Supernova apparent magnitude from galaxy brightness change

[Froddo]

Hello Astro community, I really need help with few assignments!

First one would be about Supernova:
In a distant galaxy a supernova flash occurred. When supernova reached luminosity maximum, galaxy apparent magnitude
was 17,6. Before the supernova flash the galaxy apparent magnitude was 18,0. What was the supernova's apparent magnitude at it's luminosity maximum?

Could you help me solve this and explain it to me ?

Karma !

 

[Mordred]

I believe this is the calculation your looking for

http://en.m.wikipedia.org/wiki/Mass–luminosity_relation

 

[Froddo]

I'm sorry I did a mistake in the text, there's not luminosity mentioned.

In a distant galaxy a supernova flash occurred. When supernova reached brightness maximum, galaxy apparent magnitude
was 17,6. Before the supernova flash the galaxy apparent magnitude was 18,0. What was the supernova's apparent magnitude at it's brightness maximum? What I'm trying to say is that there's no luminosity mentioned, only apparent magnitude. So I'm not sure if the luminosity and mass relation would help in this case.

In short : When the supernova flashed the galaxy had 17.6 apparent magnitude, before the flash it was 18. And I need to find apparent magnitude of the supernova when flash occurred ( supernova reached max)

L.K.

 

[Borek]

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