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| Paper: |
A Reexamination of the `UV Leak' of the High Resolution Imager on ROSAT |
| Volume: |
101, Astronomical Data Analysis Software and Systems V |
| Page: |
120 |
| Authors: |
Silverman, J. D.; Kearns, K.; Harris, D. E. |
| Abstract: |
The `UV Leak' is apparent in observations of Vega which produce an HRI count rate of 0.1 cts/sec whereas a much lower rate is found by the PSPC. This discrepancy led Arp (1995) to interpret extended features adjacent to NGC 1097 (on a `soft' map) as evidence for extragalactic UV emission. We show that the majority of Arp's features are caused by a detector characteristic which produces a slightly higher noise level for PHA 1--3 in a region where the gain is lower, i.e., a higher fraction of background photons produce counts in the lower PHA channels for detector regions with lower gain. |
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