined for each galaxy cluster based on X-ray temperature
measurements, and range between
log10(M180/M⊙) = 13 and 15. Our
directly measured HODs are consistent with the HOD-model fits inferred
via the galaxy-clustering analyses of Parejko et al. for the BOSS LOWZ
sample and White et al. for the BOSS CMASS sample. Under the simplifying
assumption that the other parameters that describe the HOD hold the
values measured by these authors, we have determined a best-fitting
alpha-index of 0.91 ± 0.08 and 1.27^{+0.03}_{-0.04} for the CMASS
and LOWZ HOD, respectively. These alpha-index values are consistent with
those measured by White et al. and Parejko et al. In summary, our study
provides independent support for the HOD models assumed during the
development of the BOSS mock-galaxy catalogues that have subsequently
been used to derive BOSS cosmological constraints.