Computational Eulerian Hydrodynamics and Galilean Invariance (2009)
Robertson, Brant E., Kravtsov, Andrey V., Gnedin, Nickolay Y., Abel, Tom, Rudd, Douglas H.
Eulerian hydrodynamical simulations are a powerful and popular tool for modeling fluids in astrophysical systems. In this work, we critically examine recent claims that these methods violate Galilean...
Effects of Baryon Dissipation on the Dark Matter Virial Scaling Relation (2009)
Lau, Erwin T., Nagai, Daisuke, Kravtsov, Andrey V.
We investigate effects of baryon dissipation on the dark matter virial scaling relation between total mass and velocity dispersion and the velocity bias of galaxies in groups and clusters using...
Dark matter substructure and dwarf galactic satellites (2009)
A decade ago cosmological simulations of increasingly higher resolution were used to demonstrate that virialized regions of Cold Dark Matter (CDM) halos are filled with a multitude of dense,...
Cosmological Radiative Transfer Comparison Project II: The Radiation-Hydrodynamic Tests (2009)
Iliev, Ilian T., Whalen, Daniel, Mellema, Garrelt, Ahn, Kyungjin, Baek, Sunghye, Gnedin, Nickolay Y., ...
The development of radiation hydrodynamical methods that are able to follow gas dynamics and radiative transfer self-consistently is key to the solution of many problems in numerical astrophysics....
Lau, Erwin T., Kravtsov, Andrey V., Nagai, Daisuke
We present analysis of bulk and random gas motions in the intracluster medium using high-resolution Eulerian cosmological simulations of sixteen simulated clusters, including both very relaxed and...
Kazantzidis, Stelios, Zentner, Andrew R., Kravtsov, Andrey V., Bullock, James S., Debattista, V. P.
(Abridged) We perform dissipationless N-body simulations to elucidate the dynamical response of thin disks to bombardment by cold dark matter (CDM) substructure. Our method combines (1) cosmological...
Evolution of Dark Matter Phase-Space Density Distributions in Equal-Mass Halo Mergers (2008)
Vass, Ileana M., Kazantzidis, Stelios, Valluri, Monica, Kravtsov, Andrey V.
We use dissipationless N-body simulations to investigate the evolution of the true coarse-grained phase-space density distribution f(x,v) in equal-mass mergers between dark matter (DM) halos. The...
Modeling Molecular Hydrogen and Star Formation in Cosmological Simulations (2008)
Gnedin, Nickolay Y., Tassis, Konstantinos, Kravtsov, Andrey V.
We describe a phenomenological model for molecular hydrogen formation suited for applications in galaxy formation simulations, which includes on-equilibrium formation of molecular hydrogen on dust...
Toward a halo mass function for precision cosmology: the limits of universality (2008)
Tinker, Jeremy L, Kravtsov, Andrey V, Klypin, Anatoly, Abazajian, Kevork, Warren, Michael S, Yepes, Gustavo, ...
We measure the mass function of dark matter halos in a large set of collisionless cosmological simulations of flat LCDM cosmology and investigate its evolution at z
Quantifying the Evolution of Higher--Order Clustering (2007)
Jens Schmalzing Stefan, Stefan Gottlober, Andrey V. Kravtsov
We use a high--resolution dissipationless simulation to study the evolution of the dark matter and halo distributions in a spatially flat cosmological model dominated by a cosmological constant and...
Galaxies In N-Body Simulations: Overcoming The Overmerging Problem (2007)
Anatoly A. Klypin, Stefan Gottl Ober, Andrey V. Kravtsov, Alexei M. Khokhlov
We present analysis of the evolution of dark matter halos in dense environments of groups and clusters in dissipationless cosmological simulations. The premature destruction of halos in such...
Levine, Robyn, Gnedin, Nickolay Y., Hamilton, Andrew J. S., Kravtsov, Andrey V.
Using a hydrodynamic adaptive mesh refinement code, we simulate the growth and evolution of a galaxy, which could potentially host a supermassive black hole, within a cosmological volume. Reaching a...
Effects of galaxy formation on thermodynamics of the intracluster medium (2007)
Nagai, Daisuke, Kravtsov, Andrey V., Vikhlinin, Alexey
We present detailed comparisons of the intracluster medium (ICM) in cosmological Eulerian cluster simulations with deep Chandra observations of nearby relaxed clusters. To assess the impact of galaxy...
Kazantzidis, Stelios, Bullock, James S., Zentner, Andrew R., Kravtsov, Andrey V., Moustakas, Leonidas A.
(Abridged) We conduct a series of high-resolution, dissipationless N-body simulations to investigate the cumulative effect of substructure mergers onto thin disk galaxies in the context of the LCDM...
Escape of Ionizing Radiation from High Redshift Galaxies (2007)
Gnedin, Nickolay Y., Kravtsov, Andrey V., Chen, Hsiao-Wen
We model the escape of ionizing radiation from high-redshift galaxies using high-resolution Adaptive Mesh Refinement N-body + hydrodynamics simulations. Our simulations include time-dependent and...
Effects of Baryons and Dissipation on the Matter Power Spectrum (2007)
Rudd, Douglas H., Zentner, Andrew R., Kravtsov, Andrey V.
We study the importance of baryonic physics on predictions of the matter power spectrum as it is relevant for forthcoming weak lensing surveys. We quantify the impact of baryonic physics using a set...
Effects of Galaxy Formation on Thermodynamics of the Intracluster Medium (2007)
Nagai, Daisuke, Kravtsov, Andrey V., Vikhlinin, Alexey
We present detailed comparisons of the intracluster medium (ICM) in cosmological Eulerian cluster simulations with deep Chandra observations of nearby relaxed clusters. To assess the impact of galaxy...
The Hierarchical Build-Up of Massive Galaxies and the Intracluster Light since z=1 (2007)
Conroy, Charlie, Wechsler, Risa H., Kravtsov, Andrey V.
We use a set of simulation-based models for the dissipationless evolution of galaxies since z=1 to constrain the fate of accreted satellites embedded in dark matter subhalos. These models assign...
Modeling Chandra X-ray observations of Galaxy Clusters using Cosmological Simulations (2006)
Nagai, Daisuke, Kravtsov, Andrey V., Vikhlinin, Alexey
X-ray observations of galaxy clusters potentially provide powerful cosmological probes if systematics due to our incomplete knowledge of the intracluster medium (ICM) physics are understood and...
Scaling Relations of Dwarf Galaxies without Supernova-Driven Winds (2006)
Tassis, Konstantinos, Kravtsov, Andrey V., Gnedin, Nickolay Y.
Nearby dwarf galaxies exhibit tight correlations between their global stellar and dynamical properties, such as circular velocity, mass-to-light ratio, stellar mass, surface brightness, and...
On relaxation processes in collisionless mergers (2006)
Valluri, Monica, Vass, Ileana M., Kazantzidis, Stelios, Kravtsov, Andrey V., Bohn, Courtlandt L.
We analyze N-body simulations of halo mergers to investigate the mechanisms responsible for driving mixing in phase-space and the evolution to dynamical equilibrium. We focus on mixing in energy and...
Testing X-ray Measurements of Galaxy Clusters with Cosmological Simulations (2006)
Nagai, Daisuke, Vikhlinin, Alexey, Kravtsov, Andrey V.
X-ray observations of galaxy clusters potentially provide powerful cosmological probes if systematics due to our incomplete knowledge of the intracluster medium (ICM) physics are understood and...
"The Perfect Slope": A new robust low-scatter X-ray mass indicator for clusters of galaxies (2006)
Vikhlinin, Alexey, Kravtsov, Andrey V., Nagai, Daisuke
This presentation is a Moriond version of our recent paper (Kravtsov, Vikhlinin & Nagai astro-ph/0603205) where we discussed X-ray proxies for the total cluster mass, including the spectral...
Galactic Halo Formation and the Evolution of Bias (2006)
Pedro Colín, Anatoly A. Klypin, Andrey V. Kravtsov, Alexei M. Khokhlov
Galactic Halo Formation and the Evolution of Bias
Modeling Galaxy Clustering with Cosmological Simulations (2006)
I review recent progress in understanding and modeling galaxy clustering in cosmological simulations, with emphasis on models based on high-resolution dissipationless simulations. During the last...
A Large Dark Matter Core in the Fornax Dwarf Spheroidal Galaxy? (2006)
Strigari, Louis E., Bullock, James S., Kaplinghat, Manoj, Kravtsov, Andrey V., Gnedin, Oleg Y., Abazajian, Kevork, ...
We use measurements of the stellar velocity dispersion profile of the Fornax dwarf spheroidal galaxy to derive constraints on its dark matter distribution. Though the data are unable to distinguish...
A New Robust Low-Scatter X-ray Mass Indicator for Clusters of Galaxies (2006)
Kravtsov, Andrey V., Vikhlinin, Alexey, Nagai, Daisuke
We present comparison of X-ray proxies for the total cluster mass, including the spectral temperature (Tx), gas mass measured within r500 (Mg), and the new proxy, Yx, which is a simple product of Tx...
Fossils of Reionization in the Local Group (2006)
Gnedin, Nickolay Y., Kravtsov, Andrey V.
We use a combination of high-resolution gasdynamics simulations of high-redshift dwarf galaxies and dissipationless simulations of a Milky Way sized halo to estimate the expected abundance and...
The Dependence of Halo Clustering on Halo Formation History, Concentration, and Occupation (2005)
Wechsler, Risa H., Zentner, Andrew R., Bullock, James S., Kravtsov, Andrey V., Allgood, Brandon
We investigate the dependence of dark matter halo clustering on halo formation time, density profile concentration, and subhalo occupation number, using high-resolution numerical simulations of a...
Chen, Jacqueline, Kravtsov, Andrey V., Prada, Francisco, Sheldon, Erin S., Klypin, Anatoly A., Blanton, Michael R., ...
We use the Sloan Digital Sky Survey (SDSS) spectroscopic sample to constrain the projected radial distribution of satellites around isolated ~ L* galaxies. We employ mock galaxy catalogs derived from...
Modeling Luminosity-Dependent Galaxy Clustering Through Cosmic Time (2005)
Conroy, Charlie, Wechsler, Risa H., Kravtsov, Andrey V.
We employ high-resolution dissipationless simulations of the concordance LCDM cosmology to model the observed luminosity dependence and evolution of galaxy clustering through most of the age of the...
The Robustness of Dark Matter Density Profiles in Dissipationless Mergers (2005)
Kazantzidis, Stelios, Zentner, Andrew R., Kravtsov, Andrey V.
We present a comprehensive series of dissipationless N-body simulations to investigate the evolution of density distribution in equal-mass mergers between dark matter (DM) halos and multicomponent...
Dark Energy Studies: Challenges to Computational Cosmology (2005)
Annis, James, Castander, Francisco J., Evrard, August E., Frieman, Joshua A., Gaztanaga, Enrique, Jain, Bhuvnesh, ...
The ability to test the nature of dark mass-energy components in the universe through large-scale structure studies hinges on accurate predictions of sky survey expectations within a given world...
Constraining Dark Energy with the Dark Energy Survey: Theoretical Challenges (2005)
Annis, James, Bridle, Sarah, Castander, Francisco J., Evrard, August E., Fosalba, Pablo, Frieman, Joshua A., ...
The Dark Energy Survey (DES) will use a new imaging camera on the Blanco 4-m telescope at CTIO to image 5000 square degrees of sky in the South Galactic Cap in four optical bands, and to carry out...
The Shape of Dark Matter Halos: Dependence on Mass, Redshift, Radius, and Formation (2005)
Allgood, Brandon, Flores, Ricardo A., Primack, Joel R., Kravtsov, Andrey V., Wechsler, Risa H., Faltenbacher, Andreas, ...
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 -...
Flores, Ricardo A., Allgood, Brandon, Kravtsov, Andrey V., Primack, Joel R., Buote, David A., Bullock, James S.
(Abridged) We study predictions for galaxy cluster observables that can test the statistics of dark matter halo shapes expected in a flat LCDM universe. We present a simple analytical model for the...
Impact of Dark Matter Substructure on the Matter and Weak Lensing Power Spectra (2005)
Hagan, Bradley, Ma, Chung-Pei, Kravtsov, Andrey V.
We explore the effect of substructure in dark matter halos on the power spectrum and bispectrum of matter fluctuations and weak lensing shear. By experimenting with substructure in a cosmological N =...
The Anisotropic Distribution of Galactic Satellites (2005)
Zentner, Andrew R., Kravtsov, Andrey V., Gnedin, Oleg Y., Klypin, Anatoly A.
We present a study of the spatial distribution of subhalos in galactic dark matter halos using dissipationless cosmological simulations of the concordance LCDM model. We find that subhalos are...
Effects of cooling and star formation on the baryon fractions in clusters (2005)
Kravtsov, Andrey V., Nagai, Daisuke, Vikhlinin, Alexey A.
We study the effects of dissipation on the baryon fractions in clusters using high-resolution cosmological simulations of nine clusters that resolve formation of cluster galaxies. The simulations of...
The Physics of Galaxy Clustering I: A Model for Subhalo Populations (2004)
Zentner, Andrew R., Berlind, Andreas A., Bullock, James S., Kravtsov, Andrey V., Wechsler, Risa H.
(Abridged) We present a semi-analytic model for Cold Dark Matter halo substructure that can be used as a framework for studying galaxy formation and an ingredient in halo models of galaxy clustering....
Galaxy-galaxy Lensing: Dissipationless Simulations Versus the Halo Model (2004)
Mandelbaum, Rachel, Tasitsiomi, Argyro, Seljak, Uros, Kravtsov, Andrey V., Wechsler, Risa H.
Galaxy-galaxy lensing is a powerful probe of the relation between galaxies and dark matter halos, but its theoretical interpretation requires a careful modeling of various contributions, such as the...
Supersonic Motions of Galaxies in Clusters (2004)
Faltenbacher, Andreas, Kravtsov, Andrey V., Nagai, Daisuke, Gottloeber, Stefan
We study motions of galaxies in galaxy clusters formed in the concordance LCDM cosmology. We use high-resolution cosmological simulations that follow dynamics of dark matter and gas and include...
The Radial Distribution of Galaxies in LCDM clusters (2004)
Nagai, Daisuke, Kravtsov, Andrey V.
We study the radial distribution of subhalos and galaxies using high-resolution cosmological simulations of galaxy clusters formed in the concordance LCDM cosmology. In agreement with previous...
Gnedin, Oleg Y., Kravtsov, Andrey V., Klypin, Anatoly A., Nagai, Daisuke
The cooling of gas in the centers of dark matter halos is expected to lead to a more concentrated dark matter distribution. The response of dark matter to the condensation of baryons is usually...
The Effect of Gas Cooling on the Shapes of Dark Matter Halos (2004)
Kazantzidis, Stelios, Kravtsov, Andrey V., Zentner, Andrew R., Allgood, Brandon, Nagai, Daisuke, Moore, Ben
We analyze the effect of dissipation on the shapes of dark matter (DM) halos using high-resolution cosmological gasdynamics simulations of clusters and galaxies in the LCDM cosmology. We find that...
Simulating the Formation of Galaxy Clusters (2004)
Nagai, Daisuke, Kravtsov, Andrey V.
We study the effects of radiative cooling, star formation and stellar feedback on the properties and evolution of galaxy clusters using high-resolution Adaptive Mesh Refinement N-body+gasdynamics...
Modeling Galaxy-Mass Correlations in Dissipationless Simulations (2004)
Tasitsiomi, Argyro, Kravtsov, Andrey V., Wechsler, Risa H., Primack, Joel R.
We use high-resolution dissipationless simulations of the concordance flat LCDM model to make predictions for the galaxy--mass (GM) correlations and compare them to the recent SDSS weak lensing...
The tumultuous lives of galactic dwarfs and the missing satellites problem (2004)
Kravtsov, Andrey V., Gnedin, Oleg Y., Klypin, Anatoly A.
Hierarchical Cold Dark Matter (CDM) models predict that Milky Way (MW) sized halos contain hundreds of dense low-mass dark satellites, an order of magnitude more than the number of observed...
Density profiles of LCDM clusters (2003)
Tasitsiomi, Argyro, Kravtsov, Andrey V., Gottloeber, Stefan, Klypin, Anatoly A.
We analyze the mass accretion histories (MAHs) and density profiles of cluster- size halos with virial masses of 0.6-2.5x10^14/h Msun in a flat LCDM cosmology. In agreement with previous studies,we...
The Dark Side of the Halo Occupation Distribution (2003)
Kravtsov, Andrey V., Berlind, Andreas A., Wechsler, Risa H., Klypin, Anatoly A., Gottloeber, Stefan, Allgood, Brandon, ...
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...
Formation of globular clusters in hierarchical cosmology (2003)
Kravtsov, Andrey V., Gnedin, Oleg Y.
We study the formation of globular clusters (GCs) in a Milky Way-size galaxy using a high-resolution cosmological simulation. The clusters in our model form in the dense cores of supergiant molecular...
On the Origin of the Global Schmidt Law of Star Formation (2003)
One of the most puzzling properties of observed galaxies is the universality of the empirical correlation between the star formation rate and average gas surface density on kiloparsec scales (the...
Lensing Optical Depth for Substructure and Isolated Dark Matter Halos (2003)
Chen, Jacqueline, Kravtsov, Andrey V., Keeton, Charles R.
Multiply-imaged quasar lenses can be used to constrain the substructure mass fraction in galaxy-sized dark matter halos via anomalous flux ratios in lensed images. The flux ratios, however, can be...
Effect of Internal Flows on Sunyaev-Zeldovich Measurements of Cluster Peculiar Velocities (2002)
Nagai, Daisuke, Kravtsov, Andrey V., Kosowsky, Arthur
Galaxy clusters are potentially powerful probes of the large-scale velocity field in the Universe because their peculiar velocity can be estimated directly via the kinematic Sunyaev-Zeldovich effect...
Cold Fronts in CDM clusters (2002)
Nagai, Daisuke, Kravtsov, Andrey V.
Recently, high-resolution Chandra observations revealed the existence of very sharp features in the X-ray surface brightness and temperature maps of several clusters (Vikhlinin et. al., 2001). These...
Sample Variance Considerations for Cluster Surveys (2002)
Hu, Wayne, Kravtsov, Andrey V.
We present a general statistical framework for describing the effect of sample variance in the number counts of virialized objects and examine its effect on cosmological parameter estimation....
Spatial distribution of galactic halos and their merger histories (2002)
Gottloeber, Stefan, Kerscher, Martin, Kravtsov, Andrey V., Faltenbacher, Andreas, Klypin, Anatoly, Mueller, Volker
We use a novel statistical tool, the mark correlation functions (MCFs), to study clustering of galaxy-size halos as a function of their properties and environment in a high-resolution numerical...
Concentrations and Assembly Histories of Dark Matter Halos (2001)
Wechsler, Risa H., Bullock, James S., Primack, J. R., Kravtsov, Andrey V., Dekel, Avishai
We study the relation between the density profiles of dark matter halos and their mass assembly histories, using a statistical sample of halos in a high-resolution N-body simulation of the LCDM...
Angular Momentum Profiles of Warm Dark Matter Halos (2001)
Bullock, James S., Kravtsov, Andrey V., Colin, Pedro
We compare the specific angular momentum profiles of virialized dark halos in cold dark matter (CDM) and warm dark matter (WDM) models using high-resolution dissipationless simulations. The...
Kravtsov, Andrey V., Klypin, Anatoly A., Hoffman, Yehuda
We present results of gasdynamics+N-body constrained cosmological simulations of the Local Supercluster region (LSC; about 30/h Mpc around the Virgo cluster), which closely mimic the real Universe...
Concentrations of Dark Halos from their Assembly Histories (2001)
Wechsler, Risa H., Bullock, James S., Primack, Joel R., Kravtsov, Andrey V., Dekel, Avishai
(abridged) We study the relation between the density profiles of dark matter halos and their mass assembly histories, using a statistical sample of halos in a high-resolution N-body simulation of the...
Galactic Halo Formation and the Evolution of Bias (2001)
Colín , Pedro, Khokhlov , Alexei M., Klypin , Anatoly A., Kravtsov , Andrey V.
We study the evolution of bias in four cosmological models (LambdaCDM, OCDM, tauCDM, and SCDM). The use of very high-resolution simulations, achieved with the AP3M code, produces dozens of...
A universal angular momentum profile for galactic halos (2000)
Bullock, James S., Dekel, Avishai, Kolatt, Tsafrir S., Kravtsov, Andrey V., Klypin, Anatoly A., Porciani, Cristiano, ...
[Abridged] We study the angular-momentum profiles of a statistical sample of halos drawn from a high-resolution N-body simulation of the LCDM cosmology. We find that the cumulative mass distribution...
Interaction rates of dark-matter halos and subhalos (2000)
Kolatt, Tsafrir S., Bullock, James S., Sigad, Yair, Kravtsov, Andrey V., Klypin, Anatoly A., Primack, Joel R., ...
[Abridged] The interaction rates of dark-matter halos and subhalos, are computed using high-resolution cosmological N-body simulations of the Lambda-CDM model. Although the number fraction of...
Origin and Destiny of Dark Matter Halos: Cosmological Matter Exchange and Metal Enrichment (2000)
Kolatt, Tsafrir S., Bullock, James S., Dekel, Avishai, Primack, Joel R., Sigad, Yair, Kravtsov, Andrey V., ...
[Abridged] We analyze the exchange of dark matter between halos, subhalos, and their environments in a high-resolution cosmological N-body simulation of a Lambda CDM cosmology. At each analyzed...
Hierarchical galaxy formation and substructure in the Galaxy's stellar halo (2000)
Bullock, James S., Kravtsov, Andrey V., Weinberg, David H.
We develop an explicit model for the formation of the stellar halo from tidally disrupted, accreted dwarf satellites in the cold dark matter (CDM) framework, focusing on predictions testable with the...
Resolving the Structure of Cold Dark Matter Halos II (2000)
Klypin, Anatoly, Kravtsov, Andrey V., Bullock, James, Primack, Joel
We study the effects of mass and force resolution on the density profiles of galaxy-size Cold Dark Matter (CDM) halos in a flat, low-density cosmological model with vacuum energy. We show...
Velocity and Mass Functions of Galactic Halos: Evolution and Environmental Dependence (2000)
Sigad, Yair, Kolatt, Tsafrir S., Bullock, James S., Kravtsov, Andrey V., Klypin, Anatoly A., Primack, Joel R., ...
We study the distribution functions of mass and circular velocity for dark matter halos in N-body simulations of the $\Lambda$CDM cosmology, addressing redshift and environmental dependence. The...
On the supernovae heating of intergalactic medium (2000)
Kravtsov, Andrey V., Yepes, Gustavo
We present estimates of the energy input from supernovae (SNe) into the intergalactic medium using (i) recent measurements of Si and Fe abundances in the intracluster medium (ICM) and (ii)...
Reionization and the abundance of galactic satellites (2000)
Bullock, James S., Kravtsov, Andrey V., Weinberg, David H.
One of the main challenges facing standard hierarchical structure formation models is that the predicted abundance of galactic subhalos with circular velocities of 10-30 km/s is an order of magnitude...
On effects of resolution in dissipationless cosmological simulations (1999)
Knebe, Alexander, Kravtsov, Andrey V., Gottloeber, Stefan, Klypin, Anatoly
We present a study of numerical effects in dissipationless cosmological simulations. The numerical effects are evaluated and studied by comparing results of a series of 64^3-particle simulations of...
Spatial and Velocity Biases (1999)
Klypin, Anatoly, Kravtsov, Andrey V., Colin, Pedro
We give a summary of our recent studies of spatial and velocity biases of galaxy-size halos in cosmological models. Recent progress in numerical techniques made it possible to simulate halos in large...
Merging Rate of Dark Matter Halos: Evolution and Dependence on Environment (1999)
Gottloeber, Stefan, Klypin, Anatoly, Kravtsov, Andrey V.
We discuss the impact of the cosmological environment on the evolution of dark matter halos using a high-resolution simulation within a spatially flat LCDM cosmology.
Profiles of dark haloes: evolution, scatter, and environment (1999)
Bullock, James S., Kolatt, Tsafrir S., Sigad, Yair, Somerville, Rachel S., Kravtsov, Andrey V., Klypin, Anatoly A., ...
We study dark-matter halo density profiles in a high-resolution N-body simulation of an LCDM cosmology. Our statistical sample contains ~5000 haloes in the range 10^{11}-10^{14} M_sun. The profiles...
Velocity bias in a LCDM model (1999)
Colin, Pedro, Klypin, Anatoly, Kravtsov, Andrey V.
We use N-body simulations to study the velocity bias of dark matter halos, the difference in the velocity fields of dark matter and halos, in a flat low- density LCDM model. The high force, 2kpc/h,...
Quantifying the evolution of higher-order clustering (1999)
Schmalzing, Jens, Gottloeber, Stefan, Klypin, Anatoly A., Kravtsov, Andrey V.
We use a high-resolution dissipationless simulation to study the evolution of the dark matter and halo distributions in a spatially flat cosmological model dominated by a cosmological constant...
Young galaxies: what turns them on? (1999)
Kolatt, Tsafrir S., Bullock, James S., Somerville, Rachel S., Sigad, Yair, Jonsson, Patrik, Kravtsov, Andrey V., ...
Lyman break galaxies (LBGs) at $z \sim 3$ exhibit number densities and clustering similar to local $L_*$ galaxies; however, their star formation rates (SFRs) are much higher. We explore the scenario...
Where are the missing galactic satellites? (1999)
Klypin, Anatoly A., Kravtsov, Andrey V., Valenzuela, Octavio, Prada, Francisco
Using published data, we have compiled the circular velocity (Vc) distribution function (VDF) of galaxy satellites in the Local Group. We find that within the volumes of radius of 570 kpc (400/h kpc...
The Cores of Dark Matter Dominated Galaxies: theory vs. observations (1997)
Kravtsov, Andrey V., Klypin, Anatoly A., Bullock, James S., Primack, Joel R.
We use the rotation curves of a sample of dark matter dominated dwarf and low-surface brightness (LSB) late-type galaxies to study their radial mass distributions. We find that the shape of the...
Adaptive Refinement Tree - A New High-Resolution N-Body Code for Cosmological Simulations, (1997)
Kravtsov, Andrey V., Klypin, Anatoly A., Khokhlovq, Alexei M.
We present a new high-resolution N-body algorithm for cosmological simulations. The algorithm employs a traditional particle-mesh technique on a cubic grid and successive multilevel relaxations on...
Adaptive Refinement Tree - a new high-resolution N-body code for cosmological simulations (1997)
Kravtsov, Andrey V., Klypin, Anatoly A., Khokhlov, Alexei M.
We present a new high-resolution N-body algorithm for cosmological simulations. The algorithm employs a traditional particle-mesh technique on a cubic grid and successive multilevel relaxations on...
Large-scale distribution of quasars in deep pencil-beam surveys (1996)
We have used integral two-point spatial correlation function and its second derivative to analyze the distribution of quasars in three very deep surveys published in the literature. Statistically...
The search and investigation of the Large Groups of Quasars (1996)
Komberg, Boris V., Kravtsov, Andrey V., Lukash, Vladimir N.
Recently, it was suggested that large concentrations or groups of quasars may trace sites of enhanced matter density at medium and high redshifts analogous to how galaxy clusters trace them in nearby...