New study of the line profiles of sodium perturbed by H2 [PDF]
Astronomy and Astrophysics, 2019 The opacity of alkali atoms, most importantly of Na and K, plays a crucial role in the atmospheres of brown dwarfs and exoplanets. We present a comprehensive study of Na–H2 collisional profiles at temperatures from 500 to 3000 K, the temperatures ...
Fernand Spiegelman, Paul Mollière
exaly +2 more sources
Puzzling Lyman-alpha line profiles in green pea galaxies [PDF]
Astronomy and Astrophysics, 2018 Context. The Lyman-alpha (Lyα) line of hydrogen is of prime importance for detecting galaxies at high redshift. For a correct data interpretation, numerical radiative transfer models are necessary due to Lyα resonant scattering off neutral hydrogen atoms.
Daniel Schaerer +2 more
exaly +2 more sources
The shape of broad-line profiles in active galactic nuclei [PDF]
Astronomy and Astrophysics, 2013 Aims. We present a study of the broad optical/UV emission line profiles in AGN (active galactic nuclei) to g et information on the dominant velocity components (turbulence, rotation, etc.) in the central broad-line region (BLR). Methods.
M Zetzl
exaly +3 more sources
IRIS Si iv Line Profiles at Flare Ribbons as Indications of Chromospheric Condensation [PDF]
Astrophysical Journal, 2020 We present temporal variations of the Si iv line profiles at the flare ribbons in three solar flares observed by the Interface Region Imaging Spectrograph.
K. Yu +5 more
semanticscholar +1 more source
Stark Broadening of Zn III Spectral Lines
Universe, 2022 Stark widths for spectral lines within 24 multiplets of Zn III singlets and triplets have been calculated using modified semiempirical method for an electron density of 1017 cm−3 and temperatures from 5000 K up to 100,000 K.
Milan S. Dimitrijević +1 more
doaj +1 more source
Broad Non-Gaussian Fe xxiv Line Profiles in the Impulsive Phase of the 2017 September 10 X8.3-class Flare Observed by Hinode/EIS [PDF]
Astrophysical Journal, 2018 We analyze the spectra of high-temperature Fe xxiv lines observed by the Hinode/Extreme-Ultraviolet Imaging Spectrometer (EIS) during the impulsive phase of the X8.3-class flare on 2017 September 10.
V. Polito +6 more
semanticscholar +1 more source
Stellar Surface Magneto-convection as a Source of Astrophysical Noise. II. Center-to-limb Parameterization of Absorption Line Profiles and Comparison to Observations [PDF]
Astrophysical Journal, 2018 Manifestations of stellar activity (such as star-spots, plage/faculae, and convective flows) are well-known to induce spectroscopic signals often referred to as astrophysical noise by exoplanet hunters.
H. Cegla +11 more
semanticscholar +1 more source
Impact of Molecular Spectroscopy on Carbon Monoxide Abundances from TROPOMI
Remote Sensing, 2020 The impact of SEOM–IAS (Scientific Exploitation of Operational Missions–Improved Atmospheric Spectroscopy) spectroscopic information on CO columns from TROPOMI (Tropospheric Monitoring Instrument) shortwave infrared (SWIR) observations was examined ...
Philipp Hochstaffl +7 more
doaj +1 more source
Possibilities of velocity field analysis from Hinode SOT/SP data
Open Astronomy, 2022 The possibility of analyzing the line of sight (LOS) velocity and its gradient at each point of the Hinode SOT/SP maps using bisector analysis is revealed. A technique for obtaining such gradient is described.
Mozharovsky Sergei G.
doaj +1 more source
On the Stark broadening of Ru III spectral lines [PDF]
Bulletin of Natural Sciences Research, 2021 Stark broadening parameters, full widths at half maximum (FWHM) and shifts for spectral lines within six multiplets of doubly charged ruthenium ions have been calculated, for an electron density of 10 17 cm-3 and temperature range from 10 000 K to 160 ...
Dimitrijevć Milan S.
doaj +1 more source