1.7k citations · 21.3k across the 218 of their papers we have counts for
40 papers · 1 filter
Large scale galactic turbulence: can self-gravity drive the observed HI velocity dispersions?
Oscar Agertz, George Lake, Romain Teyssier +3
Observations of turbulent velocity dispersions in the HI component of galactic disks show a characteristic floor in galaxies with low star formation rates and within individual gal…
Hydrodynamical Adaptive Mesh Refinement Simulations of Disk Galaxies
Brad K. Gibson, Stephanie Courty, Patricia Sanchez-Blazquez +4
To date, fully cosmological hydrodynamic disk simulations to redshift zero have only been undertaken with particle-based codes, such as GADGET, Gasoline, or GCD+. In light of the (…
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…
Antimatter cosmic rays from dark matter annihilation: First results from an N-body experiment
J. Lavalle, E. Nezri, F. -S. Ling +2
[Abridged]. We take advantage of the galaxy-like 3D dark matter map extracted from the HORIZON Project results to calculate the positron and antiproton fluxes from dark matter anni…
Numerical simulations of galaxy evolution in cosmological context
Marie Martig, Frederic Bournaud, Romain Teyssier
Large volume cosmological simulations succeed in reproducing the large-scale structure of the Universe. However, they lack resolution and may not take into account all relevant phy…
Full-Sky Weak Lensing Simulation with 70 Billion Particles
Romain Teyssier, Sandrine Pires, Simon Prunet +7
We have performed a 70 billion dark-matter particles N-body simulation in a 2 Gpc periodic box, using the concordance, cosmological model as favored by the latest WMAP3 re…
Cosmic velocity--gravity relation in redshift space
Stéphane Colombi, Michał Chodorowski, Romain Teyssier
We propose a simple way to estimate the parameter beta = Omega_m^(0.6)/b from three-dimensional galaxy surveys. Our method consists in measuring the relation between the cosmologic…
The dynamical state of A548 from XMM-Newton data: X-ray and radio connection
L. Solovyeva, S. Anokhin, L. Feretti +5
We present a detailed study of the X-ray properties of the galaxy cluster Abell 548b (z=0.04), using XMM-Newton data, and discuss the connection between the thermal properties and…
Initial Conditions for Large Cosmological Simulations
S. Prunet, C. Pichon, D. Aubert +3
This technical paper describes a software package that was designed to produce initial conditions for large cosmological simulations in the context of the Horizon collaboration. Th…
FASTLens (FAst STatistics for weak Lensing) : Fast method for Weak Lensing Statistics and map making
S. Pires, J. -L. Starck, A. Amara +3
With increasingly large data sets, weak lensing measurements are able to measure cosmological parameters with ever greater precision. However this increased accuracy also places gr…
Cosmological MHD simulation of a cooling flow cluster
Y. Dubois, R. Teyssier
Various observations of magnetic fields in the Intra-Cluster Medium (ICM), most of the time restricted to cluster cores, point towards field strength of the order of a few microG (…
Bimodal gas accretion in the Horizon-MareNostrum galaxy formation simulation
P. Ocvirk, C. Pichon, R. Teyssier
(abridged) The physics of diffuse gas accretion and the properties of the cold and hot modes of accretion onto proto-galaxies between z=2 and z=5.4 is investigated using the large…
Protostellar collapse: A comparison between SPH and AMR calculations
Benoit Commercon, Patrick Hennebelle, Edouard Audit +2
The development of parallel supercomputers allows today the detailed study of the collapse and the fragmentation of prestellar cores with increasingly accurate numerical simulation…
Gamma ray and Neutrino fluxes from a cosmological dark matter simulation
E. Athanassoula, F. -S. Ling, E. Nezri +1
In this paper, we estimate the gamma-ray and neutrino fluxes coming from dark matter annihilation in a Milky Way framework provided by a recent N-BODY HORIZON simulation. We first…
The distant galaxy cluster CL0016+16: X-ray analysis up to
L. Solovyeva, S. Anokhin, J. L. Sauvageot +2
To study the mass distribution of galaxy clusters up to their Virial radius, CL0016+16 seems to be a good candidate,since it is a bright massive cluster, previously considered as b…
Magnetic processes in a collapsing dense core. II Fragmentation. Is there a fragmentation crisis ?
P. Hennebelle, R. Teyssier
Abridged. A large fraction of stars are found in binary systems. It is therefore important for our understanding of the star formation process, to investigate the fragmentation of…
Numerical methods comparison for protostellar collapse calculations
B. Commercon, P. Hennebelle, E. Audit +2
The development of parallel supercomputers allows today the detailed study of the collapse and the fragmentation of prestellar cores with increasingly accurate numerical simulation…
A radiative transfer scheme for cosmological reionization based on a local Eddington tensor
Dominique Aubert, Romain Teyssier
A radiative transfer scheme is presented, based on a moment description of the equation of radiative transfer and the so-called ``M1 closure model'' for the Eddington tensor. This…
On the onset of galactic winds in quiescent star forming galaxies
Yohan Dubois, Romain Teyssier
We studied the effect of supernovae feedback on a disk galaxy, taking into account the impact of infalling gas on both the star formation history and the corresponding outflow stru…
AGN self-regulation in cooling flow clusters
A. Cattaneo, R. Teyssier
We use three-dimensional high-resolution adaptive-mesh-refinement simulations to investigate if mechanical feedback from active galactic nucleus jets can halt a massive cooling flo…
Fundamental differences between SPH and grid methods
Oscar Agertz, Ben Moore, Joachim Stadel +17
We have carried out a hydrodynamical code comparison study of interacting multiphase fluids. The two commonly used techniques of grid and smoothed particle hydrodynamics (SPH) show…
Transverse and longitudinal correlation functions in the Intergalactic Medium from 32 close pairs of high-redshift quasars
F. Coppolani, P. Petitjean, F. Stoehr +6
We present the transverse flux correlation function of the Lyman-alpha forest in quasar absorption spectra at z~2.1 from VLT-FORS and VLT-UVES observations of a total of 32 pairs o…
Archeops In-flight Performance, Data Processing and Map Making
J. F. Macias-Perez, G. Lagache, B. Maffei +69
Archeops is a balloon--borne experiment widely inspired by the Planck satellite and by its High Frequency Instrument (HFI). It is mainly dedicated to measure the Cosmic Microwave B…
Kinematic Dynamos using Constrained Transport with High Order Godunov Schemes and Adaptive Mesh Refinement
R. Teyssier, S. Fromang, E. Dormy
We propose to extend the well-known MUSCL-Hancock scheme for Euler equations to the induction equation modeling the magnetic field evolution in kinematic dynamo problems. The schem…