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The Mass-Concentration-Redshift Relation of Cold Dark Matter Halos
Aaron D. Ludlow, Julio F. Navarro, Raul E. Angulo +4
We use the Millennium Simulation series to investigate the mass and redshift dependence of the concentration of equilibrium cold dark matter (CDM) halos. We extend earlier work on…
The impact of angular momentum on black hole accretion rates in simulations of galaxy formation
Y. M. Rosas-Guevara, R. G. Bower, J. Schaye +7
Feedback from energy liberated by gas accretion onto black holes (BHs) is an attractive mechanism to explain the exponential cut-off at the massive end of the galaxy stellar mass f…
N-body Dark Matter Haloes with simple Hierarchical Histories
Lilian Jiang, John C. Helly, Shaun Cole +1
We present a new algorithm which groups the subhaloes found in cosmological N- body simulations by structure finders such as SUBFIND into dark matter haloes whose formation histori…
Constraining the WDM Particle Mass with Milky Way Satellites
Rachel Kennedy, Carlos Frenk, Shaun Cole +1
Well-motivated particle physics theories predict the existence of particles (such as sterile neutrinos) which acquire non-negligible thermal velocities in the early universe. These…
Extending the halo mass resolution of -body simulations
Raul E. Angulo, Carlton M. Baugh, Carlos S. Frenk +1
We present a scheme to extend the halo mass resolution of N-body simulations of the hierarchical clustering of dark matter. The method uses the density field of the simulation to p…
The Integrated Sachs-Wolfe effect in gravity
Yan-Chuan Cai, Baojiu Li, Shaun Cole +2
We study the late-time Integrated Sachs-Wolfe (ISW) effect in gravity using N-body simulations. In the model under study, the linear growth rate is larger than that i…
The properties of warm dark matter haloes
Mark R. Lovell, Carlos S. Frenk, Vincent R. Eke +3
Well-motivated elementary particle candidates for the dark matter, such as the sterile neutrino, behave as warm dark matter (WDM).For particle masses of order a keV, free streaming…
How well can cold-dark-matter substructures account for the observed lensing flux-ratio anomalies?
D. D. Xu, Dominique Sluse, Liang Gao +4
Lensing flux-ratio anomalies are most likely caused by gravitational lensing by small-scale dark matter structures. These anomalies offer the prospect of testing a fundamental pred…
Streams in the Aquarius stellar haloes
Facundo A. Gómez, Amina Helmi, Andrew P. Cooper +3
We use the very high resolution, fully cosmological simulations from the Aquarius project, coupled to a semi-analytical model of galaxy formation, to study the phase-space distribu…
Galaxy and Mass Assembly (GAMA): galaxy radial alignments in GAMA groups
Michael D. Schneider, Shaun Cole, Carlos S. Frenk +10
We constrain the distributions of projected radial alignment angles of satellite galaxy shapes within the Galaxy And Mass Assembly survey group catalogue. We identify the galaxy gr…
Hierarchical clustering in chameleon gravity
Wojciech A. Hellwing, Baojiu Li, Carlos S. Frenk +1
We use a suite of high resolution state-of-the-art N-body Dark Matter simulations of chameleon gravity to study the higher order volume averaged correlation functions $\bar{…
Constraints on black hole fuelling modes from the clustering of X-ray AGN
N. Fanidakis, A. Georgakakis, G. Mountrichas +6
We present a clustering analysis of X-ray selected AGN by compiling X-ray samples from the literature and re-estimating the dark matter (DM) halo masses of AGN in a uniform manner.…
The most luminous quasars do not live in the most massive dark matter haloes at any redshift
N. Fanidakis, A. V. Maccio, C. M. Baugh +2
Quasars represent the brightest Active Galactic Nuclei (AGN) in the Universe and are thought to indicate the location of prodigiously growing Black Holes (BHs), with luminosities a…
Enriching the hot circumgalactic medium
Robert A. Crain, Ian G. McCarthy, Joop Schaye +2
Models of galaxy formation in a CDM universe predict that massive galaxies are surrounded by a hot, quasi-hydrostatic circumgalactic corona of slowly cooling gas, predominantly acc…
Galactic accretion and the outer structure of galaxies in the CDM model
Andrew P. Cooper, Richard D'Souza, Guinevere Kauffmann +5
We have combined the semi-analytic galaxy formation model of Guo et al. (2011) with the particle-tagging technique of Cooper et al. (2010) to predict galaxy surface brightness prof…
The Mass Profile and Accretion History of Cold Dark Matter Halos
Aaron D. Ludlow, Julio F. Navarro, Michael Boylan-Kolchin +6
We use the Millennium Simulation series to study the relation between the accretion history (MAH) and mass profile of cold dark matter halos. We find that the mean density within t…
Galaxy And Mass Assembly (GAMA): Spectroscopic analysis
A. M. Hopkins, S. P. Driver, S. Brough +79
The Galaxy And Mass Assembly (GAMA) survey is a multiwavelength photometric and spectroscopic survey, using the AAOmega spectrograph on the Anglo-Australian Telescope to obtain spe…
Spatial and luminosity distributions of galactic satellites
Quan Guo, Shaun Cole, Vincent Eke +2
We investigate the luminosity functions (LFs) and projected number density profiles of galactic satellites around isolated primaries of different luminosities. We measure these qua…
A Possible Cold Imprint of Voids on the Microwave Background Radiation
Yan-Chuan Cai, Mark C. Neyrinck, Istvan Szapudi +2
We measure the average temperature decrement on the cosmic microwave background (CMB) produced by voids selected in the SDSS DR7 spectroscopic redshift galaxy catalog, spanning red…