apsum. Width of profile

Valeev Azamat wrote on Apr 26, 2007

Hi, all!

I don`t understand how it work.
I start
> apsum myfitsimage background="none" pfit="fit2d"
and extract my spectra. but I need know
a width of profile for every wavelentgh.
(to control it for strong line)
How I can see?

I also need image after spectra extracting
because there is nebula spectra in this image.
Can I get this image in output?

I also have question about background
extraction. Whan I use background
I calculate background for avery line.
How I can compute background
for three-four average lines?

Thanks a lot!

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Francisco Valdes wrote on Apr 26, 2007

Hi,

Currently the APEXTRACT package tasks, such as apsum, provide only a constant width extraction aperture. That means the width is the same at all wavelengths. The width is something you define either with parameters or with the aperture editor. The information may be found in text files in the database so you can look at those files to see the aperture width. See the help pages for some information about the format.

If you want to use APEXTRACT to extract a 2D strip use "format=strip" in the parameters to apsum.

As you see there are several choices for background estimation. In any of these cases you can set the parameter "skybox" to moving average the sky values before subtraction.

Yours,
Frank Valdes

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Valeev Azamat wrote on Apr 26, 2007

I am found this option too. Now I use it.

Thanks.
Azamat

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Last post on Apr 26, 2007