Results 31 to 40 of about 1,574,076 (309)
Shock Excitation in Narrow-line Regions Powered by AGN Outflows
The Astrophysical Journal, 2023 Outflows in an active galactic nucleus (AGN) are considered to play a key role in the evolution of the host galaxy through transfer of a large amount of energy.
Misaki Mizumoto +12 more
doaj +1 more source
An aperture of 21 cm telescope with polarized coaxial for satellite laser ranging
Frontiers in Physics, 2023 With the development of aerospace and space scientific research, satellite laser ranging (SLR) has put forward higher requirements for response speed, data density, and measurement accuracy. In coaxial common optical path laser ranging, the emitted laser
Mingliang Long +10 more
doaj +1 more source
Satellite laser ranging at ultra-high PRF of hundreds of kilohertz all day
Frontiers in Physics, 2022 Satellite laser ranging (SLR) had been operated at a pulse repetition frequency (PRF) from ∼10 Hz to 10 kHz; the ultra-high PRF of SLR (UH-SLR) is a trend of development.
Mingliang Long +9 more
doaj +1 more source
Metallicities of Classical Cepheids in the Inner Galactic Disk
The Astrophysical Journal, 2023 Metallicity gradients refer to the sloped radial profiles of the metallicities of gas and stars and are commonly seen in disk galaxies. A well-defined metallicity gradient of the Galactic disk is observed particularly well with classical Cepheids, which ...
Noriyuki Matsunaga +16 more
doaj +1 more source
Open questions on carbon-based molecules in space
Communications Chemistry, 2022 It has been a great joint achievement of astronomy, laboratory spectroscopy and quantum chemistry to identify interstellar molecules in various astronomical environments and piece together their origins story from the fragmented evidence.
Christopher S. Hansen +3 more
doaj +1 more source
EXPLANATION: Exoplanet and Transient Event Investigation Project—Optical Facilities and Solutions
Photonics, 2022 Over the past decades, the achievements in astronomical instrumentation have given rise to a number of novel advanced studies related to the analysis of large arrays of observational data.
Gennady Valyavin +50 more
doaj +1 more source
Laboratory spectroscopy and astronomical significance of the fully-benzenoid PAH triphenylene and its cation [PDF]
, 2017 V. Kofman +4 more
semanticscholar +2 more sources
The Robotic Multiobject Focal Plane System of the Dark Energy Spectroscopic Instrument (DESI)
The Astronomical Journal, 2022 A system of 5020 robotic fiber positioners was installed in 2019 on the Mayall Telescope, at Kitt Peak National Observatory. The robots automatically retarget their optical fibers every 10–20 minutes, each to a precision of several microns, with a ...
Joseph Harry Silber +100 more
doaj +1 more source
Spectroscopy For Cool Astronomical Objects [PDF]
, 2014 Session V: Astronomy and Astrophysics. June 25, 2014.
J. S. A. Brooke +3 more
openaire +2 more sources