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The soft X-ray Cluster-AGN spatial cross-correlation function in the ROSAT-NEP survey
N. Cappelluti, H. Boehringer, P. Schuecker +4
X-ray surveys facilitate investigations of the environment of AGNs. Deep Chandra observations revealed that the AGNs source surface density rises near clusters of galaxies. The nat…
The Effects of Dark Matter Decay and Annihilation on the High-Redshift 21 cm Background
Steven Furlanetto, S. Peng Oh, Elena Pierpaoli
The radiation background produced by the 21 cm spin-flip transition of neutral hydrogen at high redshifts can be a pristine probe of fundamental physics and cosmology. At z~30-300,…
Constraining Isocurvature Initial Conditions with WMAP 3-year data
Rachel Bean, Joanna Dunkley, Elena Pierpaoli
We present constraints on the presence of isocurvature modes from the temperature and polarization CMB spectrum data from the WMAP satellite alone, and in combination with other da…
Bayesian foreground analysis with CMB data
H. K. Eriksen, C. Dickinson, C. R. Lawrence +6
The quality of CMB observations has improved dramatically in the last few years, and will continue to do so in the coming decade. Over a wide range of angular scales, the uncertain…
A new cosmic microwave background constraint to primordial gravitational waves
Tristan L. Smith, Elena Pierpaoli, Marc Kamionkowski
Primordial gravitational waves (GWs) with frequencies > 10^{-15} Hz contribute to the radiation density of the Universe at the time of decoupling of the cosmic microwave background…
Impact of dark matter decays and annihilations on reionization
M. Mapelli, A. Ferrara, E. Pierpaoli
One of the possible methods to distinguish among various dark matter candidates is to study the effects of dark matter decays. We consider four different dark matter candidates (li…