Results 21 to 30 of about 669,418 (322)

High-Efficiency, 80 mm Aperture Metalens Telescope. [PDF]

open access: yesNano letters (Print), 2022
Metalenses promise potential for a paradigm shift of conventional optical devices. However, the aperture sizes of metalenses are usually bound within hundreds of micrometers by the commonly used fabrication methods, limiting their usage on practical ...
Lidan Zhang   +7 more
semanticscholar   +1 more source

Turbulent parameters at different heights in the atmosphere. Shack–Hartmann wavefront sensor data

open access: yesSolar-Terrestrial Physics, 2022
The paper presents the results of studies of wavefront distortions at different heights in the atmosphere. We have used measurement wavefront data to determine optical turbulence parameters along the line of sight of the Large Solar Vacuum Telescope ...
Shikhovtsev A. Y.   +5 more
doaj   +1 more source

The European Solar Telescope [PDF]

open access: yesAstronomy & Astrophysics, 2022
The European Solar Telescope (EST) is a project aimed at studying the magnetic connectivity of the solar atmosphere, from the deep photosphere to the upper chromosphere.
C. Noda   +17 more
semanticscholar   +1 more source

Highly Reflective Silver-Enhanced Coating with High Adhesion and Sulfurization Resistance for Telescopes

open access: yesNanomaterials, 2022
Highly reflective metal coatings are essential for manufacturing reflecting telescope mirrors to achieve the highest reflectivity with broad spectral bandwidth.
Hsing-Yu Wu   +6 more
doaj   +1 more source

In-flight performance and calibration of the Infrared Array Camera (IRAC) for the Spitzer Space Telescope [PDF]

open access: yesSPIE Astronomical Telescopes + Instrumentation, 2004
The Infrared Array Camera (IRAC) is one of three focal plane instruments on board the Spitzer Space Telescope. IRAC is a four-channel camera that obtains simultaneous broad-band images at 3.6, 4.5, 5.8, and 8.0 μm in two nearly adjacent fields of view ...
G. Fazio   +64 more
semanticscholar   +1 more source

Optical Design of a Novel Wide-Field-of-View Space-Based Spectrometer for Climate Monitoring

open access: yesSensors, 2022
We report on a near-infrared imaging spectrometer for sensing the three most prominent greenhouse gases in the atmosphere (water vapor, carbon dioxide and methane).
Luca Schifano   +3 more
doaj   +1 more source

THE LARGE AREA TELESCOPE ON THE FERMI GAMMA-RAY SPACE TELESCOPE MISSION [PDF]

open access: yes, 2009
The Large Area Telescope (Fermi/LAT, hereafter LAT), the primary instrument on the Fermi Gamma-ray Space Telescope (Fermi) mission, is an imaging, wide field-of-view (FoV), high-energy γ-ray telescope, covering the energy range from below 20 MeV to more ...
W. Atwood   +239 more
semanticscholar   +1 more source

First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole [PDF]

open access: yesAstrophysical Journal, 2019
We present measurements of the properties of the central radio source in M87 using Event Horizon Telescope data obtained during the 2017 campaign. We develop and fit geometric crescent models (asymmetric rings with interior brightness depressions) using ...
K. Akiyama   +213 more
semanticscholar   +1 more source

The Atacama Cosmology Telescope: DR4 maps and cosmological parameters [PDF]

open access: yesJournal of Cosmology and Astroparticle Physics, 2020
We present new arcminute-resolution maps of the Cosmic Microwave Background temperature and polarization anisotropy from the Atacama Cosmology Telescope, using data taken from 2013–2016 at 98 and 150 GHz. The maps cover more than 17,000 deg2, the deepest
S. Aiola   +139 more
semanticscholar   +1 more source

Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant [PDF]

open access: yes, 1998
We present here the final results of the Hubble Space Telescope (HST) Key Project to measure the Hubble constant. We summarize our method, the results, and the uncertainties, tabulate our revised distances, and give the implications of these results for ...
W. Freedman   +14 more
semanticscholar   +1 more source

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