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Thread: calculating redshift

  1. #1 calculating redshift 
    Forum Freshman
    Join Date
    Dec 2008
    can anyone list the calculations for working out the redshift?

    Distance = 200 Mpc

    Hubble constant = H0 = 73 km s1 Mpc-1?

    Speed of light c = 3.0 105 km s1

    Do I need to convert something first?

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  3. #2  
    Moderator Moderator Dishmaster's Avatar
    Join Date
    Apr 2008
    Heidelberg, Germany
    You need the cosmological model as well. You can play around with the constants on this or that website. Assuming

    you need a redshift value of

    to be consistent with 200 Mpc. Note that this assumption is based on a flat universe with . Other geometries are also possible changing the distance vs. redshift relation considerably.

    A simple calculation can be done with the following assumptions:

    With being the distance. Then you get:

    You see that these simple assumptions give you the right magnitude of the redshift value, but not the correct value.

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