Galaxy
Group

Interpretation of galaxy spectra with STECKMAP

In progress: A user guide for STECKMAP

I am currently writing a user guide for the package, which should centralise most of the information on this web page and much more. The (largely) unfinished version can be found here.

The STECMAP and STECKMAP inversion methods have been grouped in a single package, along with a ready-to-use collection of the latest SSP models. The inversion routines in this package also involve a newly introduced flux-recalibration routine, which accounts for possible flux-calibration error in the data. No publication has yet been submitted on this very topic, but if you can read french, you will find an accurate description in my PhD thesis. This situation will change very soon, though, as I am preparing a paper about this. In the present version of the package, the user can choose between linear interpolation between the nodes as described in my thesis, or cubic splines, which gives a smoother recalibration.

This package is a powerful toolkit for whoever wishes to interpret the stellar absorption features of integrated light spectra of stellar populations. It is written in yorick. The package is freely available from this page . Be sure to fetch the most recent archive (something like STECKMAP_laptop_ddmmyyyy.tar). If you are not sure which one to get ask me (pierre.ocvirk --_--AT--_-- astro.unistra.fr). The reason for the large size of this archive is the several different SSP models which are packed in binary format. You will also find a README which explains the installation and setup, and also a small tutorial to get started. As an extension to this, an example yorick file demonstrating a typical STECKMAP run, along with comments, is available here and should prove very useful to new users. In the near future, STECKMAP will evolve to be called from the shell command line rather than from yorick-issued commands, in order to allow the yorick part to be hidden. This will prevent the user from having to learn yorick, although one should be able to achieve a good control of execution simply by tweaking the example file and retaining little or no yorick specificities. However, it is worth pointing out that yorick is a powerful and free alternative to idl.

A STECKMAP ONLINE SERVICE FOR INTERPRETING GALAXY SPECTRA

You can now interpret your spectra using the online version of STECKMAP. Just upload your spectrum as a fits file, set up a few parameters, and submit. STECKMAP runs on the remote server, which will deliver your results in about a minute for typical medium resolution optical spectra from existing instruments. The service can be accessed here .

Need help ? ask the author

Dont hesitate to ask me questions or ask for help if you have problems with installation/running the code: pierre.ocvirk --_--AT--_-- astro.unistra.fr

Work in progress: A tcl GUI for STECKMAP

In order to make the code even more user-friendly, I am currently working on a graphical user interface which should make things easier. See the small presentation I gave about it, including some screenshots, here.

Models References

As stated above, the STECKMAP package contains a ready-to-use collection of SSP models. The references to cite when using any of them are the following:
  • BC03: Bruzual G., Charlot S., 2003, MNRAS, 344, 1000
  • GD05: SED@: Delgado R. M. G., Cervino M., Martins L. P., Leitherer G., Hauschildt P. H., 2005, MNRAS, 357, 945
  • PHR: PEGASE-HR: Le Borgne D., Rocca-Volmerange B., Prugniel P., Lancon A., Fioc M., Soubiran C., 2004, A&A, 425, 881
  • MILES: models computed by Vazdekis et al. (in prep), using the dutch-spanish MILES library. <\li>

Method papers references

The inverse methods STECMAP and STECKMAP implemented in the package are presented in two papers accepted in MNRAS, to be published imminently. At the moment, the references in astro-ph are the following:

Applications: Papers using STECKMAP

Here is a short list of papers using STECKMAP in galaxy formation and evolution studies, in a variety of applications and regimes. The list is biased towards refereed papers rather than proceedings to give a synthetic view.

Last update: 8th of April 2010 Contact