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Probing Cluster Potentials through Gravitational Lensing of Background X-Ray Sources
Alexandre Refregier, Abraham Loeb
We examine the gravitational lensing effect of a foreground galaxy cluster on the number count statistics of background X-ray sources. The lensing produces a deficit in the number…
H_2 Cooling of Primordial Gas Triggered by UV Irradiation
Zoltan Haiman, Martin Rees, Abraham Loeb
We investigate the formation of molecular hydrogen (H_2) in a primordial H+He gas cloud irradiated by a power-law UV flux. We find that at high densities (>1 cm^{-3}) and low tempe…
Contribution of Bremsstrahlung Emission from Lyman-alpha Clouds to the Microwave Background Fluctuations
Abraham Loeb
I calculate the contribution of Bremsstrahlung emission from Lyman-alpha absorption clouds to the brightness of the microwave sky. The calculation is based only on the assumption t…
Cosmological Formation of Low-Mass Objects
Zoltan Haiman, Anne A. Thoul, Abraham Loeb
We investigate the early formation of bound objects with masses comparable to the cosmological Jeans mass (10^5 solar masses). We follow the growth of isolated spherically symmetri…
Can the Tully-Fisher Relation be the Result of Initial Conditions?
Daniel J. Eisenstein, Abraham Loeb
We use Monte Carlo realizations of halo formation histories and a spherical accretion model to calculate the expected scatter in the velocity dispersions of galactic halos of a giv…
GRAVITATIONAL LENSING OF QUASARS BY THEIR DAMPED LYMAN-ALPHA ABSORBERS
Matthias Bartelmann, Abraham Loeb
Damped Lyman-alpha absorbers are believed to be associated with galactic disks. We show that gravitational lensing can therefore affect the statistics of these systems. First, the…