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Small-scale Substructure in Dark Matter Haloes: Where Does Galaxy Formation Come to an End?
James E. Taylor, Joseph Silk, Arif Babul
Models of structure formation based on cold dark matter predict that most of the small dark matter haloes that first formed at high redshift would have merged into larger systems b…
Isocurvature Fluctuations Induce Early Star Formation
Naoshi Sugiyama, Saleem Zaroubi, Joseph Silk
The early reionisation of the Universe inferred from the WMAP polarisation results, if confirmed, poses a problem for the hypothesis that scale-invariant adiabatic density fluctuat…
MeV Dark Matter: Has It Been Detected?
Celine Boehm, Dan Hooper, Joseph Silk +1
We discuss the possibility that the recent detection of 511 keV gamma-rays from the galactic bulge, as observed by INTEGRAL, is a consequence of low mass (~MeV) particle dark matte…
Microlensing Candidates in M87 and the Virgo Cluster with the Hubble Space Telescope
Edward A. Baltz, Tod R. Lauer, David R. Zurek +4
The position of the giant elliptical galaxy M87 at the center of the Virgo Cluster means that the inferred column density of dark matter associated with both the cluster halo and t…
WIMP matter power spectra and small scale power generation
C. Boehm, H. Mathis, J. Devriendt +1
Dark Matter (DM) is generally assumed to be massive, cold and collisionless from the structure formation point of view. A more correct statement however is that DM indeed experienc…
Kinetic SZ effect and CMB polarization from subsonic bulk motions of dense gas clouds in galaxy cluster cores
J. M. Diego, P. Mazzotta, J. Silk
Recent CHANDRA observations have revealed the presence of cold fronts in many clusters of galaxies. The cold fronts are believed to be produced by the bulk motions of massive, dens…
Massive black hole remnants of the first stars III: observational signatures from the past
Ranty R. Islam, James E. Taylor, Joseph Silk
The first stars forming in minihaloes at redshifts greater than 20 may have been very massive and could have left behind massive black hole (MBH) remnants. In previous papers we in…
Massive black hole remnants of the first stars II: optical and X-ray signatures in present-day galactic haloes
Ranty R. Islam, James E. Taylor, Joseph Silk
The first stars forming in minihaloes at redshifts greater than 20 may have been very massive and could have left behind massive black hole (MBH) remnants. In a previous paper we i…
Massive black hole remnants of the first stars I: abundance in present-day galactic haloes
Ranty R. Islam, James E. Taylor, Joseph Silk
We investigate the possibility that present-day galaxies and their dark matter haloes contain a population of massive black holes (MBHs) that form by hierarchical merging of the bl…
Recombining WMAP: constraints on ionizing and resonance radiation at recombination
Rachel Bean, Alessandro Melchiorri, Joe Silk
We place new constraints on sources of ionizing and resonance radiation at the epoch of the recombination process using the recent CMB temperature and polarization spectra coming f…
Cosmological constraints from the cluster contribution to the power spectrum of the soft X-ray background. New evidence for a low sigma_8
J. M. Diego, W. Sliwa, J. Silk +2
We use the X-ray power spectrum of the ROSAT all-sky survey in the R6 band (approximately 0.9-1.3 keV) to set an upper limit on the galaxy cluster power spectrum. The cluster power…
Top-Down Fragmentation of a Warm Dark Matter Filament
Alexander Knebe, Julien Devriendt, Brad Gibson +1
We present the first high-resolution n-body simulations of the fragmentation of dark matter filaments. Such fragmentation occurs in top-down scenarios of structure formation, when…