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New Frontiers in Cosmology and Galaxy Formation: Challenges for the Future
Richard Ellis, Joseph Silk
(Abridged) Cosmology faces three distinct challenges in the next decade. (1) The dark sector, both dark matter and dark energy, dominates the Universe. Key questions include determ…
Recent star formation in high-redshift early-type galaxies: insights from the rest-frame UV
S. Kaviraj, S. K. Yi, E. Gawiser +4
We combine deep UBVRIzJK photometry from the MUSYC survey with redshifts from the COMBO-17 survey to study the rest-frame ultraviolet (UV) properties of 674 high-redshift (0.5<z<1)…
Secondary anisotropies of the CMB
Nabila Aghanim, Subhabrata Majumdar, Joseph Silk
The Cosmic Microwave Background fluctuations provide a powerful probe of the dark ages of the universe through the imprint of the secondary anisotropies associated with the reionis…
The role of minor mergers in the recent star formation history of early-type galaxies
Sugata Kaviraj, Sebastien Peirani, Sadegh Khochfar +2
We demonstrate that the large scatter in the ultra-violet (UV) colours of intermediate-mass early-type galaxies in the local Universe and the inferred low-level recent star formati…
Hydrostatic equilibrium of a porous intracluster medium: implications for mass fraction and X-ray luminosity
Adi Nusser, Joe Silk
The presence of dilute hot cavities in the intracluster medium (ICM) at the cores of clusters of galaxies changes the relation between gas temperature and its X-ray emission proper…
Solving the cosmic lithium problems with primordial late-decaying particles
Daniel Cumberbatch, Kazuhide Ichikawa, Masahiro Kawasaki +3
We investigate the modifications to predictions for the abundances of light elements from standard Big-Bang nucleosynthesis when exotic late-decaying particles with lifetimes excee…
The UV colours of high-redshift early-type galaxies: evidence for recent star formation and stellar mass assembly over the last 8 billion years
S. Kaviraj, S. Khochfar, K. Schawinski +7
We combine deep UBVRIzJK photometry from the Multiwavelength Survey by Yale-Chile (MUSYC) with redshifts from the COMBO-17 survey to perform a large-scale study of the rest-frame u…
Accounting for the Unresolved X-ray Background with Sterile Neutrino Dark Matter
Daniel Cumberbatch, Joseph Silk
We consider a scenario where keV sterile neutrinos constitute all of the currently inferred dark matter abundance, whose radiative decays could potentially account for the flux con…
Gamma-ray emission from dark matter wakes of recoiled black holes
Roya Mohayaee, Jacques Colin, Joe Silk
A new scenario for the emission of high-energy gamma-rays from dark matter annihilation around massive black holes is presented. A black hole can leave its parent halo, by means of…
On the Magnitude of Dark Energy Voids and Overdensities
David F. Mota, Douglas J. Shaw, Joseph Silk
We investigate the clustering of dark energy within matter overdensities and voids. In particular, we derive an analytical expression for the dark energy density perturbations, whi…
Monolithic or hierarchical star formation? A new statistical analysis
Marios Kampakoglou, Roberto Trotta, Joe Silk
We consider an analytic model of cosmic star formation which incorporates supernova feedback, gas accretion and enriched outflows, reproducing the history of cosmic star formation,…
A new test of the light dark matter hypothesis
Celine Boehm, Joseph Silk
Detection of a surprisingly high flux of positron annihilation radiation from the inner galaxy has motivated the proposal that dark matter is made of weakly interacting light parti…
Ages of Elliptical Galaxies: Single versus Multi Population Interpretation
T. P. Idiart, J. Silk, J. A. de Freitas Pacheco
New calibrations of spectrophotometric indices of elliptical galaxies as functions of spectrophotometric indices are presented, permitting estimates of mean stellar population ages…
Is WMAP3 normalization compatible with the X-Ray cluster abundance?
Gustavo Yepes, Raul Sevilla, Stefan Gottloeber +1
We present the mass and X-ray temperature functions derived from a sample of more than 15,000 galaxy clusters of the MareNostrum Universe cosmological SPH simulations. In these sim…
The Evolving Faint-End of the Luminosity Function
S. Khochfar, J. Silk, R. A. Windhorst +1
We investigate the evolution of the faint-end slope of the luminosity function, , using semi-analytical modeling of galaxy formation. In agreement with observations, we find tha…
On prospects for dark matter indirect detection in the Constrained MSSM
Leszek Roszkowski, Roberto Ruiz de Austri, Joe Silk +1
In the framework of the Constrained MSSM we derive the most probable ranges of the diffuse gamma radiation flux from the direction of the Galactic center and of the positron flux f…
Constraints on CPT violation from WMAP three year polarization data: a wavelet analysis
Paolo Cabella, Paolo Natoli, Joseph Silk
We perform a wavelet analysis of the temperature and polarization maps of the Cosmic Microwave Background (CMB) delivered by the WMAP experiment in search for a parity violating si…
Dark matter caustics and the enhancement of self-annihilation flux
Roya Mohayaee, Sergei Shandarin, Joseph Silk
Cold dark matter haloes are populated by caustics, which are yet to be resolved in N-body simulations or observed in the Universe. Secondary infall model provides a paradigm for th…
Cross-correlation studies as a probe of reionization physics
Anze Slosar, Asantha Cooray, Joseph Silk
The process of reionization is now believed to have proceeded in an orchestrated manner beginning with UV photons emitted by high redshift galaxies containing a large fraction of P…
Cosmological constraints in the presence of ionizing and resonance radiation at recombination
Rachel Bean, Alessandro Melchiorri, Joe Silk
With the recent measurement of full sky cosmic microwave background polarization from WMAP, key cosmological degeneracies have been broken, allowing tighter constraints to be place…
Can large-scale structure probe CMB-constrained non-Gaussianity?
X. Kang, P. Norberg, J. Silk
The first year Wilkinson Microwave Anisotropy Probe (WMAP) set quantitative constraints on the amplitude of any primordial non-Gaussianity. We run a series of dark matter-only N-bo…