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identify
identify spectral lines
List possible lines in the specified energy range.
| Syntax: | identify | <energy><delta_energy><redshift><line_list> |
|---|
The energy range searched is <energy>
<energy>
(keV) in the rest frame of the source. If working in wavelength mode, as
set by the setplot command, then the <energy> and <delta energy>
parameters should be entered as wavelengths (in Angstroms).
<line list> specifies the list of lines to be searched. The options are:
- bearden, which searches the Bearden compilation of fluorescence lines
(Bearden, J.A., 1967, Rev.Mod.Phys. 39, 78)
- mekal, which uses the lines from the mekal model (q.v.)
- apec, which uses the APEC
http://www.atomdb.org/
line list. The apec option takes an additional two arguments: the temperature of
the plasma (keV) and a minimum emissivity of lines to be shown. If the command
xset has been used to set APECROOT, then identify uses the APECROOT
value to define the new atomic physics data files. See the help on the apec model
for details.
- spex, which uses the SPEX
https://spex-xray.github.io/spex-help/
line list. The spex option takes an additional two arguments: the temperature of
the plasma (keV) and a minimum emissivity of lines to be shown. If the command
xset has been used to set SPEXROOT, then identify uses the SPEXROOT
value to define the new atomic physics data files. See the help on the apec model
for details.
The line list files must be downloaded to the local machine before use.
This can be done with the ftgetmodeldata tool. For more details on model
data files see
https://heasarc.gsfc.nasa.gov/docs/software/xspec/modeldata.html.
- bearden: use bearden for the modelname parameter in ftgetmodeldata.
- mekal: the line file will be downloaded along with the required mekal model data files when modelname is any of the mekal family of models.
- apec: the line file will be downloaded along with the required apec model data files when modelname is any of the apec family of models.
- spex: the line file will be downloaded along with the required spex model data files when modelname is any of the spex family of models.