Gravitational heating, clumps, overheating (2009)
There is no shortage of energy around to solve the overcooling problem of cooling flow clusters. AGNs, as well as gravitational energy are both energetic enough to balance the cooling of cores of...
Magnetically Regulated Gas Accretion in High-Redshift Galactic Disks (2009)
Disk galaxies are in hydrostatic equilibrium along their vertical axis. The pressure allowing for this configuration consists of thermal, turbulent, magnetic and cosmic ray components. For the Milky...
The Kinetic Sunyaev-Zel'dovich effect of the Milky Way Halo (2009)
Birnboim, Yuval, Loeb, Abraham
We calculate the expected imprint of the ionized gas in the Milky-Way halo on the Cosmic Microwave Background (CMB) through the kinetic Sunyaev-Zel'dovich (kSZ) effect. Unlike other Galactic...
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...
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...
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,...
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...
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...