Results 81 to 90 of about 318,282 (266)

Search for Linear Polarization of the Cosmic Background Radiation [PDF]

Physical Review Letters, 1979
We present preliminary measurements of the linear polarization of the cosmic microwave background (3 K blackbody) radiation. These ground-based measurements are made at 9-mm wavelength. We find no evidence for linear polarization, and set an upper limit for a polarized component of 0.8 mK with 95% confidence level. This implies that the present rate of
Lubin, P M, Smoot, G F
openaire   +6 more sources

Contribution of Unresolved Sources to Diffuse Gamma-Ray Emission from the Galactic Plane

The Astrophysical Journal
The diffuse gamma-ray emission from the Milky Way serves as a crucial probe for understanding the propagation and interactions of cosmic rays within our Galaxy.
Jiayin He, Houdun Zeng, Yi Zhang, Qiang Yuan, Rui Zhang, Jun Li   +5 more
doaj   +1 more source

The Atacama Cosmology Telescope: Systematic Transient Search of 3 Day Maps

The Astrophysical Journal, 2023
We conduct a systematic search for transients in 3 yr of data (2017–2019) from the Atacama Cosmology Telescope (ACT). ACT covers 40% of the sky at three bands spanning from 77–277 GHz. Analysis of 3 day mean-subtracted sky maps, which were match filtered
Yaqiong Li, Emily Biermann, Sigurd Naess, Simone Aiola, Rui An, Nicholas Battaglia, Tanay Bhandarkar, Erminia Calabrese, Steve K. Choi, Kevin T. Crowley, Mark Devlin, Cody J. Duell, Shannon M. Duff, Jo Dunkley, Rolando Dünner, Patricio A. Gallardo, Yilun Guan, Carlos Hervías-Caimapo, Adam D. Hincks, Johannes Hubmayr, Kevin M. Huffenberger, John P. Hughes, Arthur Kosowsky, Thibaut Louis, Maya Mallaby-Kay, Jeff McMahon, Federico Nati, Michael D. Niemack, John Orlowski-Scherer, Lyman Page, Maria Salatino, Cristóbal Sifón, Suzanne T. Staggs, Cristian Vargas, Eve M. Vavagiakis, Yuhan Wang, Edward J. Wollack   +36 more
doaj   +1 more source

Cosmic Gamma-ray Background Radiation [PDF]

arXiv, 2014
The cosmic gamma-ray background radiation is one of the most fundamental observables in the gamma-ray band. Although the origin of the cosmic gamma-ray background radiation has been a mystery for a long time, the Fermi gamma-ray space telescope has recently measured it at 0.1-820 GeV and revealed that the cosmic GeV gamma-ray background is composed of ...
arxiv  

An electronic radiation of blackbody: Cosmic electron background [PDF]

arXiv, 2008
The Universe owns the electronic radiation of blackbody at temperature 2.725 K, which we call the cosmic electron background. We calculate its radiation spectrum. The energy distribution of number density of electrons in the cosmic electron background becomes zero as energy goes to both zero and infinity.
arxiv  

Measurements of the Cosmic Background Radiation [PDF]

, 1986
Maps of the large scale structure (θ>6 °) of the cosmic background radiation covering 90% of the sky are now available. The data show a very strong 50–100 σ (statistical error) dipole component, interpreted as being due to our motion, with a direction of α = 11.25 ± 0.15 hours, δ = -5.6 ± 2.0° The inferred direction of the velocity of our galaxy ...
Philip Lubin, Thyrso Villela
openaire   +2 more sources

Analysis of cosmic microwave background radiation in the presence of Lorentz violation [PDF]

arXiv, 2007
We examine the effects Lorentz violation on observations of cosmic microwave background radiation. In particular, we focus on changes in polarization caused by vacuum birefringence. We place stringent constraints on previously untested violations.
arxiv  

Balloon-Based Measurements of the Cosmic Background Radiation [PDF]

1974 International Conference on Submillimeter Waves and Their Applications, 1974
We have developed and flown a balloon-borne liquid-heliumcooled spectrometer to measure the cosmic background radiation in the 3 -18-cm/sup -1/ region. It features a cooled horn antenna, a polarizing Michelson interferometer, and a germanium bolometer. These design features and the performance of the instrument are discussed.
Mather, John C., Richards, Paul L., Woody, David P.   +2 more
openaire   +2 more sources

Low Background Radiation Detection Techniques and Mitigation of Radioactive Backgrounds

Frontiers of Physics, 2020
The study of rare fundamental physics phenomena, such as double-beta decay, rare nuclear decays and dark matter, requires very low levels of background radiation in order to observe a signal.
M. Laubenstein, I. Lawson
semanticscholar   +1 more source

Microwave Background, Backgrounds Hierarchy - Polyphony of Universe [PDF]

arXiv, 2001
We discuss the structure, physical nature, dynamic genesis of clearly detected diffuse backgrounds (radiations) in the Universe. From the point of view of Wave Universe concept it is shown, that observed Backgrounds Hierarchy (Polyphony of Universe) is close connected and causely determined by the sound velocity Hierarchy of the physical medium, cosmic
arxiv