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An analytical model is developed for the mass function of cold dark matter subhalos at the time of accretion and for the distribution of their accretion times. Our model is based on the model of Zhao et al. (2009) for the median assembly…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-27 Xiaohu Yang , H. J. Mo , Youcai Zhang , Frank C. van den Bosch

We present astrophysical applications of the recently popular halo model to describe large scale structure clustering. We formulate the power spectrum, bispectrum and trispectrum of dark matter density field in terms of correlations within…

Astrophysics · Physics 2007-05-23 Asantha Cooray

We carry out a detailed numerical investigation of the spatial correlation function of the initial positions of cosmological dark matter halos. In this Lagrangian coordinate system, which is especially useful for analytic studies of…

Astrophysics · Physics 2009-11-10 Evan Scannapieco , Robert J. Thacker

In our modern understanding of galaxy formation, every galaxy forms within a dark matter halo. The formation and growth of galaxies over time is connected to the growth of the halos in which they form. The advent of large galaxy surveys as…

Astrophysics of Galaxies · Physics 2018-10-17 Risa H. Wechsler , Jeremy L. Tinker

In a previous paper, we described a new method for including detailed information about substructure in semi-analytic models of dark matter halo formation based on merger trees. In this paper, we present the basic predictions of our full…

Astrophysics · Physics 2009-11-10 James E. Taylor , Arif Babul

We have made a detailed comparison of the results of large N-body simulations with the analytical description of the merging histories of dark matter halos presented in Lacey & Cole 1993, which is based on an extension of the Press-…

Astrophysics · Physics 2015-06-24 Cedric Lacey , Shaun Cole

The most commonly used definition of halo formation is the time when a halo's most massive progenitor first contains at least half the final mass of its parent. Reasonably accurate formulae for the distribution of formation times of haloes…

Astrophysics · Physics 2009-11-10 Ravi K. Sheth , Giuseppe Tormen

This paper reviews the constraints that can be placed on the shapes of disk galaxies' dark halos using the distribution and kinematics of atomic hydrogen. These data indicate that dark halos are close to axisymmetric, with their axes of…

Astrophysics · Physics 2017-08-23 M. R. Merrifield

We use a new method, the cross power spectrum between the linear density field and the halo number density field, to measure the Lagrangian bias for dark matter halos. The method has several important advantages over the conventional…

Astrophysics · Physics 2009-10-31 Y. P. Jing

We explore the relation between the structure and mass accretion histories of dark matter halos using a suite of cosmological simulations. We confirm that the formation time, defined as the time when the virial mass of the main progenitor…

Cosmology and Nongalactic Astrophysics · Physics 2015-08-04 Camila A. Correa , J. Stuart B. Wyithe , Joop Schaye , Alan R. Duffy

I use $N$-body simulations to investigate the morphology and the dynamical evolution and properties of dark matter halos in clusters of galaxies. My sample consists of nine massive halos, coming from an Einstein-de Sitter universe with…

Astrophysics · Physics 2007-05-23 Giuseppe Tormen

In hierarchical models, the time derivative of the halo mass function may be thought of as the difference of two terms - a creation term, which describes the increase in the number of haloes of mass m from mergers of less massive objects,…

Astrophysics · Physics 2009-07-10 Jorge Moreno , Carlo Giocoli , Ravi K. Sheth

We develop a new formalism for modeling the formation and evolution of galaxies within a hierarchical universe. Similarly to standard semi-analytical models we trace galaxies inside dark-matter merger-trees. The formalism includes treatment…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-14 Eyal Neistein , Simone M. Weinmann

Based on the star formation histories (SFH) of galaxies in halos of different masses, we develop an empirical model to grow galaxies in dark mattet halos. This model has very few ingredients, any of which can be associated to observational…

Astrophysics of Galaxies · Physics 2016-08-17 Shijie Li , Youcai Zhang , Xiaohu Yang , Huiyuan Wang , Dylan Tweed , Chengze Liu , Lei Yang , Feng Shi , Yi Lu , Wentao Luo , Jianwen Wei

The excursion set theory based on spherical or ellipsoidal gravitational collapse provides an elegant analytic framework for calculating the mass function and the large-scale bias of dark matter haloes. This theory assumes that the…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 Chung-Pei Ma , Michele Maggiore , Antonio Riotto , Jun Zhang

We present a comparison of the observed evolving galaxy stellar mass functions with the predictions of eight semi-analytic models and one halo occupation distribution model. While most models are able to fit the data at low redshift, some…

Wave dark matter ($\psi$DM), which satisfies the Schr\"odinger-Poisson equation, has recently attracted substantial attention as a possible dark matter candidate. Numerical simulations have in the past provided a powerful tool to explore…

Cosmology and Nongalactic Astrophysics · Physics 2018-06-12 Shan-Chang Lin , Hsi-Yu Schive , Shing-Kwong Wong , Tzihong Chiueh

(Shortened) We use N-body simulations to investigate the structure and dynamical evolution of dark matter halos in galaxy clusters. Our sample consists of nine massive halos from an EdS universe with scale free power spectrum and n = -1.…

Astrophysics · Physics 2015-06-24 Giuseppe Tormen , Francois R. Bouchet , Simon D. M. White

The halo assembly bias, a phenomenon referring to dependencies of the large-scale bias of a dark matter halo other than its mass, is a fundamental property of the standard cosmological model. First discovered in 2005 from the Millennium Run…

Cosmology and Nongalactic Astrophysics · Physics 2022-10-19 Yen-Ting Lin , Hironao Miyatake , Hong Guo , Yi-Kuan Chiang , Kai-Feng Chen , Ting-Wen Lan , Yu-Yen Chang

Using six high resolution dissipationless simulations with a varying box size in a flat LCDM universe, we study the mass and redshift dependence of dark matter halo shapes for M_vir = 9.0e11 - 2.0e14, over the redshift range z=0-3, and for…