20 papers · 1 filter
Mass and Gas Profiles in A1689: Joint X-ray and Lensing Analysis
Doron Lemze, Rennan Barkana, Tom J. Broadhurst +1
We carry out a comprehensive joint analysis of high quality HST/ACS and Chandra measurements of A1689, from which we derive mass, temperature, X-ray emission and abundance profiles…
Detecting Early Galaxies Through Their 21-cm Signature
Smadar Naoz, Rennan Barkana
New observations over the next few years of the emission of distant objects will help unfold the chapter in cosmic history around the era of the first galaxies. These observations…
The Difference PDF of 21-cm Fluctuations: A Powerful Statistical Tool for Probing Cosmic Reionization
Rennan Barkana, Abraham Loeb
A new generation of radio telescopes are currently being built with the goal of tracing the cosmic distribution of atomic hydrogen at redshifts 6-15 through its 21-cm line. The obs…
On Correlated Random Walks and 21-cm Fluctuations During Cosmic Reionization
Rennan Barkana
Analytical approaches to galaxy formation and reionization are based on the mathematical problem of random walks with barriers. The statistics of a single random walk can be used t…
The formation and gas content of high redshift galaxies and minihalos
Smadar Naoz, Rennan Barkana
We investigate the suppression of the baryon density fluctuations compared to the dark matter in the linear regime. Previous calculations predict that the suppression occurs up to…
The Physics and Early History of the Intergalactic Medium
Rennan Barkana, Abraham Loeb
The intergalactic medium - the cosmic gas that fills the great spaces between the galaxies - is affected by processes ranging from quantum fluctuations in the very early universe t…