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Next: Point Source Sensitivity Up: FEASIBILITY: XMA + HRI Previous: FEASIBILITY: XMA + HRI

General Assumptions

 

In order to estimate the HRI response to a cosmic X-ray source, several performance characteristics of the combined HRI and ROSAT telescope are needed. In the sections that follow we provide estimates of minimum source count rate detection and expected count rates from sources. The assumptions that were used in providing these estimates are:

 

Energy Lambda Effective Energy Lambda Effective
(keV) (Å) Area (cm tex2html_wrap_inline1870 ) (keV) (Å) Area (cm tex2html_wrap_inline1870 )
0.10 124.0 1.0 1.10 11.3 94.5
0.20 62.0 20.2 1.20 10.3 89.7
0.28 44.3 43.5 1.30 9.5 84.7
0.28 44.1 0.0 1.40 8.9 76.1
0.30 41.3 1.0 1.50 8.3 56.5
0.40 31.0 10.6 1.60 7.8 50.0
0.50 24.8 19.3 1.70 7.3 37.2
0.60 20.7 7.6 1.80 6.9 28.0
0.63 19.7 11.9 1.90 6.5 19.4
0.70 17.7 35.5 2.00 6.2 11.2
0.80 15.5 59.9 2.10 5.9 2.7
0.90 13.8 82.6 2.20 5.6 0.6
1.00 12.4 83.2 2.30 5.4 0.4
3.40 5.2 0.2
Table: 11.1   ROSAT XMA+HRI Effective Area

None of these assumptions is absolutely correct, but they provide a typical description of the XMA+HRI performance which may be useful in preparing ROSAT observation proposals.


next up previous contents
Next: Point Source Sensitivity Up: FEASIBILITY: XMA + HRI Previous: FEASIBILITY: XMA + HRI

Michael Arida
Tue Jun 11 16:18:41 EDT 1996