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For more information

This documentation manual covers the basic usage of the Weeds extension. More detailed information on each command is available using the Gildas online help, e.g.:

[fontsize=\footnotesize]
WEEDS\MODSOURCE = "python weeds/modsource.py"
        [WEEDS\]MODSOURCE MODFILE ANTSIZE [/BACKGROUND TBG] [/VERBOSE]
 
    Model the emission of a source at the  local  thermodynamic  equilibrium
    (LTE). The model paramaters (column density, kinetic temperature, source
    size, line width and velocity offset for each species) are read from MOD-
    FILE.  The modeled antenna temperature is stored in the TA_MODEL memory.
    For convenience the current spectra is also stored in a memory, OBS,  so
    one can easily overplot the result of the model on the observed spectra.
 
    Arguments:
      MODFILE     the name of the file containing the parameters.  The  file
                  should one line per species with six columns containing re-
                  spectively:
 
                  1) The species name
                  2) The column density for this species in cm-2
                  3) The exitation temperature in K
                  4) The source size in arcsecs
                  5) The offset velocity from the source VLSR, in km/s
                  6) The line FWHM in km/s
 
                  Lines that start with a "#" are treated as comments.
 
      ANTSIZE     the antenna size in meters
 
    Options:
      /BACKGROUND set the background temperature to TBG, in  K.  Default  is
                  2.73.
 
      /VERBOSE    prints  partition function, lines frequencies, upper level
                  energies and degeneracies, Einstein coefficients and opac-
                  ity at the line center.

For a more detailed description of the Weeds extension, we refer the interested reader to Maret, Hily-Blant, Pety et al., Astronomy & Astrophysics, in prep. (2010). This paper describes the implementation of the extension, and gives more details on the spectroscopic databases that it uses, and explains how spectrum are modeled.

The users interested in the development of the Weeds extension may consult the Weeds developers' wiki6. Weeds developers can be contacted by email at weeds-devel@obs.ujf-grenoble.fr. Bug reports should also be sent to this list. The list as a public archive7.


next up previous
Next: List of contributing authors Up: weeds Previous: Modeling a spectrum
Gildas manager 2011-04-01