a) b) c) Define the term "standard candle" as used in cosmology. The flux is defined as L 47 Dium where L is the absolute luminosity and Dum is the distance to the radiation source (you may assume << 1). f(Dlum) = = Assume that we have measured the flux to be f = 7.234 10-23Wm-2 and the absolute luminosity is given by L = 3.828 1026 W. Calculate the luminosity distance Dum to the object in Mpc. Calculate the distance modulus for the object of the previous subquestion. Show that the distance modulus can be written as ft x In < ln 1 L 1 400 f (pc)2,
a) b) c) Define the term "standard candle" as used in cosmology. The flux is defined as L 47 Dium where L is the absolute luminosity and Dum is the distance to the radiation source (you may assume << 1). f(Dlum) = = Assume that we have measured the flux to be f = 7.234 10-23Wm-2 and the absolute luminosity is given by L = 3.828 1026 W. Calculate the luminosity distance Dum to the object in Mpc. Calculate the distance modulus for the object of the previous subquestion. Show that the distance modulus can be written as ft x In < ln 1 L 1 400 f (pc)2,
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Transcribed Image Text:a) Define the term "standard candle" as used in cosmology.
b) The flux is defined as
L
f(Dlum)
4TD²
where L is the absolute luminosity and Dum is the distance to the radiation source (you
may assume z << 1).
=
Assume that we have measured the flux to be f = 7.234 10-23Wm-2 and the absolute
luminosity is given by L = 3.828 1026 W. Calculate the luminosity distance Dum to the object
in Mpc.
c) Calculate the distance modulus for the object of the previous subquestion. Show that the
fl
distance modulus u can be written as
μαln
< In
1 L 1
400m f (pc)²,
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