Determine the expected line equivalent width of a fluorescent line.
XSPEC> thleqw [<line energy> <line fluorescent yield>
<absorption edge energy> <upper energy limit>
<bin number> <log or lin> <max edge depth>]
The thleqw command integrates the photon flux absorbed in an edge with
the maximum depth
from the edge energy to the upper energy limit. To get good resolution in the
edge, the command uses the dummyrsp command with the edge energy as low
energy, the upper energy limit as high energy and the bin number for the number
of ranges (see dummyrsp command). The calculation for the edge absorption
is done in the same way as in the edge command. The fluorescent yield
is used to calculate the photon flux going into a fluorescent line emission.
The continuum flux is calculated in the same way as it is in the eqwidth
command. No lines are added to the continuum.
This model assumes a spherically symmetric distribution of absorbing material around the X-ray source with a column density obtained by the wabs model. The defaults are 1.0 keV, 0., .01 keV, 100. keV, 200, and 0.0, which gives 0 for the equivalent width. They are chosen this way since the dummyrsp command defaults are 0.01 keV, 100. keV and 200.
Since the thleqw command uses dummyrsp, the old response must be read in again when working further on the same spectrum.