منابع مشابه
On Mixed Brightness-integrals
We establish the greatest upper bound for the product of the i-th brightness-integrals of a convex body and its polar dual. Further, the greatest upper bound for the product of the brightness-integrals of order p of a convex body and its polar dual is also given.
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15 صفحه اولNote on a polytropic β−model to fit the X-ray surface brightness of clusters of galaxies
In this note, I suggest that the β−model used to fit the X-ray surface brightness profiles of extended sources, like groups and clusters of galaxies, has to be corrected when the counts are collected in a wide energy band comparable to the mean temperature of the source and a significant gradient in the gas temperature is observed. I present a revised version of the β−model for the X-ray bright...
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Context. It is well known that the bright and remote Galactic globular cluster NGC 2419 has a very peculiar structure. In particular its half-light radius is significantly larger than that of ordinary globular clusters of similar luminosity, being as large as that of the brightest nuclei of dwarf elliptical galaxies. Aims. In this context it is particularly worth to check the reliability of the...
متن کاملOn the determinants of surface brightness.
The brightness of an achromatic surface with luminance S on an achromatic background with luminance B varies with S, with B, and with the luminance step deltaL at the border of the surface. In agreement with previous findings indicating that the visual system can perform as a photometer, the results of the two experiments reported here show that S and B determined surface brightness independent...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1878
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/38.9.526