Letter to the Editor A calibration of the ROSAT HRI UV leak
نویسنده
چکیده
The purpose of this paper is to present a detailed investigation of the Ultraviolet and visible sensitivity of the highresolution imager (HRI) onboard the ROSAT X-ray satellite. We provide observational evidence that a recently published model (Zombeck et al. 1997) of the out-of-band quantum efficiency of the HRI overpredicts the detector response longward of approximately 4000Å. The contamination of the HRI is limited to the UV bandpass below approximately 4000Å. Based on the optical properties of our target stars, our ROSAT HRI and PSPC observations, and UV fluxes measured with the TD1 satellite, we provide an accurate calibration for the UV leak flux and present formulae to estimate UV leak count rates based on UV (1965Å) fluxes or stellar U magnitudes.
منابع مشابه
In-Flight Calibration of the ROSAT HRI UV Sensitivity
Comparing measured and estimated count rates of a few selected sample stars, we connrm the validity and provide the in-ight calibration of the ROSAT HRI UV/Visible eeective area model in Zombeck et al. 1997, ApJ, 487, L69. The count rate estimates for Betelgeuse derived with this model are in agreement with the measured HRI upper limit. This result is also connrmed in an erratum by Berghh ofer ...
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