Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.mso.anu.edu.au/pfrancis/ObsTech/MagPrac.pdf Дата изменения: Fri Apr 13 08:05:20 2007 Дата индексирования: Tue Oct 2 03:27:42 2012 Кодировка: Поисковые слова: m 5

Magnitude Practice Exercises
1: A quasar has an I-band magnitude of 21.0 (Vega). What is its flux at this wavelength: · In f · In f (answers: 4.48в10
-2 0

W m-2 nm-1, 1.16в10

-3 1

W m-2 Hz-1).

2: A star has V=21.0 and I=20.7 (Vega). What is it's (f) flux in V? and in I? What is the ratio between the two? (answers: 1.45в10
-1 9

W m-2 nm-1, 5.91в10

-2 0

W m-2 nm-1, 2.45).

3: A galaxy has an AB magnitude of 17.3 in the J-band. What is its flux at this wavelength: · In f · In f (answers: 4.37в10
-3 0

W m-2 Hz-1, 7.75в10

-1 9

W m-2 nm-1).