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Constraining the Beaming of Gamma-Ray Bursts With Radio Surveys
Rosalba Perna, Abraham Loeb
The degree of beaming in Gamma-Ray Bursts (GRBs) is currently unknown. The uncertainty in the gamma-ray beaming angle, theta, leaves the total energy release (proportional to theta…
Measuring the Virial Temperature of Galactic Halos Through Electron Scattering of Quasar Emission Lines
Abraham Loeb
Semi-analytic models of galaxy formation postulate the existence of virialized gaseous halos around galaxies at high redshifts. A small fraction of the light emitted by any high-re…
A Sub-Relativistic Shock Model for the Radio Emission of SN1998bw
Eli Waxman, Abraham Loeb
SN1998bw is the most luminous radio supernova ever observed. Previous discussions argued that its exceptional radio luminosity, 4e38 erg/s, must originate from a highly relativisti…
Determining the Redshift of Reionization From the Spectra of High-Redshift Sources
Zoltan Haiman, Abraham Loeb
The redshift at which the universe was reionized is currently unknown. We examine the optimal strategy for extracting this redshift, z_{reion}, from the spectra of early sources. F…
The First Stars and Quasars
Abraham Loeb
The first star clusters and quasars resulted directly from the growth of linear density fluctuations in the early Universe. Since they emerged from a well-defined set of initial co…
Are HI Supershells the Remnants of Gamma-Ray Bursts?
Abraham Loeb, Rosalba Perna
Gamma-Ray Bursts (GRBs) are thought to originate at cosmological distances from the most powerful explosions in the Universe. If GRBs are not beamed then the distribution of their…
Constraints from the Hubble Deep Field on High Redshift Quasar Models
Zoltan Haiman, Piero Madau, Abraham Loeb
High resolution, deep imaging surveys are instrumental in setting constraints on semi-analytical structure formation models in Cold Dark Matter (CDM) cosmologies. We show here that…
X-Ray Absorption by the Hot Intergalactic Medium
Rosalba Perna, Abraham Loeb
The current census of observed baryons in the local Universe is still missing a significant fraction of them according to standard Big-Bang nucleosynthesis. Numerical simulations p…
The Expected Rate of Gamma-Ray Burst Afterglows In Supernova Searches
Eric Woods, Abraham Loeb
We predict the rate at which Gamma-Ray Burst (GRB) afterglows should be detected in supernova searches as a function of limiting flux. Although GRB afterglows are rarer than supern…
Direct Measurement of Cosmological Parameters from the Cosmic Deceleration of Extragalactic Objects
Abraham Loeb
The redshift of all cosmological sources drifts by a systematic velocity of order a few m/s over a century due to the deceleration of the Universe. The specific functional dependen…