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Cold streams in early massive hot haloes as the main mode of galaxy formation
A. Dekel, Y. Birnboim, G. Engel +7
The massive galaxies in the young universe, ten billion years ago, formed stars at surprising intensities. Although this is commonly attributed to violent mergers, the properties o…
Scaling Relations and the Fundamental Line of the Local Group Dwarf Galaxies
Joanna Woo, Stephane Courteau, Avishai Dekel
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 th…
Tidal Effects and the Environment Dependence of Halo Assembly
Oliver Hahn, Cristiano Porciani, Avishai Dekel +1
We explore a possible origin for the puzzling anti-correlation between the formation epoch of galactic dark-matter haloes and their environment density. This correlation has been r…
Merger Rates of Dark-Matter Haloes
Eyal Neistein, Avishai Dekel
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 r…
Downsizing by Shutdown in Red Galaxies
A. Cattaneo, A. Dekel, S. M. Faber +1
We address the origin of the `downsizing' of elliptical galaxies, according to which the stars in more massive galaxies formed earlier and over a shorter period than those in less…
Predicting the Properties of the Remnants of Dissipative Galaxy Mergers
M. Covington, A. Dekel, T. J. Cox +2
We construct a physically motivated model for predicting the properties of the remnants of gaseous galaxy mergers, given the properties of the progenitors and the orbit. The model…
The effect of galaxy mass ratio on merger--driven starbursts
T. J. Cox, Patrik Jonsson, Rachel S. Somerville +2
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 ga…
Scaling Relations of Spiral Galaxies
S. Courteau, A. A. Dutton, F. van den Bosch +4
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 veloci…
Constructing Merger Trees that Mimic N-Body Simulations
Eyal Neistein, Avishai Dekel
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 -bod…
Gravitational Quenching in Massive Galaxies and Clusters by Clumpy Accretion
Avishai Dekel, Yuval Birnboim
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.…
Star formation in AEGIS field galaxies since z=1.1 . Staged galaxy formation, and a model of mass-dependent gas exhaustion
K. G. Noeske, S. M. Faber, B. J. Weiner +11
We analyze star formation (SF) as a function of stellar mass (M_*) and redshift z in the All Wavelength Extended Groth Strip International Survey (AEGIS), for star-forming field ga…
Bursting and Quenching in Massive Galaxies without Major Mergers or AGNs
Yuval Birnboim, Avishai Dekel, Eyal Neistein
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 accretio…
Properties of Dark Matter Haloes in Clusters, Filaments, Sheets and Voids
Oliver Hahn, Cristiano Porciani, C. Marcella Carollo +1
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 depen…
Natural Downsizing in Hierarchical Galaxy Formation
Eyal Neistein, Frank C. van den Bosch, Avishai Dekel
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 t…
A Revised Model for the Formation of Disk Galaxies: Low Spin and Dark-Halo Expansion
Aaron A. Dutton, Frank C. van den Bosch, Avishai Dekel +1
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 in…
Shapes of Stellar Systems and Dark Halos from Simulations of Galaxy Major Mergers
Gregory S. Novak, Thomas J. Cox, Joel R. Primack +2
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 prola…
The Dissipative Merger Progenitors of Elliptical Galaxies
Avishai Dekel, Thomas, J. Cox
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 p…
Kinematical and Dynamical Modeling of Elliptical Galaxies
G. A. Mamon, E. Lokas, A. Dekel +2
Elements of kinematical and dynamical modeling of elliptical galaxies (Es) are presented. In projection, NFW models resemble Sersic models, but with a very narrow range of shapes (…
Lost and found dark matter in elliptical galaxies
Felix Stoehr, Gary A. Mamon, Avishai Dekel +1
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 dispersio…
Modelling the Galaxy Bimodality: Shutdown Above a Critical Halo Mass
A. Cattaneo, A. Dekel, J. Devriendt +2
We reproduce the blue and red sequences in the observed joint distribution of colour and magnitude for galaxies at low and high redshifts using hybrid N-body/semi-analytic simulati…
On the Correlations of Massive Black Holes with their Host Galaxies
Gregory S. Novak, S. M. Faber, Avishai Dekel
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 q…
Do the low PN velocity dispersions around elliptical galaxies imply that these lack dark matter?
Gary A. Mamon, Avishai Dekel, Felix Stoehr
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 o…
Origin of the Joint Distribution of Structural Parameters in Disc Galaxies
Aaron A. Dutton, Frank C. van den Bosch, Stephane Courteau +1
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 velocit…
Lost & Found Dark Matter in Elliptical Galaxies
A. Dekel, F. Stoehr, G. A. Mamon +3
There is strong evidence that the mass in the Universe is dominated by dark matter, which exerts gravitational attraction but whose exact nature is unknown. In particular, all gala…