Taking advantage of photometric galaxy catalogues to determine the halo occupation distribution

Abstract

Context. Halo occupation distribution (HOD) is a powerful statistic that allows the study of several aspects of the matter distribution in the Universe, such as evaluating semi-analytic models of galaxy formation or imposing constraints on cosmological models. Consequently, it is important to have a reliable method for estimating this statistic, taking full advantage of the available information on current and future galaxy surveys. Aims. The main goal of this project is to combine photometric and spectroscopic information using a discount method of background galaxies in order to extend the range of absolute magnitudes and to increase the upper limit of masses in which the HOD is estimated. We also evaluate the proposed method and apply it to estimating the HOD on the Sloan Digital Sky Survey Data Release 7 (SDSS DR7) galaxy survey. Methods. We propose the background subtraction technique to mel information provided by spectroscopic galaxy groups and photometric survey of galaxies. To evaluate the feasibility of the method, we implement the proposed technique on a mock catalogue built from a semi-analytic model of galaxy formation. Furthermore, we apply the method to the SDSS DR7 using a galaxy group catalogue taken from spectroscopic version and the corresponding photometric galaxy survey. Results. We demonstrated the validity of the method using the mock catalogue.We applied this technique to obtain the SDSS DR7 HOD in absolute magnitudes ranging from $M=-21.5$ to $M=-16.0$ and masses up to $\simeq 10^{15}{M}_{\odot }$ throughout this range. On the brighter extreme, we found that our results are in excellent agreement with those obtained in previous works.

8 pages, 6 figures

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• Galaxy Groups in the SDSS DR4: I. The Catalogue and Basic Properties
• Galaxy Groups in the SDSS DR4: II. halo occupation statistics
• Towards a Concordant Model of Halo Occupation Statistics
• Satellite abundances around bright isolated galaxies
• SDSS Galaxy Clustering: Luminosity & Colour Dependence and Stochasticity
• Evidence for merging or disruption of red galaxies from the evolution of their clustering

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• MultiDarkLens Simulations: weak lensing light-cones and data base presentation
• Deviations from tidal torque theory: evolution of the halo spin-filament alignment
• The galaxy size - halo mass scaling relations and clustering properties of central and satellite galaxies
• How galaxies populate haloes in very low-density environments? An analysis of the Halo Occupation Distribution in cosmic voids
• SDSS-IV MaNGA: Signatures of halo assembly in kinematically misaligned galaxies
• Identifying galaxy groups at high redshift from incomplete spectroscopic data: I. The group finder and application to zCOSMOS
• How do galaxies populate halos in extreme density environments? An analysis of the Halo Occupation Distribution in SDSS
• On the weak lensing masses of a new sample of galaxy groups
• Weak lensing measurement of the mass-richness relation using the SDSS database
• Galaxy populations in haloes in high-density environments
• Weak lensing analysis of galaxy pairs using CS82 data
• The PAU Survey: Close galaxy pairs identification and analysis
• Structure and large scale environment of galaxy pairs in the S-PLUS DR4
• The evolution of the halo occupation distribution in cosmic voids