2005/06/25 | Number Counts
类别(¤〖天文〗) | 评论(0) | 阅读(27) | 发表于 13:58
Counting the number N of astronomical objects out to a distance r by luminosity gives
(1)

but the flux satisfies
(2)

so
(3)

For magnitude,
(4)

(5)

where a is the expansion parameter and is the luminosity distance.
(6)

(7)

(8)

(9)

(10)

(11)

(12)

(13)

(14)

(15)

(16)

(17)

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