Extract crowded spectra.Gauss profile

Valeev Azamat wrote on May 08, 2007

Hi all.

I use apsum (in pyraf or cl, version 2.12) for
extract spectra if background
is simple and neibour spectra is not prevent.

Can I extract spectra in "hard" case
with gauss profile.
Which task I have use?

Azamat

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Francisco Valdes wrote on May 08, 2007

Dear Azamat,

I think you are asking about "deconvolving" merged spectra? There is nothing in the NOAO spectral packages that does this. The option that is sometimes recommended if you are dealing with two close spectra is to use a one-sided aperture. That means, for example, you define an aperture that extends from the center of the profile to wing on the side away from the other spectrum. This will be a little noiser but it will be less affected by the other spectrum. The relation between the total flux and the partial flux is an "aperture correction"; that is some constant number.

I hope this helps.

Yours,
Frank Valdes

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Valeev Azamat wrote on May 08, 2007

Thanks for help.

Now I made so. I extract my spectra
using apsum with option "strip".
When I combine all lines.

It is not differ that you say.

Azamat

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Last post on May 08, 2007