منابع مشابه
Blackbody Radiation in Optically Thick Gases?
In this work, the claim that optically thick gases can emit as blackbodies is refuted. The belief that such behavior exists results from an improper consideration of heat transfer and reflection. When heat is injected into a gas, the energy is primarily redistributed into translational degrees of freedom and is not used to drive emission. The average kinetic energy of the particles in the syste...
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We have conducted a long-slit search for low surface brightness Ly emitters at redshift 2:67 < z < 3:75. A 92 hr long exposure with the ESOVLTFORS2 instrument down to a 1 surface brightness detection limit of 8 ; 10 20 erg cm 2 s 1 arcsec 2 per arcsec aperture yielded a sample of 27 single line emitters with fluxes of a few ;10 18 erg s 1 cm . We present arguments that most objects are indeed L...
متن کاملRed Thick Disks of Nearby Galaxies
Edge on systems reveal the properties of disk galaxies as a function of height, z, above the plane. Four local edge-on galaxies, that are close enough to have been resolved into stars by the Hubble Space Telescope, show thick disks, composed of a red stellar population, which is old and relatively metal rich. Color gradients, ∆(V-I)/∆z, are zero or slightly positive. Favored models may have an ...
متن کاملTheory of radiative shocks in optically thick media
The theory of radiative shocks in optically thick media is discussed, using exact relations for the fluid dynamics quantities. A quantitative, semianalytic approach to the radiation transport is presented here, based on the observation that the mean intensity is essentially constant through the cooling layer. This permits a self-consistent three-layer solution, in which the temperature upstream...
متن کاملFaraday rotation density measurements of optically thick alkali metal vapors
We investigate the measurement of alkali number densities using the Faraday rotation of linearly polarized light. We "nd that the alkali number density may be reliably extracted even in regimes of very high bu!er gas pressure, and very high alkali number density. We have directly veri"ed our results in potassium using absorption spectroscopy on the second resonance (4 SP5 P). 2001 Published by ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1991
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/253.3.496