Abstract
We have performed tests of the SRG project’s ART-XC telescope’s flight spare units of the mirror system (MS) and the URD focal plane X-ray detector. During the tests, the MS was illuminated by a quasi-parallel X-ray beam from a microfocus tube. By changing the angle between the MS optical axis and the incoming beam we obtained data on vignetting of the effective area of the MS–URD pair at the energies of Cu K-lines. The measurements are in good agreement with our model. Using the model vignetting of the effective area, we determined the ART-XC grasp as a function of energy for singly and doubly reflected events. The grasp reaches ∼31 cm2deg2 for singly reflected events at 7.2 keV, ∼44 cm2deg2 for doubly reflected events at 8.6 keV and ∼74 cm2deg2 for the sum of singly and doubly reflected events at 7.6 keV. The grasp values at 8.1 keV are ∼29.9 cm2deg2 for singly reflected events, ∼43.8 cm2deg2 for doubly reflected events and ∼73.7 cm2deg2 for all events. The ART-XC field of view is ∼2 deg2. In its central ∼0.3 deg2, sources are imaged and the instrument works in a “telescope” mode. The outer ∼1.7 deg2 do not have an imaging capability and the instrument works as a “concentrator” there. We also discuss the possibility of using ART-XC for monitoring bright transient X-ray sources when the observatory will be operating in the survey mode.
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Acknowledgements
This work was partly supported by grant 14.W03.31.0021 from the Ministry of Science and Higher Education of the Russian Federation. AT, IL, RK, ASh and SS gratefully acknowledge the support from the Russian Basic Research Foundation’s grant 16-29-13070.
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Pavlinsky, M., Tkachenko, A., Levin, V. et al. On-ground calibration of the ART-XC/SRG mirror system and detector unit at IKI. Part III. Exp Astron 48, 233–244 (2019). https://doi.org/10.1007/s10686-019-09646-8
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DOI: https://doi.org/10.1007/s10686-019-09646-8