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: http://xmm.vilspa.esa.es/sas/8.0.0/doc/omdetect/node48.html
Дата изменения: Wed Oct 22 17:31:27 2008 Дата индексирования: Tue Aug 18 14:54:20 2009 Кодировка: Поисковые слова: п п п п п п п п п п п п п п п п п п п п п п п п п п |
Any object with either a raw count-rate > 60 or flagged as having a mod-8 pattern is considered to have produced a smoke-ring - any other source within or near to the smoke-ring is flagged.
The predicted position of a smoke-ring is obtained from the following:
x (smoke ring) = real(a1 + b1 x + c1 y + d1 x x + e1 y y + f1 x y) + xCentre
where x = xStar - xCentre, y = yStar - yCentre
and a1 = 9.6950, b1 = 1.2052, c1 = 1.1027d-03, d1 = 2.9117d-06 e1 = 1.8790d-06, f1 = 4.2347d-07
y (smoke ring) = real(a2 + b2 x + c2 y + d2 x x + e2 y y + f2 x y) + yCentre
and
a2 = -4.8165, b2 = 5.0884 c2 = 1.2071, d2 = -2.8810d-07, e2 = 1.549d-06, f2 = -1.0783d-06
These coefficients were obtained by Simon Rosen from a least-squares fit to about 100 measured positions of stars and their associated smoke-ring.