The following two graphics are supposed to be the same, but they are not (there is something I am not getting right). After the calculation of m ( z ) (magnitude as a function of redshift) I get the plot of the first link:(adsbygoogle = window.adsbygoogle || []).push({});

-Plot at the bottom (NOT the last one) of

http://www.rqgravity.net/Supernova [Broken] m (z) = constant + 5*log ( 1 + z - (1 + z)^(1/2) )

-Page 7 of http://arxiv.org/abs/astro-ph/9812473

Here the plot is linear; does not diverge in z = 0.

Maybe the answer is that in the second case, the definition of the magnitude includes a filter transmission function (as hinted in Bergstrom, Goobar, Cosmology and particle astrophysics)? I have to hand in this yesterday : P.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Magnitude vs Redshift Supernova 1a

**Physics Forums | Science Articles, Homework Help, Discussion**