High-Redshift Clumpy Disks and Bulges in Cosmological Simulations (2009)
Ceverino, Daniel, Dekel, Avishai, Bournaud, Frederic
We analyze the first cosmological simulations that recover the fragmentation of high-redshift galactic discs driven by cold streams. The fragmentation is recovered owing to an AMR resolution better...
Morphological quenching of star formation: making early-type galaxies red (2009)
Martig, Marie, Bournaud, Frederic, Teyssier, Romain, Dekel, Avishai
We point out a natural mechanism for quenching of star formation in early-type galaxies. It automatically links the color of a galaxy with its morphology and does not require gas consumption, removal...
Universal Merging Histories of Dark-Matter Haloes (2009)
Neistein, Eyal, Maccio, Andrea V., Dekel, Avishai
We study merger histories of dark-matter haloes within various cosmological models by running a set of N-body simulations. The simulated cases include WMAP5 results, as well as EdS universe, with...
Dekel, Avishai, Sari, Re'em, Ceverino, Daniel
We present a simple theoretical framework for massive galaxies at high redshift, where most of the assembly and star formation occurred. The evolution is governed by the interplay between fueling by...
Scaling Relations and the Fundamental Line of the Local Group Dwarf Galaxies (2008)
Woo, Joanna, Courteau, Stephane, Dekel, Avishai
We study the scaling relations between global properties of dwarf galaxies in the Local Group. In addition to quantifying the correlations between pairs of variables, we explore the "shape" of the...
The Tidal Origin of the Environment Dependence of Halo Assembly (2008)
Hahn, Oliver, Porciani, Cristiano, Dekel, Avishai, Carollo, C. Marcella
We uncover the origin of the puzzling anti-correlation between the formation epoch of galactic dark-matter haloes and their environment density. This correlation has been revealed from cosmological...
Merger Rates of Dark-Matter Haloes (2008)
Neistein, Eyal, Dekel, Avishai
We derive analytic merger rates for dark-matter haloes within the framework of the Extended Press-Schechter (EPS) formalism. These rates become self-consistent within EPS once we realize that the...
The effect of galaxy mass ratio on merger-driven starbursts (2008)
Cox, T. J., Jonsson, Patrik, Somerville, Rachel S., Primack, Joel R., Dekel, Avishai
We employ numerical simulations of galaxy mergers to explore the effect of galaxy mass ratio on merger-driven starbursts. Our numerical simulations include radiative cooling of gas, star formation,...
Scaling Relations of Spiral Galaxies (2007)
Courteau, Stéphane, Dutton, Aaron A., Van Den Bosch, Frank C., MacArthur, Lauren A., Dekel, Avishai, McIntosh, Daniel H., ...
We construct a large data set of global structural parameters for 1300 field and cluster spiral galaxies and explore the joint distribution of luminosity L, optical rotation velocity V, and disk size...
Large-Scale Power Spectrum and Cosmological Parameters from SFI Peculiar Velocities (2007)
Wolfram Freudling, Idit Zehavi, Avishai Dekel, Amiram Eldar, Riccardo Giovanelli, ...
We estimate the power spectrum of mass density fluctuations from peculiar velocities of galaxies by applying an improved maximum-likelihood technique to the new all-sky SFI catalog. Parametric models...
Wiener Reconstruction Of Large-Scale Structure From Peculiar Velocities (2007)
Saleem Zaroubi Yehuda, Yehuda Hoffman, Avishai Dekel
We present an alternative, Bayesian method for large-scale reconstruction from observed peculiar velocities. The method stresses a rigorous treatment of the random errors and it allows extrapolation...
Maximum-Likelihood Comparisons of Tully-Fisher and Redshift Data: Constraints (2007)
On Omega, Jeffrey A. Willick, Michael A. Strauss, Avishai Dekel, Tsafrir Kolatt, Alfred P. Sloan, ...
We compare Tully-Fisher (TF) data for 838 galaxies within cz = 3000 km s \Gamma1 from the Mark III catalog to the peculiar velocity and density fields predicted from the 1.2 Jy IRAS redshift survey....
The effect of galaxy mass ratio on merger--driven starbursts (2007)
Cox, T. J., Jonsson, Patrik, Somerville, Rachel S., Primack, Joel R., Dekel, Avishai
We employ numerical simulations of galaxy mergers to explore the effect of galaxy mass ratio on merger--driven starbursts. Our numerical simulations include radiative cooling of gas, star formation,...
Constructing Merger Trees that Mimic N-Body Simulations (2007)
Neistein, Eyal, Dekel, Avishai
We present a simple and efficient empirical algorithm for constructing dark-matter halo merger trees that reproduce the distribution of trees in the Millennium cosmological $N$-body simulation. The...
Gravitational Quenching in Massive Galaxies and Clusters by Clumpy Accretion (2007)
Dekel, Avishai, Birnboim, Yuval
We consider a simple gravitational-heating mechanism for the long-term quenching of cooling flows and star formation in massive dark-matter haloes hosting ellipticals and clusters. The virial shock...
The Evolution of Dark Matter Halo Properties in Clusters, Filaments, Sheets and Voids (2007)
Hahn, Oliver, Carollo, C. Marcella, Porciani, Cristiano, Dekel, Avishai
We use a series of N-body simulations of the LCDM cosmology to investigate the redshift evolution since z=1 of the properties and alignment with the large-scale structure of haloes in clusters,...
Bursting and Quenching in Massive Galaxies without Major Mergers or AGNs (2007)
Birnboim, Yuval, Dekel, Avishai, Neistein, Eyal
We simulate the buildup of galaxies by spherical gas accretion through dark matter haloes, subject to the development of virial shocks. We find that a uniform cosmological accretion turns into a...
A revised model for the formation of disk galaxies: low spin and dark halo expansion (2007)
Dutton, Aaron A., Van Den Bosch, Frank C., Dekel, Avishai, Courteau, Stéphane
We use observed rotation velocity-luminosity (VL) and size-luminosity (RL) relations to single out a specific scenario for disk galaxy formation in the LambdaCDM cosmology. Our model involves four...
Scaling relations of spiral galaxies (2007)
Courteau, Stéphane, Dutton, Aaron A., Van Den Bosch, Frank C., MacArthur, Lauren A., Dekel, Avishai, McIntosh, Daniel H., ...
We construct a large data set of global structural parameters for 1300 field and cluster spiral galaxies and explore the joint distribution of luminosity L, optical rotation velocity V, and disk size...
Properties of Dark Matter Haloes in Clusters, Filaments, Sheets and Voids (2006)
Hahn, Oliver, Porciani, Cristiano, Carollo, C. Marcella, Dekel, Avishai
Using a series of high-resolution N-body simulations of the concordance cosmology we investigate how the formation histories, shapes and angular momenta of dark-matter haloes depend on environment....
Natural Downsizing in Hierarchical Galaxy Formation (2006)
Neistein, Eyal, Dekel, Avishai
Stellar-population analyses of today's galaxies show "downsizing", where the stars in more massive galaxies tend to have formed earlier and over a shorter time span. We show that this phenomenon is...
A Revised Model for the Formation of Disk Galaxies: Low Spin and Dark-Halo Expansion (2006)
Dutton, Aaron A., Dekel, Avishai, Courteau, Stephane
We use observed rotation velocity-luminosity (VL) and size-luminosity (RL) relations to single out a specific scenario for disk galaxy formation in the LCDM cosmology. Our model involves four...
Shapes of Stellar Systems and Dark Halos from Simulations of Galaxy Major Mergers (2006)
Novak, Gregory S., Cox, Thomas J., Primack, Joel R., Jonsson, Patrik, Dekel, Avishai
Using a sample of 89 snapshots from 58 hydrodynamic binary galaxy major merger simulations, we find that stellar remnants are mostly oblate while dark matter halos are mostly prolate or triaxial. The...
The Dissipative Merger Progenitors of Elliptical Galaxies (2006)
We address the deviations of the scaling relations of elliptical galaxies from the expectations based on the virial theorem and homology, including the "tilt" of the "fundamental plane" and the steep...
Lost and found dark matter in elliptical galaxies (2006)
Stoehr, Felix, Mamon, Gary A., Dekel, Avishai, Cox, Thomas J.
The kinematical properties of elliptical galaxies formed during the mergers of equal mass, stars+gas+dark matter spiral galaxies are compared to the observed low velocity dispersions found for...
Natural downsizing in hierarchical galaxy formation (2006)
Neistein, Eyal, Van Den Bosch, Frank C., Dekel, Avishai
Stellar-population analyses of today's galaxies show `downsizing', where the stars in more massive galaxies tend to have formed earlier and over a shorter time-span. We show that this phenomenon is...
On the Correlations of Massive Black Holes with their Host Galaxies (2005)
Novak, Gregory S., Faber, S. M., Dekel, Avishai
We address the correlations of black hole (BH) mass with four different host-galaxy properties from eleven existing data sets. To guide theoretical understanding, we first try to quantify the...
Mamon, Gary A., Dekel, Avishai, Stoehr, Felix
While kinematical modelling of the low PN velocity dispersions observed in the outer regions of elliptical galaxies suggest a lack of dark matter around these galaxies, we report on an analysis of a...
Origin of the Joint Distribution of Structural Parameters in Disc Galaxies (2005)
Dutton, Aaron A., Courteau, Stephane, Dekel, Avishai
We use a simple model of disc-galaxy formation in the LCDM cosmology to simultaneously reproduce the slopes, zero-points, scatter and uncorrelated residuals in the observed velocity-luminosity (VL)...
Galaxy Bimodality due to Cold Flows and Shock Heating (2004)
Dekel, Avishai, Birnboim, Yuval
We address the origin of the robust bi-modality observed in galaxy properties about a characteristic stellar mass ~3x10^{10}Msun. Less massive galaxies tend to be ungrouped blue star-forming discs,...
Phase-Space Structure & Substructure of Dark Halos (2004)
A method is presented for computing the 6-D phase-space density f(x,v) and its PDF v(f) in an N-body system. It is based on Delaunay tessellation, yielding v(f) with a fixed smoothing window over a...
Characteristic Scales in Galaxy Formation (2004)
Recent data, e.g. from SDSS and 2dF, reveal a robust bi-modality in the distribution of galaxy properties, with a characteristic transition scale at stellar mass M_*~3x10^{10} Msun (near L_*),...
Scaling Relations of Local Spiral Galaxies.I. Observational Foundations (2003)
Courteau, Stephane, MacArthur, Lauren A., Dekel, Avishai, Bosch, Frank Van Den, McIntosh, Daniel H., Dale, Daniel
(Abridged) This paper presents an exploration of two fundamental scaling relations of spiral galaxies, the luminosity-rotation speed (or Tully-Fisher; TF) relation, and the size-luminosity (SL)...
Photo-evaporation by thermal winds in dwarf galaxies (2003)
Shaviv, Nir J., Dekel, Avishai
We revisit the evaporation process of gas from dwarf galaxies after it has been photo-ionized by the UV flux from the first stars and AGNs and heated to T~10^4K or 2x10^4K respectively. Earlier...
Virial shocks in galactic haloes? (2003)
Birnboim, Yuval, Dekel, Avishai
We investigate the conditions for the existence of an expanding virial shock in the gas falling within a spherical dark-matter halo. The shock relies on pressure support by the shock-heated gas...
Feedback and the fudamental line of low-luminosity LSB/dwarf galaxies (2002)
We study in simple terms the role of feedback in establishing the scaling relations of low-surface-brightness and dwarf galaxies with stellar masses in the range 6x10^5
Dark-Halo Cusp: Asymptotic Convergence (2002)
Dekel, Avishai, Arad, Itai, Devor, Jonathan, Birnboim, Yuval
We propose a model for how the buildup of dark halos by merging satellites produces a characteristic inner cusp, of a density profile \rho \prop r^-a with a -> a_as > 1, as seen in cosmological...
Galactic halo cusp-core: tidal compression in mergers (2002)
Dekel, Avishai, Devor, Jonathan, Hetzroni, Guy
We explain in simple terms how the buildup of dark haloes by merging compact satellites, as in the CDM cosmology, inevitably leads to an inner cusp of density profile $\rho \propto r^{-\alpha}$ with...
Resolving the Spin Crisis: Mergers and Feedback (2002)
Dekel, Avishai, Maller, Ariyeh H.
We model in simple terms the angular momentum (J) problem of galaxy formation in CDM, and identify the key elements of a scenario that can solve it. The buildup of J is modeled via dynamical friction...
Galactic Halo Cusp versus Core: Tidal Effects in Mergers (2002)
Dekel, Avishai, Devor, Jonathan, Arad, Itai
We show how the buildup of halos by merging satellites forces an inner cusp, with a density profile \rho \propto r^{-\alpha} where \alpha \to \alpha_a \gsim 1$. Our analysis is based on a new...
Towards a Resolution of the Galactic Spin Crisis: Mergers, Feedback, and Spin Segregation (2002)
Maller, Ariyeh H., Dekel, Avishai
We model in simple terms the angular-momentum problems of galaxy formation in CDM cosmologies, and identify the key elements of a scenario that may solve them. The buildup of angular momentum is...
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...
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...
Cosmic Flows: A Status Report (2001)
Courteau, Stephane, Dekel, Avishai
We give a brief review of recent developments in the study of the large-scale velocity field of galaxies since the international workshop on Cosmic Flows held in July 1999 in Victoria, B.C. Peculiar...
Porciani, Cristiano, Dekel, Avishai, Hoffman, Yehuda
We investigate the cross-talk between the two key components of tidal-torque theory, the inertia (I) and shear (T) tensors, using a cosmological N-body simulation with thousands of well-resolved...
Modeling Angular-Momentum History in Dark-Matter Halos (2001)
Maller, Ariyeh H., Dekel, Avishai, Somerville, Rachel S.
We model the acquisition of spin by dark-matter halos in semi-analytic merger trees. We explore two different algorithms; one in which halo spin is acquired from the orbital angular momentum of...
Testing Tidal-Torque Theory: I. Spin Amplitude and Direction (2001)
Porciani, Cristiano, Dekel, Avishai, Hoffman, Yehuda
We evaluate the success of linear tidal-torque theory (TTT) in predicting galactic-halo spin using a cosmological N-body simulation with thousands of well-resolved haloes. The proto-haloes are...
Non-linear Stochastic Galaxy Biasing in Cosmological Simulations (2001)
Rachel Somerville Gerard, Gerard Lemson, Yair Sigad, Avishai Dekel, Guinevere Kauffmann
We study the biasing relation between dark-matter halos or galaxies and the underlying mass distribution, using cosmological N-body simulations in which galaxies are modelled via semi-analytic...
Galaxy Formation at z~3: Constraints from Spatial Clustering (2000)
Wechsler, Risa H., Somerville, Rachel S., Bullock, James S., Kolatt, Tsafrir S., Primack, Joel R., Blumenthal, George R., ...
We use N-body simulations combined with semi-analytic models to compute the clustering properties of modeled galaxies at z~3, and confront these predictions with the clustering properties of the...
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...
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...
Strong Evolution in the Luminosity-Velocity Relation at z>1? (2000)
Bullock, James S., Dekel, Avishai, Primack, Joel R., Somerville, Rachel S.
We present a method for constraining the evolution of the galaxy luminosity-velocity (LV) relation in hierarchical scenarios of structure formation. The comoving number density of dark-matter halos...
Measuring the Nonlinear Biasing Function from a Galaxy Redshift Survey (2000)
Sigad, Yair, Branchini, Enzo, Dekel, Avishai
We present a simple method for evaluating the nonlinear biasing function of galaxies from a redshift survey. The nonlinear biasing is characterized by the conditional mean of the galaxy density...
Cosmic Flows 99: Conference Summary (1999)
I address the following issues: All bulk velocity measurements (but one) are consistent with our standard gravitational instability theory. New accurate data and reconstruction methods allow...
Clustering of high-redshift galaxies: relating LBGs to dark matter halos (1999)
Wechsler, Risa H., Bullock, James S., Somerville, Rachel S., Kolatt, Tsafrir, Primack, Joel R., Blumenthal, George R., ...
We investigate the clustering properties of high-redshift galaxies within three competing scenarios for assigning luminous galaxies to dark matter halos from N-body simulations: a one galaxy per...
Cosmological Parameters and Power Spectrum from Peculiar Velocities (1999)
The power spectrum of mass density fluctuations is evaluated from the Mark III and the SFI catalogs of peculiar velocities by a maximum likelihood analysis, using parametric models for the power...
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...
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...
Evidence for a Positive Cosmological Constant from Flows of Galaxies and Distant Supernovae (1999)
Recent observations of high-redshift supernovae seem to suggest that the global geometry of the Universe may be affected by a `cosmological constant', which acts to accelerate the expansion rate with...
Large-Scale Power Spectrum and Cosmological Parameters from SFI Peculiar Velocities (1999)
Freudling, Wolfram, Zehavi, Idit, Da Costa, Luiz N., Dekel, Avishai, Eldar, Amiram, Giovanelli, Riccardo, ...
We estimate the power spectrum of mass density fluctuations from peculiar velocities of galaxies by applying an improved maximum-likelihood technique to the new all-sky SFI catalog. Parametric models...
Cosmological Implications of Lyman-Break Galaxy Clustering (1998)
Wechsler, Risa H., Gross, Michael A. K., Primack, Joel R., Blumenthal, George R., Dekel, Avishai, Somerville, Rachel S.
We review our analysis of the clustering properties of ``Lyman-break'' galaxies (LBGs) at redshift z~3, previously discussed in Wechsler et al (1998). We examine the likelihood of spikes found by...
Wiener Reconstruction of Large-Scale Structure from Peculiar Velocities (1998)
Zaroubi, Saleem, Hoffman, Yehuda, Dekel, Avishai
We present an alternative, Bayesian method for large-scale reconstruction from observed peculiar velocity data. The method stresses a rigorous treatment of the random errors and it allows...
Galaxy Biasing: Nonlinear, Stochastic and Measurable (1998)
I describe a general formalism for galaxy biasing (Dekel & Lahav 1998) and its application to measurements of beta (=Omega^0.6/b), e.g. via direct comparisons of light and mass and via redshift...
Evaluating Semi-Analytic Halo Merging Histories (1998)
Somerville, Rachel S., Lemson, Gerard, Kolatt, Tsafrir S., Dekel, Avishai
We evaluate the accuracy of semi-analytic merger-trees by comparing them with the merging histories of dark-matter halos in N-body simulations, focusing on the joint distribution of the number of...
Stochastic Nonlinear Galaxy Biasing (1998)
We propose a general formalism for galaxy biasing and apply it to methods for measuring cosmological parameters, such as regression of light versus mass, the analysis of redshift distortions,...
A Local Hubble Bubble from SNe Ia? (1998)
Zehavi, Idit, Riess, Adam G., Kirshner, Robert P., Dekel, Avishai
We analyze the monopole in the peculiar velocities of 44 Type Ia supernovae (SNe Ia) to test for a local void. The sample extends from 20 to 300 Mpc/h, with distances, deduced from light-curve...
Iras Versus Potent Density Fields On Large Scales: Biasing And Omega (1998)
Yair Sigad, Amiram Eldar, Avishai Dekel, Michael A. Strauss, Amos Yahil
The galaxy density field as extracted from the IRAS 1.2 Jy redshift survey is compared to the mass density field as reconstructed by the POTENT method from the Mark III catalog of peculiar...
Implications of Spikes in the Redshift Distribution of $z\sim3$ Galaxies (1997)
Wechsler, Risa H., Gross, Michael A. K., Primack, Joel R., Blumenthal, George R., Dekel, Avishai
We address the high peaks found by Steidel et al (1997) in the redshift distribution of ``Lyman-break'' objects (LBOs) at redshift z~3. The highest spike represents a relative overdensity of 2.6 in...
Cosmological Implications of Large-Scale Flows (1997)
Cosmological implications of the observed large-scale peculiar velocities are reviewed, alone or combined with redshift surveys and CMB data. The latest version of the POTENT method for...
Jeffrey Willick, S. M. Faber, David Burstein, Avishai Dekel, Michael A. Strauss
This is the third in a series of papers in which we assemble and analyze a homogeneous catalog of peculiar velocity data. In Papers I and II, we described the Tully-Fisher (TF) redshift-distance...
Willick, Jeffrey A., Strauss, Michael A., Dekel, Avishai, Kolatt, Tsafrir
We compare Tully-Fisher (TF) data for 838 galaxies within cz=3000 km/sec from the Mark III catalog to the peculiar velocity and density fields predicted from the 1.2 Jy IRAS redshift survey. Our goal...
Dekel, Avishai, Burstein, David, White, Simon D. M.
We were asked to debate the value of the cosmological mass-density parameter Omega. Is Omega_m=1 in accordance with the simplest model? Is Omega_m much smaller as indicated by some observations?...
Willick, Jeffrey A., Courteau, Stephane, Faber, S. M., Burstein, David, Dekel, Avishai, Strauss, Michael A.
This is the third in a series of papers in which we assemble and analyze a homogeneous catalog of peculiar velocity data. In Papers I and II, we described the Tully-Fisher (TF) redshift-distance...
Large-Scale Power-Spectrum from Peculiar Velocities (1995)
Kolatt, Tsafrir, Dekel, Avishai
The power spectrum (PS) of mass density fluctuations, in the range $0.05 \leq k \leq 0.2 \ihmpc$, is derived from the Mark III catalog of peculiar velocities of galaxies, independent of ``biasing"....
Simulating Our Cosmological Neighborhood: Mock Catalogs for Velocity Analysis (1995)
Kolatt, Tsafrir, Dekel, Avishai, Ganon, Galit, Willick, Jeffrey
We describe the construction of an N-body simulation that mimics the true velocity and mass-density fields in a box of side 256\hmpc about the Local Group , and the production of mock catalogs that...
Willick, Jeffrey A., Courteau, Stephane, Faber, Sandra M., Burstein, David, Dekel, Avishai
We have combined five Tully-Fisher (TF) redshift-distance samples for peculiar velocity analysis: the cluster data of Han, Mould and coworkers (1991-93, HM) and Willick (1991, W91CL), and the field...
Dynamics of Cosmic Flows (1994)
CONTENTS: 1. INTRODUCTION 2. GRAVITATIONAL INSTABILITY 3. MEASURING PECULIAR VELOCITIES 4. ANALYSIS OF OBSERVED PECULIAR VELOCITIES 5. PREDICTED MOTIONS FROM THE GALAXY DISTRIBUTION 6. TESTING BASIC...
Large-Scale Mass Distribution Behind the Galactic Plane (1994)
Kolatt, Tsafrir, Dekel, Avishai, Lahav, Ofer
We map the smoothed mass-density distribution in the Galactic zone of avoidance (zoa), within $6000\kms$ of the Local Group, using potent reconstruction from peculiar velocities of galaxies. The...
Evolution of One-Point Distributions from Gaussian Initial Fluctuations (1993)
Kofman, Lev, Bertschinger, Edmund, Gelb, James M., Nusser, Adi, Dekel, Avishai
We study the quasilinear evolution of the one-point probability density functions (PDFs) of the smoothed density and velocity fields in a cosmological gravitating system beginning with Gaussian...
On Nonlinear Approximations to Cosmic Problems with Mixed Boundary Conditions (1993)
Mancinelli, Paul J., Yahil, Amos, Ganon, Galit, Dekel, Avishai
Nonlinear approximations to problems with mixed boundary conditions are useful for predicting large-scale streaming velocities from the density field, or vice-versa. We evaluate the schemes of...
Determining Omega from Peculiar Velocities (1993)
The large-scale dynamics of matter is inferred from the observed peculiar velocities of galaxies via the POTENT procedure. The smoothed fields of velocity and mass-density fluctuations are recovered...
Omega from Velocities in Voids (1993)
We propose a method for deriving a dynamical lower bound on $\Omega$ from diverging flows in low-density regions, based on the fact that large outflows are not expected in a low-$\Omega$ universe....