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We present an estimate of the projected two-point correlation function (2PCF) of quasars in the Sloan Digital Sky Survey (SDSS) over the full range of one- and two-halo scales, 0.02-120 Mpc/h. This was achieved by combining data from SDSS…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-04 Jonathan Richardson , Zheng Zheng , Suchetana Chatterjee , Daisuke Nagai , Yue Shen

We model the projected angular two-point correlation function (2PCF) of obscured and unobscured quasars selected using the Wide-field Infrared Survey Explorer (WISE), at a median redshift of $z \sim 1$ using a five-parameter Halo Occupation…

Astrophysics of Galaxies · Physics 2018-11-22 Kaustav Mitra , Suchetana Chatterjee , Michael A. DiPompeo , Adam D. Myers , Zheng Zheng

We combine the most precise small scale ($< 100\, \rm h^{-1}kpc$) quasar clustering constraintsto date with recent measurements at large scales ($> 1\, \rm h^{-1}Mpc$) from the extended Baryon Oscillation Spectroscopic Survey (eBOSS) to…

Cosmology and Nongalactic Astrophysics · Physics 2020-02-04 S. Eftekharzadeh , A. D. Myers , E. Kourkchi

We use cosmological hydrodynamic simulations (IllustrisTNG and SIMBA) to explore the redshift, luminosity, and black hole mass dependence of the quasar halo occupation distribution (HOD). In both simulations, we find that the quasar…

Cosmology and Nongalactic Astrophysics · Physics 2025-08-14 Anirban Chowdhary , Suchetana Chatterjee

We measure the small-scale (comoving separation 10 kpc/h < r_p < 200 kpc/h) two-point correlation function of quasars using a sample of 26 spectroscopically confirmed binary quasars at 0.6<z<2.2 from the Sloan Digital Sky Survey Quasar Lens…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-04 Issha Kayo , Masamune Oguri

We analyze the halo occupation distribution (HOD), the probability for a halo of mass M to host a number of subhalos N, and two-point correlation function of galaxy-size dark matter halos using high-resolution dissipationless simulations of…

We use the projected correlation function w_p(r_p) of a volume-limited subsample of the Sloan Digital Sky Survey (SDSS) main galaxy redshift catalogue to measure the halo occupation distribution (HOD) of the galaxies of the sample.…

The halo occupation distribution (HOD) describes the bias between galaxies and dark matter by specifying (a) the probability P(N|M) that a halo of virial mass M contains N galaxies of a particular class and (b) the relative distributions of…

The next generation of galaxy surveys will provide more precise measurements of galaxy clustering than have previously been possible. The 21-cm radio signals that are emitted from neutral atomic hydrogen (HI) gas will be detected by…

Cosmology and Nongalactic Astrophysics · Physics 2022-10-12 Fei Qin , Cullan Howlett , Adam R. H. Stevens , David Parkinson

We present the first detailed analysis of the connection between galaxies and their dark matter halos for the unWISE galaxy catalog -- a full-sky, infrared-selected sample built from WISE data, containing over 500 million galaxies. Using…

Cosmology and Nongalactic Astrophysics · Physics 2023-01-24 Aleksandra Kusiak , Boris Bolliet , Alex Krolewski , J. Colin Hill

The halo occupation distribution (HOD) describes the relation between galaxies and dark matter at the level of individual dark matter halos. The properties of galaxies residing at the centers of halos differ from those of satellite galaxies…

We perform an analysis of the spatial clustering properties of HI selected galaxies from the HI Parkes All Sky Survey (HIPASS) using the formalism of the halo occupation distribution (HOD). The resulting parameter constraints show that the…

Cosmology and Nongalactic Astrophysics · Physics 2009-08-21 Stuart Wyithe , Michael J. I. Brown , Martin A. Zwaan , Martin J. Meyer

Obscuration in quasars may arise from steep viewing angles along the dusty torus, or instead may represent a distinct phase of supermassive black hole growth. We test these scenarios by probing the host dark matter halo environments of…

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

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…

We model the luminosity-dependent projected and redshift-space two-point correlation functions (2PCFs) of the Sloan Digital Sky Survey (SDSS) DR7 Main galaxy sample, using the halo occupation distribution (HOD) model and the subhalo…

We perform Halo Occupation Distribution (HOD) modeling to interpret small-scale and intermediate-scale clustering of 35,000 luminous early-type galaxies and their cross-correlation with a reference imaging sample of normal L* galaxies in…

Astrophysics · Physics 2014-11-18 Zheng Zheng , Idit Zehavi , Daniel J. Eisenstein , David H. Weinberg , Y. P. Jing

This is the second paper of a series that reports on our investigation of the clustering properties of AGNs in the ROSAT All-Sky Survey (RASS) through cross-correlation functions (CCFs) with Sloan Digital Sky Survey (SDSS) galaxies. In this…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-20 Takamitsu Miyaji , Mirko Krumpe , Alison L. Coil , Hector Aceves

Recent work on quasar clustering suggests a degeneracy in the halo occupation distribution constrained from two-point correlation functions. To break this degeneracy, we make the first empirical measurement of the mean occupation function…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-17 Suchetana Chatterjee , My Nguyen , Adam Myers , Zheng Zheng

We investigate galaxy bias in the framework of the ``Halo Occupation Distribution'' (HOD), which defines the bias of a population of galaxies by the conditional probability P(N|M) that a dark matter halo of virial mass M contains N…

Astrophysics · Physics 2009-11-07 Andreas A. Berlind , David H. Weinberg
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