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10 papers · 2 filters
A statistical study of the luminosity gap in galaxy groups
Saeed Tavasoli, Habib G. Khosroshahi, Ali Koohpaee +2
The luminosity gap between the two brightest members of galaxy groups and clusters is thought to offer a strong test for the models of galaxy formation and evolution. This study fo…
Spitzer Imaging of Herschel-ATLAS Gravitationally Lensed Submillimeter Sources
R. Hopwood, J. Wardlow, A. Cooray +49
We present physical properties of two submillimeter selected gravitationally lensed sources, identified in the Herschel Astrophysical Terahertz Large Area Survey. These submillimet…
Level Crossing Analysis of Cosmic Microwave Background Radiation: A method for detecting cosmic strings
M. Sadegh Movahed, Shahram Khosravi
In this paper we study the footprint of cosmic string as the topological defects in the very early universe on the cosmic microwave background radiation. We develop the method of l…
Curvature Perturbations and non-Gaussianities from Waterfall Phase Transition during Inflation
Ali Akbar Abolhasani, Hassan Firouzjahi, Mohammad Hossein Namjoo
We consider a variant of hybrid inflation where the waterfall phase transition happens during inflation. By adjusting the parameters associated with the mass of the waterfall field…
Anisotropic Inflation from Charged Scalar Fields
Razieh Emami, Hassan Firouzjahi, S. M. Sadegh Movahed +1
We consider models of inflation with U(1) gauge fields and charged scalar fields including symmetry breaking potential, chaotic inflation and hybrid inflation. We show that there e…
Keck/LRIS Spectroscopic Confirmation of Coma Cluster Dwarf Galaxy Membership Assignments
Kristin Chiboucas, R. Brent Tully, Ronald O. Marzke +5
Keck/LRIS multi-object spectroscopy has been carried out on 140 of some of the lowest and highest surface brightness faint (19 < R < 22) dwarf galaxy candidates in the core region…