XRT Temp Response Contributions

Description

• The total temperature response of an XRT channel is a combination of an emission model ("intensity" versus wavelength, as a function of temperature) with the channel effective area (effective collecting area as a function of wavelength).

• The emission model has components of continuum and ion emission lines.

• I used ATOMDB/APEC to calculate the emission models.

• I multiplied the "intensities" by a factor of 1e30 to avoid numerical issues.

• In the plots below, I have separated the XRT temperature response functions into components.
  1. The "continuum" in ATOMDB/APEC is really a psuedo-continuum that contains some few lines in addition to the true continuum.

  2. "Significantly contributing" ion-stages are identified and plotted individually. Their labels on the plots occur just to the upper-right of their peak temperature response. (NB: If an ion-stage has multiple emission lines, then all are included in calculating the ion-stage's net contribution.

  3. The "remainder" is the difference between the total response and the sum of (a) and (b). It represents all lines which are not individually significant.

• Ion-stages are determined to be "significantly contributing" if their individual peak temperature response exceeds a threshold percentage of the total temperature response. For these plots, that threshold is 20%. (NB: It is not difficult to re-identify ion-stages for a different selection of threshold.)

Plots