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Probing Early Clustering with Lyman-Alpha Absorption Lines Beyond the Quasar Redshift
Abraham Loeb, Daniel J. Eisenstein
Groups and clusters of galaxies hosting a quasar can be found through the detection of Lyman-alpha absorption lines beyond the quasar redshift. The effect occurs whenever the disto…
Evidence from Gravitational Lensing for a Non-Thermal Pressure Support in the Cluster of Galaxies A2218
Abraham Loeb, Shude Mao
The central mass distribution of clusters of galaxies can be inferred from gravitationally lensed arcs with known redshifts. For the Abell cluster 2218, this method yields a core m…
Ejection of Fragments in Supernova Explosions
A. Loeb, F. A. Rasio, J. Shaham
Recent observations by the ROSAT X-ray satellite of the Vela supernova remnant have revealed, in addition to the previously identified compact nebula, a nearly circular emitting re…
An Analytical Model for the Triaxial Collapse of Cosmological Perturbations
Daniel J. Eisenstein, Abraham Loeb
We present an analytical model for the non-spherical collapse of overdense regions out of a Gaussian random field of initial cosmological perturbations. The collapsing region is tr…
Collapse of Primordial Gas Clouds and the Formation of Quasar Black Holes
A. Loeb, F. A. Rasio
The formation of quasar black holes during the hydrodynamic collapse of protogalactic gas clouds is discussed. The dissipational collapse and long- term dynamical evolution of thes…
Empirical Constraints on Cosmological Gamma-Ray Bursts
Eric Woods, Abraham Loeb
We place empirical constraints on the physical properties of ray burst events at cosmological distances. In particular we derive probability distributions for the radiation ene…