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35 papers · 2 filters
CMB anisotropies due to cosmological magnetosonic waves
Tina Kahniashvili, Bharat Ratra
We study scalar mode perturbations (magnetosonic waves) induced by a helical stochastic cosmological magnetic field and derive analytically the corresponding cosmic microwave backg…
Discovery of TeV Gamma-Ray Emission from the Cygnus Region of the Galaxy
A. A. Abdo, B. Allen, D. Berley +36
The diffuse gamma radiation arising from the interaction of cosmic ray particles with matter and radiation in the Galaxy is one of the few probes available to study the origin of t…
Late Forming Dark Matter in Theories of Neutrino Dark Energy
Subinoy Das, Neal Weiner
We study the possibility of Late Forming Dark Matter (LFDM), where a scalar field, previously trapped in a metastable state by thermal or finite density effects, begins to oscillat…
SDSS J1029+2623: A Gravitationally Lensed Quasar with an Image Separation of 22.5 Arcseconds
Naohisa Inada, Masamune Oguri, Tomoki Morokuma +16
We report the discovery of a cluster-scale lensed quasar, SDSS J1029+2623, selected from the Sloan Digital Sky Survey. The lens system exhibits two lensed images of a quasar at z_s…
Environmental Dependence of Properties of Galaxies in the Sloan Digital Sky Survey
Changbom Park, Yun-Young Choi, Michael S. Vogeley +2
We investigate the dependence of physical properties of galaxies brighter than M_r=-18.0 in the SDSS on environment, as measured by local density using an adaptive smoothing kernel…
A New Force in the Dark Sector?
Glennys R. Farrar, Rachel A. Rosen
We study the kinematics of dark matter using the massive cluster of galaxies 1E0657-56. The velocity of the "bullet" subcluster has been measured by X-ray emission from the shock f…