- #1
SUDOnym
- 90
- 1
As an assignment I am trying to calculate the Hubble redshift by looking at spectra of galaxies...
Obviously the very first thing I want to do is find a suitable emission line...i am trying to find the halpha line in all the spectra I am analysing.
First off, there is a very large spike in the spectra I am looking at at a wavelength of around 650nm and I am guessing that this must be the halpha. But my question is, why is it that this halpha line should definitely be an emission line as opposed to an absorption line?
Obviously the very first thing I want to do is find a suitable emission line...i am trying to find the halpha line in all the spectra I am analysing.
First off, there is a very large spike in the spectra I am looking at at a wavelength of around 650nm and I am guessing that this must be the halpha. But my question is, why is it that this halpha line should definitely be an emission line as opposed to an absorption line?