1.4k citations · 42.7k across the 723 of their papers we have counts for
10 papers · 2 filters
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…
Stable and Unstable Accretion Flows with Angular Momentum near a Point Mass
Dongsu Ryu, Garry L. Brown, Jeremiah P. Ostriker +1
The properties of axisymmetric accretion flows of cold adiabatic gas with zero total energy in the vicinity of a Newtonian point mass are characterized by a single dimensionless pa…
REMOVING DEGENERACY OF MICROLENSING LIGHT CURVES THROUGH NARROW-BAND PHOTOMETRY OF GIANTS
Abraham Loeb, Dimitar Sasselov
The standard light curve of a microlensing event provides only two constraints on the six unknown parameters of the lens. We show that narrow-band photometry during a microlensing…
Empirical Constraints on Source Properties and Host Galaxies of Cosmological Gamma-Ray Bursts
Eric Woods, Abraham Loeb
We discuss several constraints on the properties of gamma-ray bursts (GRB) at cosmological distances. First we use the requirement that burst sources must be optically thin to pair…
COSMOLOGICAL ORIGIN OF QUASARS
Abraham Loeb
Quasars are the earliest objects known to exist. We examine their origin in the context of popular models for structure formation in the universe. We show that seeds for quasar bla…