Results 11 to 20 of about 606 (180)
Beam-axis stability during gantry rotation measured with scintillation dosimetry. [PDF]
J Appl Clin Med PhysAbstract Purpose Volumetric modulated arc therapy (VMAT) requires high mechanical precision due to continuous gantry rotation. This study aims to investigate beam‐axis stability during VMAT delivery and evaluate scintillation‐based imaging as a complementary quality assurance (QA) tool.
Ohira S +9 more
europepmc +2 more sources
ALMA View of the High-velocity-dispersion Compact Cloud CO 0.02–0.02 at the Galactic Center
The Astrophysical Journal, 2023 We report the results of observations toward the center of the molecular cloud CO 0.02–0.02 made using the Atacama Large Millimeter/Submillimeter Array.
Yuhei Iwata +4 more
doaj +1 more source
Outflows and disks of brown dwarfs with SMA, CARMA and ALMA
EPJ Web of Conferences, 2013 Brown dwarfs are on the dividing line between planets and stars. Up to date, about 1,000 brown dwarfs, including the coolest known brown dwarfs with temperatures of ∼300 K as cool as the human body, have been discovered.
Tho Do D. +4 more
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Submillimeter Wave Astronomy [PDF]
1976 International Conference on Submillimeter Waves and Their Applications, 1976 Scientific Overview Astronomical observations at submillimeter wavelengths, between 40 μm and 1 mm, study astro-physical sources and problems which differ from and complement those accessible at other wavelengths. Although a few nonthermal sources are known, most of the radiation observed in this spectral band from astronomical sources outside of the ...
openaire +2 more sources
A Low Noise Receiver for Submillimeter Astronomy [PDF]
SPIE Proceedings, 1986 A broadband, low noise heterodyne receiver, suitable for astronomical use, has been built using a Pb alloy superconducting tunnel junction (SIS). The RF coupling is quasioptical via a bowtie antenna on a quartz lens and is accomplished without any tuning elements.
Wengler, M. J. +3 more
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ALMA Millimeter/Submillimeter Sources among Spitzer SMUVS Galaxies at z > 2 in the COSMOS Field
The Astrophysical Journal, 2023 Submillimeter observations reveal the star formation activity obscured by dust in the young Universe. It still remains unclear how galaxies detected at submillimeter wavelengths are related to ultraviolet/optical-selected galaxies in terms of their ...
Tomoko L. Suzuki +2 more
doaj +1 more source
The Astrophysical Journal, 2023 We present a sample of 30 massive (log( M _* / M _⊙ ) > 11) z = 3–5 quiescent galaxies selected from the Spitzer-HETDEX Exploratory Large Area (SHELA) Survey and observed at 1.1 mm with Atacama Large Millimeter/submillimeter Array (ALMA) Band 6 ...
Katherine Chworowsky +13 more
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The Astrophysical Journal Supplement Series, 2023 The Atacama Large Millimeter/submillimeter Array high-frequency long-baseline campaign in 2019 (HF-LBC-2019) was arranged to undertake band 9 (690 GHz) and 10 (850 GHz) observations using the longest 16 km baselines in order to explore calibration ...
Luke T. Maud +8 more
doaj +1 more source
The Submillimeter Wave Astronomy Satellite [PDF]
International Astronomical Union Colloquium, 1990 AbstractThe Submillimeter Wave Astronomy Satellite (SWAS) is a NASA Small-Explorer Class experiment whose objective is to study both the chemical composition and the thermal balance in dense (NH2 > 103 cm−3) molecular clouds and, by observing many clouds throughout our galaxy, relate these conditions to the processes of star formation.
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The Astronomical JournalIn this paper, we report on the current status and performance of the balanced superconductor-insulator-superconductor (SIS) receiver suite developed for the Leighton Chajnantor Telescope (LCT).
Duo Cao +7 more
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