THE ω -ABSORPTION LINE DISTRIBUTION FUNCTION FOR RANK CORRELATED SLW MODEL PREDICTION OF RADIATIVE TRANSFER IN NON-UNIFORM GASES

2022 ◽  
pp. 108081
Author(s):  
Frédéric André ◽  
Vladimir P. Solovjov ◽  
Brent W. Webb
Keyword(s):  
Distribution Function ◽  
Radiative Transfer ◽  
Absorption Line ◽  
Model Prediction

scholarly journals Modelling intergalactic low ionization metal absorption line systems near the epoch of reionization

2021 ◽  
Vol 502 (1) ◽  
pp. 888-903
Author(s):  
Teresita Suarez ◽  
Avery Meiksin
Keyword(s):  
Radiative Transfer ◽  
Numerical Simulations ◽  
Absorption Line ◽  
Column Density ◽  
Massive Star ◽  
Good Description ◽  
Chemical Abundances ◽  
Metal Absorption ◽  
Density Ratios ◽  
Galactic Haloes

ABSTRACT We interpret observations of intergalactic low ionization metal absorption systems at redshifts z ≳ 5 in terms of pressure-confined clouds. We find clouds confined by the expected pressure of galactic haloes with masses $11\lt \log M_h/h^{-1}\, \mathrm{M}_\odot \lt 12$ provide a good description of the column density ratios between low ionization metal absorbers. Some of the ratios, however, require extending conventional radiative transfer models of irradiated slabs to spherical (or cylindrical) clouds to allow for lines of sight passing outside the cores of the clouds. Moderate depletion of silicon on to dust grains is also indicated in some systems. The chemical abundances inferred span the range between solar and massive-star-dominated stellar populations as may arise in starburst galaxies. The typical H i column densities matching the data correspond to damped Ly α absorbers (DLAs) or sub-DLAs, with sizes of 40 pc to 3 kpc, gas masses 3.5 < log Mc/M⊙ < 8 and metallicites $0.001\!-\!0.01\, \mathrm{Z}_\odot$. Such systems continue to pose a challenge for galaxy-scale numerical simulations to reproduce.

Elements of Math and Physics

2017 ◽  
Author(s):  
Kelly Chance ◽  
Randall V. Martin
Keyword(s):  
Distribution Function ◽  
Radiative Transfer ◽  
Solid Angle ◽  
Diffraction Limit ◽  
Optical Elements ◽  
Emission Properties ◽  
Lambertian Reflectance ◽  
Atmospheric Radiative Transfer ◽  
Directional Reflectance

Concepts and formulas that are generally useful in atmospheric radiative transfer are gathered here for later use. These include units for light wavelengths and frequencies. Optical elements for instrument description and characterization (solid angle descriptions, étendue, and the diffraction limit) are presented. Lambertian reflectance and emission properties are described, and the bi-directional reflectance distribution function, BRDF, introduced.

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