Add method to LineCollection object to create Spectra

[stephenmwilkins]

It will be useful to be able to generate a line contribution spectrum from a LineCollection instance. This would allow us e.g. to create more appropriate spectra when downsampling or converting the wavelength grid.

[WillJRoper]

@stephenmwilkins can you give more details as to what you mean? It's not clear to me what you are asking for.

[stephenmwilkins]

If you have the luminosities of a set of lines you should be able to create a spectrum just using those lines, assuming you know the wavelengths. To do this properly you need to assume some line width but in the default instance you can assume all the photons are in a single resolution element.

[WillJRoper]

So that's effectively just a scatter plot?

[stephenmwilkins]

You could represent it by a scatter plot (wavelength_i, luminosity_i) but what we want is an actual spectrum. Obviously (depending on the resolution) some resolution elements (bins) will have a contribution from more than one line.

[WillJRoper]

Ah ok, I'm with you now