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Effective Area and Energy Resolution vs. Split Event Threshold

The HRMA/ACIS effective area and energy resolution were also evaluated for split event thresholds of 10 to 16 adu in steps of 1 adu.


  
Figure 6.5: Effective Area vs. Energy for ACIS CCD I1 calculated for split event thresholds of 10, 11, 12, 13, 14, 15 and 16ADU  
\begin{figure} % latex2html id marker 8909 \centerline{ \psfig {file=ea_analys... ...berline{\thetable} Effective Area vs.\ Split Threshold for CCD I1 } \end{figure}


  
Figure 6.6: Effective Area vs. Energy for ACIS CCD S3 calculated for split event thresholds of 10, 11, 12, 13, 14, 15 and 16ADU  
\begin{figure} % latex2html id marker 8943 \centerline{ \psfig {file=ea_analys... ...mberline{\thetable} Effective Area vs.\ Split Threshold for CCD S3 }\end{figure}


  
Figure 6.7: Energy Resolution (FWHM) vs. Energy for ACIS CCD I1 calculated for split event thresholds of 10, 11, 12, 13, 14, 15 and 16ADU  
\begin{figure} % latex2html id marker 8977 \centerline{ \psfig {file=ea_analys... ...rline{\thetable} Energy Resolution vs.\ Split Threshold for CCD I1 }\end{figure}


  
Figure 6.8: Energy Resolution (FWHM) vs. Energy for ACIS CCD S3 calculated for split event thresholds of 10, 11, 12, 13, 14, 15 and 16ADU  
\begin{figure} % latex2html id marker 9004 \centerline{ \psfig {file=ea_analys... ...rline{\thetable} Energy Resolution vs.\ Split Threshold for CCD S3 }\end{figure}

Figure 6.5 and figure 6.6 show the dependence of effective area with split event threshold for ACIS CCD's I1 and S3. Tabular versions of the data are listed in Tables 6.12 and  6.13. Figure 6.7 and figure 6.8 show the dependence of energy resolution with split event threshold for ACIS CCD's I1 and S3. Tabular versions of the data are listed in Tables 6.14 and  6.15.

These preliminary results indicate that the HRMA/ACIS effective area and energy resolution do not vary considerably with split event threshold for FI CCD's, whereas the BI chip performance is significantly different, showing a significant dependence on split event threshold.

next up previous contents
Next: ACIS/HRMA Point Spread Function Up: Filtering of ACIS Events Previous: Effective Area and Energy

Mark Bautz
11/20/1997