a) Define the term “standard candle” as used in cosmology b). The flux is defined as f(Dlum) = L /4πD2lum , where L is the absolute luminosity and Dlum 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 1026W. Calculate the luminosity distance Dlum to the object in Mpc. c). Calculate the distance modulus µ for the object of the previous subquestion. Show that the distance modulus µ can be written as given in image
a) Define the term “standard candle” as used in cosmology b). The flux is defined as f(Dlum) = L /4πD2lum , where L is the absolute luminosity and Dlum 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 1026W. Calculate the luminosity distance Dlum to the object in Mpc. c). Calculate the distance modulus µ for the object of the previous subquestion. Show that the distance modulus µ can be written as given in image
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a) Define the term “standard candle” as used in cosmology
b). The flux is defined as f(Dlum) = L /4πD2lum , where L is the absolute luminosity and Dlum 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 1026W. Calculate the luminosity distance Dlum to the object in Mpc.
c). Calculate the distance modulus µ for the object of the previous subquestion. Show that the distance modulus µ can be written as given in image
Transcribed Image Text:b) The flux is defined as
L
f(Dlum)
4 Dum
where L is the absolute luminosity and Dlum is the distance to the radiation source (you
may assume z << 1).
=
Assume that we have measured the flux to be f 7.234 10-23 Wm-2 and the absolute
luminosity is given by L = 3.828 1026 W. Calculate the luminosity distance Dum to the object
in Mpc.
Transcribed Image Text:c) Calculate the distance modulus μ for the object of the previous subquestion. Show that the
н
distance modulus u can be written as
μα In (pc)²).
1 L 1
400T f (pc)2
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