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We present STEEL a STatistical sEmi-Empirical modeL designed to probe the distribution of satellite galaxies in groups and clusters. Our fast statistical methodology relies on tracing the abundances of central and satellite haloes via their…

Astrophysics of Galaxies · Physics 2018-12-04 P. J. Grylls , F. Shankar , L. Zanisi , M. Bernardi

Upcoming imaging surveys, such as the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST), will enable high signal-to-noise measurements of galaxy clustering. The halo occupation distribution (HOD) is a widely used framework to…

Cosmology and Nongalactic Astrophysics · Physics 2026-03-03 P. Cataldi , V. Cristiani , F. Rodriguez , A. Taverna , M. C. Artale , B. Levine , the LSST Dark Energy Science Collaboration

The spatial distribution of massive and luminous galaxies have provided important constraints on the fundamental cosmological parameters and physical processes governing galaxy formation. In this work, we construct and compare independent…

Cosmology and Nongalactic Astrophysics · Physics 2025-10-15 Zhongxu Zhai , Andrew Benson , Yun Wang

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…

A very large dynamic range with simultaneous capture of both large- and small-scales in the simulations of cosmic structures is required for correct modelling of many cosmological phenomena, particularly at high redshift. This is not always…

Cosmology and Nongalactic Astrophysics · Physics 2020-04-15 Ainulnabilah Nasirudin , Ilian T. Iliev , Kyungjin Ahn

The fraction of galaxies with red colours depends sensitively on environment, and on the way in which environment is measured. To distinguish competing theories for the quenching of star formation, a robust and complete description of…

Cosmology and Nongalactic Astrophysics · Physics 2013-12-06 Stefanie Phleps , David J. Wilman , Stefano Zibetti , Tamás Budavári

We present measurements of galaxy clustering at redshift <z>=0.6 using 10360 galaxies with photometric redshifts over an area of 0.78 square degree from the COMBO-17 survey. To obtain a result that is unaffected by redshift uncertainties,…

Astrophysics · Physics 2009-11-11 S. Phleps , J. A. Peacock , K. Meisenheimer , C. Wolf

We perform halo occupation distribution (HOD) modeling of the projected two-point correlation function (2PCF) of high-redshift (z~1.2) X-ray-bright active galactic nuclei (AGN) in the XMM-COSMOS field measured by Allevato et al. The HOD…

Cosmology and Nongalactic Astrophysics · Physics 2018-11-22 Jonathan W. Richardson , Suchetana Chatterjee , Zheng Zheng , Adam Myers , Ryan C. Hickox

Observationally, the fraction of blue satellite galaxies decreases steeply with host halo mass, and their radial distribution around central galaxies is significantly shallower in massive (M_* >10e11M_sun) than in Milky Way like systems.…

Galaxies are believed to be in one-to-one correspondence with simulated dark matter subhalos. We use high-resolution N-body simulations of cosmological volumes to calculate the statistical properties of subhalo (galaxy) major mergers at…

Astrophysics · Physics 2009-11-13 Andrew R. Wetzel , J. D. Cohn , Martin White

Halo models and halo occupation distributions (HODs) are important tools to model the galaxy and matter distribution. We present and assess a new method for constraining the parameters of HODs using the gravitational lensing shear around…

Astrophysics of Galaxies · Physics 2022-09-14 Laila Linke , Patrick Simon , Peter Schneider , Daniel J. Farrow , Jens Rödiger , Angus H. Wright

We model the luminosity-dependent projected two-point correlation function of DEEP2 (z~1) and SDSS (z~0) galaxies within the Halo Occupation Distribution (HOD) framework. At both epochs, there is a tight correlation between central galaxy…

Astrophysics · Physics 2008-11-26 Zheng Zheng , Alison L. Coil , Idit Zehavi

We investigate the clustering and halo occupation distribution (HOD) of DESI Y1 emission-line (ELGs) and luminous red (LRGs) galaxies at $0.8<z<1.1$, including their cross-correlation (ELG$\times$LRG), using the AbacusSummit suite and a new…

Understanding the connection between galaxies and dark matter halos is a central challenge in modern cosmology. The Halo Occupation Distribution (HOD) framework provides a widely used statistical description of how galaxies populate dark…

Cosmology and Nongalactic Astrophysics · Physics 2026-05-28 Antoine Rocher

We present a Halo Occupation Distribution (HOD) analysis of the luminosity- and colour-dependent galaxy clustering in the Sloan Digital Sky Survey. A novelty of our technique is that it uses a combination of clustering measurements in…

Cosmology and Nongalactic Astrophysics · Physics 2019-07-10 Niladri Paul , Isha Pahwa , Aseem Paranjape

We use the TNG300 magneto-hydrodynamic simulation and mock catalogues built using subhalo abundance matching (SHAM) to study the origin of the redshift evolution of the halo occupation distribution (HOD). We analyse stellar-mass selected…

Cosmology and Nongalactic Astrophysics · Physics 2023-08-11 Sergio Contreras , Idit Zehavi

The evolution of halos with masses around $M_\textrm{h} \approx 10^{11}\; \textrm{M}_\odot$ and $M_\textrm{h} \approx 10^{12}\; \textrm{M}_\odot$ at redshifts $z>9$ is examined using constrained N-body simulations. {The average specific…

Astrophysics of Galaxies · Physics 2024-08-15 Adi Nusser