High Energy Astrophysics Solutions to Exercises 1. ... P R c r The flux density received at point P is: F= I cos d c = I cos sin d d = I sin 2 =2 I 0 cos sin d c = R2 I ----r2 That is, we recover the inverse square law. ... F d = size of circular aperture I L Circular aperture L sec d d cos Projected aperture d cos d First calculate the solid angle of rays hitting P the back of the camera. ... Because of the delta-function, F =A Hence, for an unresolved source, the flux per beam F source. ...
... Printed in U.S.A. THE STELLAR DISK THICKNESS OF LOW SURFACE BRIGHTNESS GALAXIES D. Bizyaev 1,2,3 and S. Kajsin 4 Received 2003 October 23; accepted 2004 June 9 ABSTRACT We present surface photometry results for a sample of 11 edge-on galaxies observed with the 6 m telescope at the Special Astrophysical Observatory, Russia. ... We find from a comparison of photometric scales that the stellar disks of LSB galaxies are thinner than those of high surface brightness ( HSB) galaxies. ... UGC 11301 .. ...
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Ссылки http://www.mso.anu.edu.au/~kcf/surya/spiralstructure/Bizyaev04 -- 2057.9 Кб -- 09.07.2007 Похожие документы