Results 61 to 70 of about 6,884 (245)

Measurements of the Cosmic Background Radiation [PDF]

Annual Review of Astronomy and Astrophysics, 1980
Measurements of the attributes of the 2.7-K microwave background radiation (CBR) are reviewed, with emphasis on the analytic phase of CBR studies. Methods for the direct measurement of the CBR spectrum are discussed; attention is given to receivers, antennas, absolute receiver calibration, atmospheric emission and absorption, the galactic background ...
openaire   +2 more sources

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

Reconstructing the late Pleistocene glacial history of the Cairngorm Mountains, Scotland, using paired cosmogenic 10Be and 14C

Journal of Quaternary Science, EarlyView.
ABSTRACT Chronologic and geomorphic evidence of past glaciations is largely recorded in areas at relatively low elevation and/or landscapes defined by high glacial erosion. As a result, data from areas that did not experience significant glacial erosion and the highest elevation locations are lacking from reconstructions of past ice masses.
Samuel E. Kelley, Alice M. Doughty, Nathaniel Lifton, Simon Pendleton, Cormac O'Brien, Graeme Warren   +5 more
wiley   +1 more source

CMB-S4: Iterative Internal Delensing and r Constraints

The Astrophysical Journal
The tightest constraints on the tensor-to-scalar ratio r can only be obtained after removing a substantial fraction of the lensing B -mode sample variance.
Sebastian Belkner, Julien Carron, Louis Legrand, Caterina Umiltà, Clem Pryke, Colin Bischoff, CMB-S4 Collaboration   +6 more
doaj   +1 more source

Recovering Cosmic Microwave Background Polarization Signals with Machine Learning

The Astrophysical Journal, 2023
Primordial B-mode detection is one of the main goals of current and future cosmic microwave background (CMB) experiments. However, the weak B-mode signal is overshadowed by several Galactic polarized emissions, such as thermal dust emission and ...
Ye-Peng Yan, Guo-Jian Wang, Si-Yu Li, Jun-Qing Xia   +3 more
doaj   +1 more source

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

Luminescence dating of palaeoshoreline deposits from Khyargas Nuur, Western Mongolia: A comparative study of multigrain and single‐grain K‐feldspar dating

Journal of Quaternary Science, EarlyView.
ABSTRACT The evolution of lakes in western Mongolia and their responses to climate changes and glacial meltwater input remain poorly understood. This study evaluates the reliability of multigrain and single‐grain K‐feldspar post‐infrared infrared stimulated luminescence (IRSL) (pIRIR) dating applied to palaeoshoreline sediments at Khyargas Nuur ...
Neda Rahimzadeh, Dennis Wolf, Sumiko Tsukamoto, Manfred Frechen, Frank Lehmkuhl   +4 more
wiley   +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

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

A cross‐correlator‐based timing tool for FemtoMAX

Journal of Synchrotron Radiation, EarlyView.
A novel timing tool suited for FemtoMAX is described. This will allow sub‐100 fs time‐resolved measurements at FemtoMAX.We report on the commissioning of an ultrafast timing diagnostic for measuring a time‐offset signal between two different synchronized ultrashort light pulses.
D. Kroon, E. Nilsson, B. Ahn, M. Bertelli, R. Calarco, I. Clementsson, S. De Simone, J. C. Ekström, A. Jurgilaitis, M. Longo, V. T. Pham, J. Larsson   +11 more
wiley   +1 more source