Results 11 to 20 of about 3,394,545 (251)

The disk emission in single peaked lines for 12 AGNs [PDF]

open access: yesSerbian Astronomical Journal, 2008
The disk emission in the single peaked Broad Emission Lines (BELs) of Active Galactic Nuclei (AGNs) is difficult to detect. In order to find the disk traces in BELs the line profiles were simulated by the simplified model consisting of two components ...
Bon E.
doaj   +3 more sources

NLTE Analysis of High-Resolution H-Band Spectra, V: Neutral Sodium

open access: yesUniverse, 2023
In order to derive sodium abundances and investigate the effects of non-local thermodynamic equilibrium (NLTE) on the formation of H-band Na I lines, we update the sodium atomic model by incorporating collision rates with hydrogen from new quantum ...
Zeming Zhou   +6 more
doaj   +1 more source

Iteration factors in the line formation problem with frequency dependent source function [PDF]

open access: yesSerbian Astronomical Journal, 2010
In this paper some iteration factors families introduced previously to solve the pure line transfer problem are generalized to the case when the back- ground continuum is taken into account.
Kuzmanovska-Barandovska O.
doaj   +3 more sources

On the Stark Broadening of Be II Spectral Lines

open access: yesData, 2020
Calculated Stark broadening parameters of singly ionized beryllium spectral lines have been reported. Three spectral series have been studied within semiclassical perturbation theory.
Milan S. Dimitrijević   +2 more
doaj   +1 more source

coiling as a linear value for making ceramic wall tiles

open access: yesJournal of Architecture, Art & Humanistic Science, 2021
There are many materials that are used in wall tiles such as marble, granite and other materials used, and ceramic tiles remain the best solution because of its material used in it, which is a clay that has high flexibility, which makes it a rich ...
Mona Ebrahim
doaj   +1 more source

Mixing state of oxalic acid containing particles in the rural area of Pearl River Delta, China: implications for the formation mechanism of oxalic acid [PDF]

open access: yesAtmospheric Chemistry and Physics, 2017
The formation of oxalic acid and its mixing state in atmospheric particulate matter (PM) were studied using a single-particle aerosol mass spectrometer (SPAMS) in the summer and winter of 2014 in Heshan, a supersite in the rural area of the Pearl ...
C. Cheng   +27 more
doaj   +1 more source

Review of Rydberg Spectral Line Formation in Plasmas

open access: yesAtoms, 2023
The present review is dedicated to the problem of an array of transitions between highly-excited atomic levels. Hydrogen atoms and hydrogen-like ions in plasmas are considered here. The presented methods focus on calculation of spectral line shapes. Fast
Andrey Yu. Letunov, Valery S. Lisitsa
doaj   +1 more source

AEGIS: Extinction and Star Formation Tracers from Line Emission [PDF]

open access: yes, 2006
Strong nebular emission lines are a sensitive probe of star formation and extinction in galaxies, and the [O II] line detects star forming populations out to z>1.
A. C. Phillips   +10 more
core   +2 more sources

Planetesimal formation starts at the snow line [PDF]

open access: yes, 2017
Planetesimal formation stage represents a major gap in our understanding of the planet formation process. The late-stage planet accretion models typically make arbitrary assumptions about planetesimals and pebbles distribution while the dust evolution ...
Alibert, Yann, Drazkowska, Joanna
core   +2 more sources

Strong [O iii] λ5007 Compact Galaxies Identified from SDSS DR16 and Their Scaling Relations

open access: yesThe Astronomical Journal, 2023
Green-pea galaxies are a special class of star-forming compact galaxies with strong [O iii ] λ 5007 and considered as analogs of high-redshift Ly α -emitting galaxies and potential sources for cosmic reionization.
Weiyu Ding   +13 more
doaj   +1 more source

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